IL-33 ameliorates Alzheimer's disease-like pathology and cognitive decline
Open accessAbstract
Significance: Dysfunction of the innate immune system is involved in the pathogenesis of Alzheimer’s disease (AD); however, the pathophysiological mechanisms underlying these dysfunctions are unclear. Here we report that stimulation of IL-33/ST2 signaling rescues memory deficits and reduces the accumulation of β-amyloid in APP/PS1 mice that exhibit select pathologies associated with AD. Although impaired IL-33/ST2 signaling is associated with early progression of AD, IL-33 injection rescues contextual memory deficits and reduces the accumulation of β-amyloid in APP/PS1 mice. IL-33 skews the microglia toward an alternative activation state with enhanced Aβ phagocytic capacity and elevated antiinflammatory gene expression, which results in a decreased proinflammatory response in the brain. Thus, this study suggests that IL-33 can be developed as a new therapeutic intervention for AD.
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Written from the paper’s full text.
TL;DR
IL-33 administration reversed synaptic plasticity and contextual memory deficits and reduced amyloid pathology in APP/PS1 mice by enhancing microglial Aβ phagocytosis and shifting microglia/macrophages toward an antiinflammatory phenotype. The findings support IL-33/ST2 signaling as a potential therapeutic target in Alzheimer’s disease.
Key findings
- In 6- to 7-mo-old APP/PS1 mice, i.p. IL-33 (200 ng for 2 d) dramatically reversed impaired hippocampal LTP and restored contextual fear memory at 7 d after shock.
- IL-33 reduced soluble Aβ in cortices of 10-mo-old APP/PS1 mice by 54 ± 9% (n = 3 experiments); soluble Aβx-40 and Aβx-42 decreased by ∼50% and ∼30%, respectively. It also reduced 4G8-stained amyloid plaques in 12-mo-old APP/PS1 mice, and intracerebroventricular sST2 abolished this plaque reduction.
- IL-33 increased Aβ phagocytosis: methoxy-X04-labeled Aβ was detected in ∼33% of CD11b+ myeloid cells from APP/PS1 cortices, rising to ∼47% after IL-33; Aβ uptake by resident microglia increased by ∼80%, while infiltrating monocytes remained relatively stable.
- IL-33 increased antiinflammatory Arg1 and Fizz1 mRNA in CD11b+ myeloid cells and suppressed proinflammatory IL-1β, IL-6, and NLRP3 in APP/PS1 cortices; ST2-deficient microglia abolished IL-33-stimulated Aβ uptake.
Methods
- Mouse models: APP/PS1, 5XFAD, and St2−/− mice; WT C57BL/6 controls. In vivo IL-33 was given i.p. at 200 ng per mouse for 2 consecutive days, with some experiments using intracerebroventricular sST2 via osmotic pumps.
- Outcomes included hippocampal LTP at SC-CA1 synapses, open field habituation, contextual fear conditioning, soluble/insoluble Aβ by Western blot and ELISA, 4G8 plaque immunohistochemistry, microglial Aβ phagocytosis by flow cytometry, and inflammatory gene expression by ddPCR/qRT-PCR.
- Human data: serum sST2 measured in 17 healthy controls and 18 patients with MCI (Han Chinese, age ≥60 y), with clinical diagnosis by NINCDS-ADRDA criteria.
Limitations
- The paper does not include a dedicated limitations section; it states that whether IL-33/ST2 suppression of proinflammatory gene production via MyD88 competition mediates the observed effects “awaits further study,” and that further phenotypic characterization of the microglial subset with increased Aβ phagocytic capacity is needed.
- Evident from the text: the therapeutic evidence is primarily from transgenic mouse models, and the human data are limited to cross-sectional serum sST2 in small groups (17 controls, 18 MCI), not IL-33 treatment or clinical outcomes.
- Evident from the text: long-term safety, dosing durability, and whether the murine findings extrapolate to human AD are not established.
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- Findingown data
IL-33 injection increases the proportion of CD11b+ cells exhibiting methoxy-X04 fluorescence to approximately 47% in APP/PS1 mice.
“IL-33 injection further increased the proportion of CD11b + cells exhibiting methoxy-X04 fluorescence (∼47%; Fig. 3 F and G).”
Quote in the paperSubstantial claim - Findingown data
IL-33 administration significantly increases Aβ phagocytic uptake by resident microglia by approximately 80% in APP/PS1 mice.
“IL-33 administration significantly increased Aβ phagocytic uptake by resident microglia by ∼80%, whereas the percentage of Aβ-containing infiltrating monocytes remained relatively stable (Fig. 3 H and I and SI Appendix, Fig. S8 E-G).”
Quote in the paperSubstantial claim - Findingown data
IL-33 administration reduces soluble Aβ x-40 and Aβ x-42 species in the cortices of 10-mo-old APP/PS1 mice.
“Specifically, soluble Aβ x-40 and Aβ x-42 species, which play major synaptotoxic roles in AD (21), were decreased by ∼50% and ∼30%, respectively, in the cortices of 10-mo-old IL-33-administered APP/PS1 mice (Fig. 2B).”
Quote in the paperSubstantial claim - Findingown data§ IL-33 ameliorates Alzheimer's disease-like pathology and cognitive decline
IL-33 administration reduces soluble Aβ levels in the cortices of APP/PS1 mice.
“IL-33 administration reduces soluble Aβ levels and amyloid plaque deposition by promoting the recruitment and Aβ phagocytic activity of microglia; this is mediated by ST2/p38 signaling activation.”
Quote in the paperSubstantial claim - Findingown data
IL-33 administration increases CD68 expression in Iba1+ myeloid cells in close contact with amyloid plaques in APP/PS1 mice.
“IL-33 administration increased CD68 expression in Iba1 + myeloid cells, that were in close contact with amyloid plaques (Fig. 3E).”
Quote in the paperSubstantial claim
- Findingown data§ IL-33 ameliorates Alzheimer's disease-like pathology and cognitive decline
Serum levels of soluble ST2 (sST2) are significantly higher in patients with mild cognitive impairment (MCI) than in healthy controls.
“Serum levels of soluble ST2 (sST2), a decoy receptor for interleukin (IL)-33, increase in patients with mild cognitive impairment, suggesting that impaired IL-33/ST2 signaling may contribute to the pathogenesis of AD.”
- Also stated in: § Results · plain
“We found significantly higher levels of serum sST2, a decoy receptor of IL-33, in patients with mild cognitive impairment (MCI; with an increased risk of developing to AD in later life) compared with healthy controls (Fig. 1A);”
Quote in the paperSubstantial claim - Also stated in: § Results · plain
- Findingown data
IL-33 treatment increases the colocalization of myeloid cells and amyloid plaques in APP/PS1 mouse brains.
“Our 3D analysis confirmed the increased colocalization of myeloid cells and amyloid plaques in IL-33treated APP/PS1 mouse brains (Fig. 3 B and C), supporting the notion that IL-33 enhances the proximity between myeloid cells and amyloid plaques.”
Quote in the paperSubstantial claim - Findingown data§ IL-33 ameliorates Alzheimer's disease-like pathology and cognitive decline
IL-33 administration reverses synaptic plasticity impairment in APP/PS1 mice.
“Here we report that IL-33 administration reverses synaptic plasticity impairment and memory deficits in APP/PS1 mice.”
- Also stated in: § Results · boosted
“An i.p. injection of recombinant IL-33 (200 ng) for 2 d dramatically reversed the LTP impairment of APP/PS1 mice (Fig. 1 B and C).”
Quote in the paperSubstantial claim - Also stated in: § Results · boosted
- Findingown data
IL-33 injection enhances the recruitment of Iba1+ myeloid cells to amyloid plaques in the cortices of APP/PS1 mice.
“IL-33 injection enhanced the recruitment of Iba1 + myeloid cells to amyloid plaques in these cortices (Fig. 3A).”
Quote in the paperSubstantial claim - Findingown data§ IL-33 ameliorates Alzheimer's disease-like pathology and cognitive decline
IL-33 administration reverses memory deficits in APP/PS1 mice.
“Here we report that IL-33 administration reverses synaptic plasticity impairment and memory deficits in APP/PS1 mice.”
- Also stated in: § Results · plain
“IL-33 treatment was able to restore the impaired freezing response of the APP/PS1 mice at 7 d after the electric shock (Fig. 1G).”
- Also stated in: § Results · boosted
“Collectively, these results demonstrate that IL-33 can rescue the synaptic dysfunction and memory deficits of APP/PS1 mice.”
Quote in the paperSubstantial claim - Also stated in: § Results · plain
- Findingown data
Methoxy-X04-labeled Aβ is detected in approximately 33% of CD11b+ myeloid cells from the cortices of APP/PS1 mice.
“Flow cytometry analysis detected methoxy-X04-labeled Aβ in ∼33% of the CD11b + myeloid cells from the cortices of the APP/PS1 mice (Fig. 3 F and G), but not those of WT mice (SI Appendix, Fig. S7).”
Quote in the paperSubstantial claim - Findingown data
IL-33 administration reduces 4G8-stained amyloid plaques in 5XFAD mice.
“IL-33 administration for 2 d also reduced 4G8-stained amyloid plaques in 5XFAD mice, another AD transgenic mouse model (SI Appendix, Fig. S6).”
Quote in the paperSubstantial claim - Findingown data§ IL-33 ameliorates Alzheimer's disease-like pathology and cognitive decline
IL-33 administration reduces amyloid plaque deposition in APP/PS1 mice.
“IL-33 administration reduces soluble Aβ levels and amyloid plaque deposition by promoting the recruitment and Aβ phagocytic activity of microglia; this is mediated by ST2/p38 signaling activation.”
- Also stated in: § Results · plain
“At 2 d after IL-33 treatment, the 4G8-labeled amyloid plaques were significantly reduced in the cortices of 12-mo-old APP/PS1 mice (Fig. 2 C and D).”
Quote in the paperSubstantial claim - Also stated in: § Results · plain
- Findingown data
APP/PS1 mice exhibit approximately 3.6-fold more infiltrating monocytes (CD11b+ CD45hi myeloid cells) than WT mice.
“The APP/PS1 mice exhibited ∼3.6-fold more infiltrating mono- cytes (CD11b + CD45 hi myeloid cells) compared with the WT mice (SI Appendix, Fig. S8 A-D).”
Quote in the paperSubstantial claim - Findingown data
Intracerebroventricular administration of sST2 abolishes the IL-33-mediated reduction of 4G8-stained amyloid plaques in APP/PS1 mice.
“Importantly, intracerebroventricular administration of sST2 abolished the IL-33-mediated reduction of 4G8-stained amyloid plaques in the APP/PS1 mice (Fig. 2 C and D), demonstrating the specificity and the central activation of myeloid cells of IL-33/ST2 signaling in ameliorating the cerebral amyloid pathology.”
Quote in the paperSubstantial claim - Findingown data
In APP/PS1 mice, approximately 80% of CD11b+ CD45hi infiltrating monocytes take up methoxy-X04-labeled Aβ.
“In the APP/PS1 mice, ∼10% of CD11b + CD45 lo resident microglia phagocytosed Aβ (Fig. 3 H and I), and ∼80% of CD11b + CD45 hi infiltrating monocytes took up the methoxy-X04-labeled Aβ (SI Appendix, Fig. S8 E-G).”
Quote in the paperNot a substantial claim - Findingown data
In APP/PS1 mice, approximately 10% of CD11b+ CD45lo resident microglia phagocytose Aβ.
“In the APP/PS1 mice, ∼10% of CD11b + CD45 lo resident microglia phagocytosed Aβ (Fig. 3 H and I), and ∼80% of CD11b + CD45 hi infiltrating monocytes took up the methoxy-X04-labeled Aβ (SI Appendix, Fig. S8 E-G).”
Quote in the paperSubstantial claim - Findingown data
Serum sST2 levels differ significantly between healthy control subjects (n = 17) and patients with MCI (n = 18).
“Boxplot showing the sST2 levels in the serum of healthy subjects (NC; n = 17) and patients with MCI (n = 18).*P < 0.05, two-sample t test.”
Quote in the paperNot a substantial claim - Findingown data
IL-33 enhances the uptake of fluorescence-labeled oligomeric Aβ1-42 in cultured microglial cells from WT mice in a dose-dependent manner.
“IL-33 enhanced the uptake of fluorescence-labeled oligomeric Aβ 1-42 in cultured microglial cells in WT mice in a dose-dependent manner (SI Appendix, Fig. S10), but not in ST2-deficient microglia (Fig. 4C).”
Quote in the paperSubstantial claim - Findingown data
ST2-deficient microglia abolish IL-33-stimulated Aβ uptake.
“(C) ST2-deficient microglia abolished the IL-33stimulated Aβ uptake.”
Quote in the paperSubstantial claim - Findingown data
IL-33 increases the percentage of CD11b+ mononuclear cells containing methoxy-X04-labeled Aβ in APP/PS1 mouse brains at 17 months of age.
“Representative scatterplots and quantification show the percentages of CD11b + mononuclear cells (F and G) and CD11b + CD45 lo cells (H and I) containing methoxy-X04-labeled Aβ in the APP/PS1 mouse brains (17 mo old) after IL-33 administration.”
Quote in the paperSubstantial claim - Findingown data
IL-33 increases CD68 expression in Aβ plaques.
“(D and E) IL-33 increases CD68 expression in Aβ plaques.”
Quote in the paperSubstantial claim - Findingown data
IL-33 administration increases neprilysin protein level in the brains of APP/PS1 mice at 14 months of age.
“(A and B) IL-33 administration increases neprilysin protein level in the brains of APP/PS1 mice.”
Quote in the paperSubstantial claim - Findingown data
APP/PS1 mice exhibit significantly slower habituation to the testing environment than WT mice.
“The APP/PS1 mice exhibited significantly slower habituation to the testing environment than the WT mice; however, the IL-33-treated APP/PS1 mice showed significantly improved habituation to the testing environment (Fig. 1D and SI Appendix, Fig. S1).”
Quote in the paperSubstantial claim - Findingown data
In APP/PS1 mice, proinflammatory genes including IL-1β, IL-6, and NLRP3 are significantly induced in the brain cortex.
“In the APP/PS1 mice, proinflammatory genes including IL-1β, IL-6, and NLRP3 (NOD-like receptor family, pyrin domain-containing 3, a key component in the inflammasome cascade) were significantly induced in the brain cortex.”
Quote in the paperSubstantial claim - Findingown data
IL-33 increases the percentage of CD11b+CD45lo cells containing methoxy-X04-labeled Aβ in APP/PS1 mouse brains at 17 months of age.
“Representative scatterplots and quantification show the percentages of CD11b + mononuclear cells (F and G) and CD11b + CD45 lo cells (H and I) containing methoxy-X04-labeled Aβ in the APP/PS1 mouse brains (17 mo old) after IL-33 administration.”
Quote in the paperSubstantial claim - Findingcitation
LTP is significantly impaired in 6- to 7-mo-old APP/PS1 mice.
“Whereas high-frequency stimulation significantly increased the magnitude of long-term potentiation (LTP) at Schaffer collateral (SC)-CA1 synapses in the hippocampus of wild type (WT) mice, LTP was significantly impaired in 6-to 7-mo-old APP/PS1 mice (17,18).”
Quote in the paperSubstantial claim0 of 2 sources checked - Findingown data
IL-33 administration reduces Aβ plaques in APP/PS1 mice.
“IL-33 administration reduces soluble Aβ levels and Aβ plaques in APP/PS1 mice.”
- Also stated in: § Statistical Analysis. · plain
“(C and D) IL-33 ameliorated amyloid plaque pathology in APP/PS1 mice.”
Quote in the paperSubstantial claim - Also stated in: § Statistical Analysis. · plain
- Findingown data
IL-33 treatment restores the impaired freezing response of APP/PS1 mice at 7 d after electric shock.
“Whereas the IL-33-treated APP/PS1 mice did not exhibit an improvement in freezing performance 1 d after the electric shock (Fig. 1F), IL-33 treatment was able to restore the impaired freezing response of the APP/PS1 mice at 7 d after the electric shock (Fig. 1G).”
Quote in the paperSubstantial claim - Findingown data
IL-33 administration increases mRNA expression of Arg1 and Fizz1 in CD11b+ myeloid cells isolated from both WT and APP/PS1 mouse brains.
“Importantly, the mRNA expression of Arg1 and Fizz1, which are associated with antiinflammatory action, was significantly increased in CD11b + myeloid cells isolated from both WT and APP/PS1 mouse brains after IL-33 administration (Fig. 4 D and E).”
Quote in the paperSubstantial claim - Findingown data
IL-33-treated APP/PS1 mice do not exhibit improvement in freezing performance 1 d after electric shock.
“Whereas the IL-33-treated APP/PS1 mice did not exhibit an improvement in freezing performance 1 d after the electric shock (Fig. 1F), IL-33 treatment was able to restore the impaired freezing response of the APP/PS1 mice at 7 d after the electric shock (Fig. 1G).”
Quote in the paperNot a substantial claim - Findingown data
IL-33 increases the colocalization of Iba1+ myeloid cells and Aβ plaques in the cortices of APP/PS1 mice at 12 months of age.
“(A-C) IL-33 increases the colocalization of Iba1 + myeloid cells and Aβ plaques in the cortices of APP/PS1 mice (12 mo old).”
Quote in the paperSubstantial claim - Findingown data
IL-33 administration reduces soluble Aβ levels in APP/PS1 mice.
“IL-33 administration reduces soluble Aβ levels and Aβ plaques in APP/PS1 mice.”
- Also stated in: § Statistical Analysis. · plain
“(A) IL-33 reduced soluble Aβ content.”
Quote in the paperSubstantial claim - Also stated in: § Statistical Analysis. · plain
- Findingown data
IL-33-treated APP/PS1 mice show significantly improved habituation to the testing environment.
“The APP/PS1 mice exhibited significantly slower habituation to the testing environment than the WT mice; however, the IL-33-treated APP/PS1 mice showed significantly improved habituation to the testing environment (Fig. 1D and SI Appendix, Fig. S1).”
Quote in the paperSubstantial claim - Findingown data
IL-33 administration significantly suppresses the increased expression of proinflammatory genes IL-1β, IL-6, and NLRP3 in the brain cortex of APP/PS1 mice.
“IL-33 administration significantly suppressed the increased expression of these proinflammatory genes (Fig. 4 F-H).”
Quote in the paperSubstantial claim - Findingown data
IL-33 administration does not significantly change the percentage of Aβ-containing infiltrating monocytes in APP/PS1 mice.
“IL-33 administration significantly increased Aβ phagocytic uptake by resident microglia by ∼80%, whereas the percentage of Aβ-containing infiltrating monocytes remained relatively stable (Fig. 3 H and I and SI Appendix, Fig. S8 E-G).”
Quote in the paperNot a substantial claim - Findingown data
ST2 downstream signaling molecules p38 and ERK1/2 MAPKs are activated in cultured microglia on IL-33 treatment.
“Concordant with the prominent expression of ST2 in microglia (SI Appendix, Fig. S11A), the downstream signaling molecules (p38 and ERK1/2 MAPKs) of ST2 receptors were activated in cultured microglia on IL-33 treatment (SI Appendix, Fig. S11 B-D).”
Quote in the paperSubstantial claim - Findingown data
IL-33 reaches the brain within 30 min after i.p. injection.
“IL-33 reached the brain within 30 min after i.p. injection (SI Appendix, Fig. S3), consistent with earlier findings of a compromised blood-brain barrier in both APP/PS1 mice and patients with AD (19,20).”
Quote in the paperSubstantial claim - Findingown data
APP/PS1 mice exhibit reduced freezing behavior at 1 d and 7 d after electric shock, indicating impaired contextual retrieval of fear memory.
“Compared with the WT mice, the APP/PS1 mice exhibited reduced freezing behavior at 1 d and 7 d after the electric shock, indicating an impaired contextual retrieval of fear memory (Fig. 1 F and G).”
Quote in the paperSubstantial claim - Findingown data
IL-33-treated APP/PS1 mice at 14 months of age exhibit improved habituation in the exploratory open field test.
“(D) IL-33-treated APP/PS1 mice (14 mo old) exhibit improved habituation in the exploratory open field (OF) test.”
Quote in the paperSubstantial claim - Findingown data
IL-33 does not enhance the uptake of fluorescence-labeled oligomeric Aβ1-42 in ST2-deficient microglia.
“IL-33 enhanced the uptake of fluorescence-labeled oligomeric Aβ 1-42 in cultured microglial cells in WT mice in a dose-dependent manner (SI Appendix, Fig. S10), but not in ST2-deficient microglia (Fig. 4C).”
Quote in the paperSubstantial claim - Findingown data
sST2 is increased in the serum of patients with MCI.
“IL-33 expression is reduced in the brains of patients with AD (15), and sST2 is increased in the serum of patients with MCI, as demonstrated in the present study (Fig. 1A).”
Quote in the paperSubstantial claim - Findingown data
APP/PS1 mutant mice at 6 to 7 months of age exhibit impaired LTP in the hippocampal CA1 region.
“IL-33 rescues LTP impairment in APP/PS1 mutant mice.”
Quote in the paperSubstantial claim - Interpretationreasoning§ IL-33 ameliorates Alzheimer's disease-like pathology and cognitive decline
Impaired IL-33/ST2 signaling may contribute to the pathogenesis of AD.
“Serum levels of soluble ST2 (sST2), a decoy receptor for interleukin (IL)-33, increase in patients with mild cognitive impairment, suggesting that impaired IL-33/ST2 signaling may contribute to the pathogenesis of AD.”
Quote in the paperSubstantial claim- Rests on an assumption: The mechanisms underlying the onset and progression of AD remain unclear.
- Interpretationown data
IL-33/ST2 signaling in myeloid cells specifically mediates the amelioration of cerebral amyloid pathology.
“Importantly, intracerebroventricular administration of sST2 abolished the IL-33-mediated reduction of 4G8-stained amyloid plaques in the APP/PS1 mice (Fig. 2 C and D), demonstrating the specificity and the central activation of myeloid cells of IL-33/ST2 signaling in ameliorating the cerebral amyloid pathology.”
Quote in the paperSubstantial claim - Interpretationown data
IL-33 administration increases phagocytic Aβ uptake by myeloid cells.
“These findings suggest that IL-33 administration increases phagocytic Aβ uptake by myeloid cells.”
Quote in the paperSubstantial claim - Interpretationown data
Peripheral IL-33 administration in AD mouse models alleviates AD-like pathology by enhancing microglial phagocytosis and degradation of Aβ.
“The present study demonstrates that peripheral IL-33 administration in AD mouse models alleviates AD-like pathology by enhancing microglial phagocytosis and degradation of Aβ.”
Quote in the paperSubstantial claim - Interpretationown data
IL-33 regulates inflammatory responses in the APP/PS1 mouse brain.
“Taken together, these findings suggest that IL-33 regulates inflammatory responses in the APP/PS1 mouse brain.”
Quote in the paperSubstantial claim - Interpretationown data
IL-33 enhances the proximity between myeloid cells and amyloid plaques.
“Our 3D analysis confirmed the increased colocalization of myeloid cells and amyloid plaques in IL-33treated APP/PS1 mouse brains (Fig. 3 B and C), supporting the notion that IL-33 enhances the proximity between myeloid cells and amyloid plaques.”
Quote in the paperSubstantial claim - Interpretationown data
IL-33 drives microglia/macrophages in APP/PS1 mouse brains toward an alternative activation phenotype.
“These results suggest that IL-33 drives the microglia/macrophages in the APP/PS1 mouse brains toward an alternative activation phenotype, which may contribute to neuroprotective functions.”
- Also stated in: § Discussion · hedged
“Indeed, we show that IL-33 administration causes an increase in the antiinflammatory genes Arg1 and Fizz1 in microglia/macrophages in the brain, suggesting that IL-33 enhances the polarization of microglia/ macrophages to an alternative activation phenotype.”
Quote in the paperSubstantial claim - Also stated in: § Discussion · hedged
- Interpretationreasoning
IL-33 administration can be developed as a potential therapeutic intervention for AD.
“Considered along with the beneficial effects of IL-33 on synaptic and memory functions in the AD-like mouse model, our results suggest that IL-33 administration can be developed as a potential therapeutic intervention for AD.”
Quote in the paperSubstantial claim- Rests on an assumption: There is no effective therapy for AD.
- Rests on an assumption: The mechanisms underlying the onset and progression of AD remain unclear.
- Interpretationown data
IL-33-dependent activation of ST2 signaling in microglia enhances Aβ phagocytosis and clearance.
“These findings suggest that IL-33-dependent activation of ST2 signaling in microglia enhances Aβ phagocytosis and clearance.”
Quote in the paperSubstantial claim - Interpretationown data
The increase of neprilysin protein in the brains of APP/PS1 mice after IL-33 administration provides insight into the mechanism of enzymatic degradation of Aβ in the IL-33-treated condition.
“The increase of neprilysin protein in the brains of APP/PS1 mice after IL-33 administration (Fig. 4 A and B) provides insight into the mechanism of the enzymatic degradation of Aβ in the IL-33-treated condition.”
Quote in the paperSubstantial claim - Interpretationown data
IL-33 drives microglia to an alternative activation state in APP/PS1 mice.
“(D and E) IL-33 drives microglia to an alternative activation state in APP/PS1 mice.”
Quote in the paperSubstantial claim - Interpretationown data
ST2 signaling in microglia mediates the IL-33-associated enhancement of Aβ phagocytosis in the brain of APP/PS1 mice.
“These results indicate that ST2 signaling in microglia mediates the IL-33-associated enhancement of Aβ phagocytosis in the brain of APP/PS1 mice.”
Quote in the paperSubstantial claim - Interpretationown data
IL-33 administration enhances microglial phagocytosis of Aβ.
“IL-33 administration enhances microglial phagocytosis of Aβ.”
- Also stated in: § Statistical Analysis. · plain
“(F-I) IL-33 enhances the phagocytic activity of resident microglial cells.”
Quote in the paperSubstantial claim - Also stated in: § Statistical Analysis. · plain
- Premisecitation
IL-33 expression is reduced in the brains of patients with AD.
“IL-33 expression is reduced in the brains of patients with AD (15), and sST2 is increased in the serum of patients with MCI, as demonstrated in the present study (Fig. 1A).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [15] source
Not checked in the free run.
- Interpretationcitation
Observations in the murine AD model could be extrapolated to humans.
“Indeed, genetic studies have linked IL-33/ST2 single nucleotide polymorphisms to clinical AD (15,51), suggesting that our observations in the murine AD model could be extrapolated to humans.”
Quote in the paperSubstantial claim0 of 2 sources checked - Interpretationown data
IL-33 modulates inflammatory responses in APP/PS1 mice.
“IL-33 modulates inflammatory responses in APP/PS1 mice.”
Quote in the paperSubstantial claim - Interpretationown data
IL-33 specifically enhances Aβ uptake by microglia.
“IL-33 specifically enhances Aβ uptake by microglia.”
Quote in the paperSubstantial claim - Interpretationown data
IL-33 mobilizes innate immunity to prevent and clear established Aβ accumulation even at late stages of the disease.
“Our finding that IL-33 mobilizes innate immunity to prevent and clear established Aβ accumulation even at late stages of the disease represents a new treatment paradigm for AD.”
Quote in the paperSubstantial claim
- The quote only partly states this claim. 3
- May combine two claims. 6
- Classified as probably not a substantial claim. 2
The quote only partly states this claim.
Findingown dataIL-33 administration rescues LTP impairment in APP/PS1 mutant mice at 6 to 7 months of age in the hippocampal CA1 region.
“IL-33 rescues LTP impairment in APP/PS1 mutant mice.”
Quote in the paperSubstantial claimThe quote only partly states this claim.
Findingown dataIL-33 ameliorates memory retrieval deficits of APP/PS1 mice in fear conditioning tests at 1 day after electric shock.
“IL-33 ameliorates memory retrieval deficits of APP/PS1 mice in fear conditioning (FC) tests.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataAt the concentration used (200 ng i.p. daily for 2 d), IL-33 does not affect general health or plasma histamine level in WT or APP/PS1 mice.
“At the concentration used (200 ng i.p. daily for 2 d), IL-33 did not affect the general health or plasma histamine level in either WT or APP/PS1 mice (SI Appendix, Fig. S4).”
Quote in the paperNot a substantial claimThe quote only partly states this claim.
Findingown dataIL-33 ameliorates memory retrieval deficits of APP/PS1 mice in fear conditioning tests at 7 days after electric shock.
“IL-33 ameliorates memory retrieval deficits of APP/PS1 mice in fear conditioning (FC) tests.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataIL-33 administration mitigates amyloid plaque pathology in APP/PS1 mice through enhancement of Aβ phagocytosis by resident microglia and Aβ clearance, probably by increasing neprilysin levels.
“Taken together, our results demonstrate that IL-33 administration mitigates the amyloid plaque pathology in APP/PS1 mice through the enhancement of Aβ phagocytosis by resident microglia and Aβ clearance, probably by increasing neprilysin levels.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
Study design and conductnone givenInvestigators who performed the electrophysiological, immunohistochemical, RNA expression, and flow cytometry analyses and the behavioral tests were blinded to the genotypes of the mice and treatment conditions.
“The investigators who performed the electrophysiological, immunohistochemical, RNA expression, and flow cytometry analyses and the behavioral tests were blinded to the genotypes of the mice and treatment conditions.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataIL-33 administration ameliorates synaptic impairment and behavioral deficits in APP/PS1 mice.
“IL-33 administration ameliorates synaptic impairment and behavioral deficits in APP/PS1 mice.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataIL-33 treatment reverses contextual memory deficits in APP/PS1 mice, probably through ameliorating hippocampal synaptic dysfunctions.
“These data suggest that IL-33 treatment reverses contextual memory deficits in APP/PS1 mice, probably through ameliorating the hippocampal synaptic dysfunctions.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataIL-33 administration reduces soluble Aβ levels and Aβ plaques in APP/PS1 mice.
“IL-33 administration reduces soluble Aβ levels and Aβ plaques in APP/PS1 mice.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataThe purity of microglia/infiltrating monocyte isolation was routinely greater than 90%, as determined by fluorescence staining for CD11b and flow cytometry analysis.
“The purity of microglia/infiltrating monocyte isolation was routinely >90% as determined by fluorescence staining for CD11b and flow cytometry analysis.”
Quote in the paperNot a substantial claimMay combine two claims.
Interpretationown dataIL-33 treatment switches microglia/macrophages to an alternative activation phenotype, resulting in a reduction of the proinflammatory response in AD mouse brains.
“Furthermore, IL-33 treatment switches the microglia/macrophages to an alternative activation phenotype, resulting in a reduction of the proinflammatory response in the AD mouse brains.”
Quote in the paperSubstantial claim
The paper relies on this without support.
There is no effective therapy for AD.
“There is no effective therapy for AD, in part because of our limited knowledge of its underlying pathophysiological mechanisms.”
The paper relies on this without support.
The mechanisms underlying the onset and progression of AD remain unclear.
“The mechanisms underlying the onset and progression of AD remain unclear.”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
The authors' results support previous studies showing improved behaviour in AD mouse models associated with enhanced microglial amyloid plaque phagocytosis in response to scanning ultrasound and treatment with IL-33.
“Our results support previous studies showing improved behaviour in AD mouse models associated with enhanced microglial amyloid plaque phagocytosis in response to scanning ultrasound69, and treatment with IL-33 that signals exclusively via MyD8870.”
From Transcriptional signature in microglia associated with Aβ plaque phagocytosis (2021) · cites this paper as [70]
The paper reports that IL-33 treatment reverses cognitive deficits in APP/PS1 mice and enhances microglial Aβ phagocytosis (introductory summary and Results, Fig. 3). Its Discussion says ST2 activation recruits MyD88, but does not establish that IL-33 signals exclusively through MyD88. The scanning-ultrasound finding is attached to a different citation and is not assessed here. (LLM, conf=0.86)
Experimental — accuracy not yet measuredCD45 is differentially expressed on microglia (CD45lo/CD11b+) and recruited myeloid cells (CD45hi/CD11b+), and this distinction is commonly used in flow cytometry to distinguish recruited myeloid cells from resident microglia in various disease states.
“CD45 is differentially expressed on microglia (CD45lo/CD11b+) and recruited myeloid cells (CD45hi/CD11b+), and this distinction is commonly used in flow cytometry experiments to distinguish recruited myeloid cells from resident microglia in various disease states [27, 40, 41].”
From IL-1β-driven amyloid plaque clearance is associated with an expansion of transcriptionally reprogrammed microglia (2019) · cites this paper as [27]
Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measuredIL-33 administration ameliorated memory deficits and reduced Aβ deposition in the APP/PS1 mouse model.
“Furthermore, IL-33 administration ameliorated memory deficits and reduced Aβ deposition in the APP/PS1 mouse model (54).”
From The effect of Abi3 locus deletion on the progression of Alzheimer’s disease-related pathologies (2023) · cites this paper as [54]
Activation of microglial cells by inflammatory molecules has been shown to enhance Aβ clearance by microglia.
“Strikingly, activation of microglial cells by inflammatory molecules has been shown to enhance Aβ clearance by microglia [3, 26, 27].”
From IL-1β-driven amyloid plaque clearance is associated with an expansion of transcriptionally reprogrammed microglia (2019) · cites this paper as [27]
IL-33 ameliorated AD-associated phenotypes by promoting anti-inflammatory functions, which included induction of Arg1.
“IL-33 ameliorated AD-associated phenotypes by promoting anti-inflammatory functions, which included induction of Arg1 (80).”
From <i>Trem2</i> promotes anti-inflammatory responses in microglia and is suppressed under pro-inflammatory conditions (2020) · cites this paper as [80]
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The role of the immune system in Alzheimer disease: Etiology and treatment
Jevtic, S. D., Sengar, A. S., Salter, M. W., & McLaurin, J. (2017) · Ageing Research Reviews · doi:10.1016/j.arr.2017.08.005 · Cited by 218 · see citing works
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“ARG1-positive microglia have been shown to modify Aβ accumulation (79), and IL-33 ameliorated AD-associated phenotypes by promoting anti-inflammatory functions, which included induction of Arg1 (80).”
BackgroundDing, B., Lin, C., Liu, Q., He, Y., Ruganzu, J. B., Jin, H., Peng, X., Ji, S., Ma, Y., & Yang, W. (2020) · Journal of Neuroinflammation · doi:10.1186/s12974-020-01981-4 · Cited by 208 · see citing works
“Activated microglia and astrocytes stimulated by Aβ play an important role in the release of pro-inflammatory chemokines and cytokines, which can lead to an increase in Aβ production, neuronal damage, and cognitive deficits [35].”
BackgroundWu, A., Zhou, X., Qiao, G., Yu, L., Tang, Y., Yan, L., Qiu, W., Pan, R., Yu, C., Law, B. Y. K., et al. (2020) · Ageing Research Reviews · doi:10.1016/j.arr.2020.101202 · Cited by 193 · see citing works
Self-citationTREM2 dependent and independent functions of microglia in Alzheimer’s disease
Hou, J., Chen, Y., Grajales-Reyes, G., & Colonna, M. (2022) · Molecular Neurodegeneration · doi:10.1186/s13024-022-00588-y · Cited by 191 · see citing works
Liu, Y., Shen, X. P., Zhang, Y., Zheng, X., Cepeda, C., Wang, Y., Duan, S., & Tong, X. (2023) · Glia · doi:10.1002/glia.24343 · Cited by 190 · see citing works
“However, the activation of microglia, either by LPS injections or in other neurodevelopmental and psychiatric disorders, causes exacerbated synaptic activities, leading to deficits in learning and cognition in AD (Fu et al., 2016; Kim et al., 2017; Li et al., 2021; Zuckerman et al., 2018).”
BackgroundExploiting microglial and peripheral immune cell crosstalk to treat Alzheimer’s disease
Dionisio-Santos, D. A., Olschowka, J. A., & O’Banion, M. K. (2019) · Journal of Neuroinflammation · doi:10.1186/s12974-019-1453-0 · Cited by 184 · see citing works
“IL-33 levels are low in the brains of AD patients, and serum levels of soluble ST2, the IL-33 receptor, are high in the brains of patients with mild cognitive impairment [179, 180].”
BackgroundYe, X., Zhu, M., Che, X., Wang, H., Liang, X., Wu, C., Xue, X., & Yang, J. (2020) · Journal of Neuroinflammation · doi:10.1186/s12974-019-1644-8 · Cited by 184 · see citing works
Targeting neuroinflammation in Alzheimer’s disease: from mechanisms to clinical applications
Si, Z.-Z., Zou, C.-J., Mei, X., Mei, X., Luo, H., Shen, Y., Hu, J., Li, X.-X., Wu, L., & Liu, Y. (2022) · Neural Regeneration Research · doi:10.4103/1673-5374.353484 · Cited by 192 · see citing works
“Cytokines and Immune Signaling in Alzheimer’s Disease Over the years, many natural immune cytokines, such as tumor necrosis factor-α (TNF-α), interleukin (IL)-10, IL-12, IL-18, IL-23, IL-33, IL-34, IL-1β, and type I interferon, have been suggested to be tightly related to diverse AD processes (Mizuno et al., 2011; Bha…”
BackgroundXu, J., Chen, Z., Yu, F., Liu, H., Ma, C., Xie, D., Hu, X., Leak, R. K., Chou, S. H. Y., Stetler, R. A., et al. (2020) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2018497117 · Cited by 180 · see citing works
“IL-33 also enhances microglial clearance of β-amyloid by activating the ST2/p38 signaling, reducing cerebral inflammation and rescuing memory deficits in Alzheimer’s disease models (38).”
BackgroundRider, P., Voronov, E., Dinarello, C. A., Apte, R. N., & Cohen, I. (2017) · The Journal of Immunology · doi:10.4049/jimmunol.1601342 · Cited by 178 · see citing works
“Although the reports of novel alarmins or stressorins and their function in immune activation are rapidly on the rise, uncovering the full potential of their inhibition as a new therapeutic approach will require extensive study of the intracellular pathways leading to their release and inactivation under different phy…”
BackgroundOzone exposure induces respiratory barrier biphasic injury and inflammation controlled by IL-33
Michaudel, C., Mackowiak, C., Maillet, I., Fauconnier, L., Akdiş, C. A., Sokołowska, M., Dreher, A., Tan, H. T., Quesniaux, V. F. J., Ryffel, B., et al. (2018) · Journal of Allergy and Clinical Immunology · doi:10.1016/j.jaci.2017.11.044 · Cited by 172 · see citing works
Neuroinflammation, gut microbiome, and Alzheimer's disease
Lin, L., Zheng, L. J., & Zhang, L. J. (2018) · Molecular Neurobiology · doi:10.1007/s12035-018-0983-2 · Cited by 147 · see citing works
Italiani, P., Puxeddu, I., Napoletano, S., Scala, E., Melillo, D., Manocchio, S., Angiolillo, A., Migliorini, P., Boraschi, D., Vitale, E., et al. (2018) · Journal of Neuroinflammation · doi:10.1186/s12974-018-1376-1 · Cited by 149 · see citing works
Astrocyte-secreted IL-33 mediates homeostatic synaptic plasticity in the adult hippocampus
Wang, Y., Fu, W., Cheung, K., Hung, K.-W., Chen, C., Geng, H.-Y., Yung, W., Qu, J. Y., Fu, A. K. Y., & Ip, N. Y. (2020) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2020810118 · Cited by 135 · see citing works
“It has been reported that Alzheimer’s disease patients also exhibited decreased IL-33 transcript levels in the brain and impaired IL-33/ST2 signaling (37, 80).”
BackgroundResultSelf-citationFu, W., Wang, X., & Ip, N. Y. (2018) · ACS Chemical Neuroscience · doi:10.1021/acschemneuro.8b00402 · Cited by 136 · see citing works
Self-citationThe IL-1 family cytokines and receptors in autoimmune diseases
Migliorini, P., Italiani, P., Pratesi, F., Puxeddu, I., & Boraschi, D. (2020) · Autoimmunity Reviews · doi:10.1016/j.autrev.2020.102617 · Cited by 134 · see citing works
The immune system and psychiatric disease: a basic science perspective
Bennett, F. C., & Molofsky, A. V. (2019) · Clinical & Experimental Immunology · doi:10.1111/cei.13334 · Cited by 133 · see citing works
Piirainen, S., Youssef, A. M., Song, C., Kalueff, A. V., Landreth, G. E., Malm, T., & Tian, L. (2017) · Neuroscience & Biobehavioral Reviews · doi:10.1016/j.neubiorev.2017.01.046 · Cited by 125 · see citing works
IL-33 exacerbates liver sterile inflammation by amplifying neutrophil extracellular trap formation
Yazdani, H. O., Chen, H., Tohme, S. T., Tai, S., van der Windt, D. J., Loughran, P., Rosborough, B. R., Sud, V., Beer–Stolz, D., Turnquist, H. R., et al. (2017) · Journal of Hepatology · doi:10.1016/j.jhep.2017.09.010 · Cited by 127 · see citing works
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“For instance, p38 MAPK protein has been linked with microglial response by directly promoting the expression of inflammatory cytokine such as TNF-α, IL6 or IL-1β via TLR’s ligands or in the presence of Aβ37.”
IL-1 family cytokines in inflammation and immunity
Garlanda, C., Ceglie, I. D., & Jaillon, S. (2025) · Cellular and Molecular Immunology · doi:10.1038/s41423-025-01358-8 · Cited by 143 · see citing works
“In AD animal models, IL-33 expression has been associated with reduced disease pathology, whereas increased IL-33 plasma levels have been observed in patients treated with the neuroprotective compound homotaurine [247, 248].”
IL-33 improves wound healing through enhanced M2 macrophage polarization in diabetic mice.
He, R., Yin, H., Yuan, B., Liu, T., Luo, L., Huang, P., Dai, L., & Zeng, K. (2017) · Molecular Immunology · doi:10.1016/j.molimm.2017.06.249 · Cited by 111 · see citing works
“…variety of studies that IL-33, known as an inducer of Th2type immune response, exhibits a central role in the treatment of situations such as stroke, transplantation, experimental autoimmune uveitis and Alzheimer's disease (Luo et al., 2015; Yin et al., 2010; Barbour et al., 2014; Fu et al., 2016).”
BackgroundSynaptic Elimination in Neurological Disorders
Cardozo, P. L., de Lima, I. B. Q., Maciel, E. M. A., Silva, N. C., Dobránsky, T., & Ribeiro, F. M. (2019) · Current Neuropharmacology · doi:10.2174/1570159x17666190603170511 · Cited by 113 · see citing works
The role of innate immunity in Alzheimer's disease
Ennerfelt, H. E., & Lukens, J. R. (2020) · Immunological Reviews · doi:10.1111/imr.12896 · Cited by 121 · see citing works
Male-specific IL-33 expression regulates sex-dimorphic EAE susceptibility
Russi, A. E., Ebel, M. E., Yang, Y., & Brown, M. A. (2018) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1710401115 · Cited by 117 · see citing works
Lau, S.-F., Chen, C., Fu, W.-Y., Qu, J. Y., Cheung, T. H., Fu, A. K. Y., & Ip, N. Y. (2020) · Cell Reports · doi:10.1016/j.celrep.2020.107530 · Cited by 114 · see citing works
“IL-33 Enhances the Chemotactic Response of a Microglial Subpopulation toward AbPlaques in APP/PS1 Mice IL-33 injection enhances the co-localization of microglia with Ab plaques and promotes Ab clearance (Fu et al., 2016).”
BackgroundInfluentialSelf-citationPharmacological approaches to mitigate neuroinflammation in Alzheimer’s disease
Uddin, M. S., Kabir, M. T., Mamun, A. A., Barreto, G. E., Rashid, M., Perveen, A., & Ashraf, G. M. (2020) · International Immunopharmacology · doi:10.1016/j.intimp.2020.106479 · Cited by 115 · see citing works
Ruganzu, J. B., Zheng, Q., Wu, X., He, Y., Peng, X., Jin, H., Zhou, J., Ma, R., Ji, S., Ma, Y., et al. (2020) · Experimental Neurology · doi:10.1016/j.expneurol.2020.113506 · Cited by 115 · see citing works
Kempuraj, D., Selvakumar, G. P., Thangavel, R., Ahmed, M. E., Zaheer, S. A., Raikwar, S. P., Iyer, S. S., Bhagavan, S., Ramaswamy, S. B., & Zaheer, A. (2017) · Frontiers in Neuroscience · doi:10.3389/fnins.2017.00703 · Cited by 104 · see citing works
“However, another study showed that injection of IL33 led to improved memory deficit in APP/PS1 AD mice model (Fu et al., 2016).”
BackgroundDarwish, S. F., Elbadry, A. M. M., Elbokhomy, A. S., Salama, G. A., & Salama, R. M. (2023) · Frontiers in Aging · doi:10.3389/fragi.2023.1231706 · Cited by 106 · see citing works
“Alzheimer’s disease is the prevailing type of dementia, associated with damaged locomotor ability, thinking, judgment ability, increasing memory loss, and cognitive decline (Fu et al., 2016).”
BackgroundFairlie‐Clarke, K. J., Barbour, M., Wilson, C., Hridi, S. U., Allan, D., & Jiang, H. (2018) · Frontiers in Immunology · doi:10.3389/fimmu.2018.02596 · Cited by 100 · see citing works
“Patients with mild cognitive impairment, who have an increased risk of AD development, also exhibit a significantly higher serum level of sST2 (52).”
BackgroundKong, F., Jiang, X., Wang, R., Zhai, S., Zhang, Y., & Wang, D. (2020) · Journal of Neuroinflammation · doi:10.1186/s12974-020-01967-2 · Cited by 99 · see citing works
“Aβ can activate neuroglia and stimulate the expression of pro-inflammatory chemokines such as TNF-α and ILs, perhaps leading to increased Aβ production and neuronal death [36, 37].”
BackgroundAutoimmune Neuroinflammatory Diseases: Role of Interleukins
Khan, A. W., Farooq, M., Hwang, M.-J., Haseeb, M., & Choi, S. (2023) · International Journal of Molecular Sciences · doi:10.3390/ijms24097960 · Cited by 104 · see citing works
Mitochondrial dysfunction in chronic neuroinflammatory diseases (Review)
Qin, P., Sun, Y., & Li, L. (2024) · International Journal of Molecular Medicine · doi:10.3892/ijmm.2024.5371 · Cited by 104 · see citing works
“Excessive activation of microglial cells and reduced phagocytic ability leads to increased accumula‑ tion of A β plaques and τ hyperphosphorylation, exacerbating neuroinflammation (164).”
BackgroundZhao, X., Li, S., Gaur, U., & Zheng, W. (2020) · Aging and Disease · doi:10.14336/ad.2019.0813 · Cited by 91 · see citing works
“AD is one of the neurodegenerative disorders that affects older population and is clinically characterized by progressive loss of memory along with decline in multiple cognitive abilities [42, 43].”
BackgroundScholtzova, H., Do, E., Dhakal, S., Sun, Y., Liu, S., Mehta, P. D., & Wisniewski, T. (2017) · The Journal of Neuroscience · doi:10.1523/jneurosci.1967-16.2016 · Cited by 82 · see citing works
“Similarly, APP/PS1 mice treatment with IL33, which skews microglia toward an alternative activation state with enhanced phagocytic capacity, resulted in AD pathology amelioration in association with Iba1 microglia in the vicinity of amyloid deposits (Fu et al., 2016).”
BackgroundWu, P.-J., Hung, Y.-F., Liu, H., & Hsueh, Y. (2017) · NeuroImmunoModulation · doi:10.1159/000477092 · Cited by 84 · see citing works
Cao, K., Liao, X., Lü, J., Yao, S., Wu, F., Zhu, X., Shi, D., Wen, S., Liu, L., & Zhou, H. Y. (2018) · Journal of Neuroinflammation · doi:10.1186/s12974-018-1169-6 · Cited by 84 · see citing works
“have shown that IL-33 ameliorated cognitive decline in an animal model of Alzheimer’s disease [38].”
Tzeng, T.-T., Chen, C.-C., Chen, C.-C., Tsay, H., Lee, L.-Y., Chen, W.-P., Shen, C.-C., & Shiao, Y. (2018) · International Journal of Molecular Sciences · doi:10.3390/ijms19020598 · Cited by 81 · see citing works
Early Life Stress and Epigenetics in Late-onset Alzheimer’s Dementia: A Systematic Review
Lemche, E. (2018) · Current Genomics · doi:10.2174/1389202919666171229145156 · Cited by 82 · see citing works
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“Extending that role into a transgenic mouse model of Alzheimer’s disease, IL33 shifted the activation state of microglia from a proinflammatory profile towards a profile expressing anti-inflammatory genes with improved phagocytosis and again improved fearconditioned learning [64].”
BackgroundLiu, R., Yang, J., Liu, L., Lü, Z., Shi, Z., Ji, W., Shen, J., & Zhang, X. (2019) · Advanced Science · doi:10.1002/advs.201901555 · Cited by 79 · see citing works
Microglia and Wnt Pathways: Prospects for Inflammation in Alzheimer’s Disease
Yang, Y., & Zhang, Z. (2020) · Frontiers in Aging Neuroscience · doi:10.3389/fnagi.2020.00110 · Cited by 76 · see citing works
He, Z., Yang, Y., Xing, Z., Zuo, Z., Wang, R., Gu, H., Qi, F., & Yao, Z. (2020) · Cell Death and Disease · doi:10.1038/s41419-020-2644-4 · Cited by 77 · see citing works
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IL-33 and its decoy sST2 in patients with Alzheimer’s disease and mild cognitive impairment
Saresella, M., Marventano, I., Piancone, F., La Rosa, F., Galimberti, D., Fenoglio, C., Scarpini, E., & Clerici, M. (2020) · Journal of Neuroinflammation · doi:10.1186/s12974-020-01806-4 · Cited by 75 · see citing works
Xiong, R., Zhou, X., Tang, Y., Wu, J., Sun, Y., Teng, J., Pan, R., Law, B. Y. K., Zhao, Y., Qiu, W., et al. (2020) · Phytotherapy Research · doi:10.1002/ptr.6849 · Cited by 78 · see citing works
“The expression of ZO-1 and Claudin 5 in endothelial cells of tissue was detected by immunohistochemical method as previously described (Fu et al., 2016).”
MethodSelf-citationMacrophages originated IL-33/ST2 inhibits ferroptosis in endometriosis via the ATF3/SLC7A11 axis
Wu, Q., Liang, Z., Jiang, J., et al. (2023) · Cell Death and Disease · doi:10.1038/s41419-023-06182-4 · Cited by 74 · see citing works
“It is also worth mentioning that IL-33 induces macrophage anti-in fl ammatory polarization and stimulates the formation of splenic red pulp macrophages (RPMs) that regulate erythrocyte homeostasis and support iron recycling [9, 10].”
Cortese, G. P., & Bürger, C. (2016) · Behavioural Brain Research · doi:10.1016/j.bbr.2016.08.027 · Cited by 74 · see citing works
AmeliMojarad, M., & AmeliMojarad, M. (2024) · CNS Neuroscience & Therapeutics · doi:10.1111/cns.14856 · Cited by 73 · see citing works
Wang, Y., Fu, A. K. Y., & Ip, N. Y. (2021) · FEBS Journal · doi:10.1111/febs.15878 · Cited by 71 · see citing works
Self-citationShe, L., Sun, J., Li, X., Li, A., Li, L., Wu, H., Ren, J., Wang, W., Liang, G., & Zhao, X. (2023) · Phytomedicine · doi:10.1016/j.phymed.2023.155168 · Cited by 81 · see citing works
Roles of Cytokines in Alzheimer’s Disease
Chen, Z., Balachandran, Y. L., Chong, W. P., & Chan, K. W. Y. (2024) · International Journal of Molecular Sciences · doi:10.3390/ijms25115803 · Cited by 71 · see citing works
“Microglia are professional phagocytes and play a critical role in A β plaque clearance in the AD brain [3].”
BackgroundInfluentialNeurovascular unit, neuroinflammation and neurodegeneration markers in brain disorders
Kempuraj, D., Dourvetakis, K. D., Cohen, J., Valladares, D. S., Joshi, R. S., Kothuru, S. P., Anderson, T., Chinnappan, B., Cheema, A. K., Klimas, N. G., et al. (2024) · Frontiers in Cellular Neuroscience · doi:10.3389/fncel.2024.1491952 · Cited by 75 · see citing works
Noh, M., Kwon, H. S., Kwon, M., Nahm, M., Jin, H. K., Bae, J., & Kim, S. H. (2025) · Molecular Neurodegeneration · doi:10.1186/s13024-025-00867-4 · Cited by 85 · see citing works
“Interleukin (IL) − 33, a cytokine belonging to the IL-1 family, also promotes microglial recruitment and Aβ clearance through the ST2/p38 signaling pathway, leading to a reduction in soluble Aβ and amyloid plaque burden [124].”
The VCAM1–ApoE pathway directs microglial chemotaxis and alleviates Alzheimer’s disease pathology
Lau, S.-F., Wu, W., Wong, H. Y., Ouyang, L., Qiao, Y., Xu, J., Lau, J. H.-Y., Wong, C., Jiang, Y., Holtzman, D. M., et al. (2023) · Nature Aging · doi:10.1038/s43587-023-00491-1 · Cited by 70 · see citing works
Self-citationThe Role of Vascular Cells in Pancreatic Beta-Cell Function
Burganova, G., Bridges, C. A., Thorn, P., & Landsman, L. (2021) · Frontiers in Endocrinology · doi:10.3389/fendo.2021.667170 · Cited by 65 · see citing works
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Duan, Y., Tao, Y., Qu, Z., Chen, Y., Miranda, A., Zhou, X., Lok, K.-C., Chen, Y., Fu, A. K. Y., Gradinaru, V., et al. (2021) · Nature Biomedical Engineering · doi:10.1038/s41551-021-00759-0 · Cited by 64 · see citing works
Self-citationType 2 immunity in the brain and brain borders
Mamuladze, T., & Kipnis, J. (2023) · Cellular and Molecular Immunology · doi:10.1038/s41423-023-01043-8 · Cited by 65 · see citing works
Chen, C., Liang, Z., Zhou, B., Li, X., Lui, C., Ip, N. Y., & Qu, J. Y. (2018) · ACS Chemical Neuroscience · doi:10.1021/acschemneuro.8b00306 · Cited by 63 · see citing works
Self-citationDual roles of interleukin-33 in cognitive function by regulating central nervous system inflammation
Rao, X., Hua, F., Zhang, L., Lin, Y., Fang, P., Chen, S., Ying, J., & Wang, X. (2022) · Journal of Translational Medicine · doi:10.1186/s12967-022-03570-w · Cited by 64 · see citing works
“IL-33 treatment significantly reversed the LTP impairment and contextual memory deficits of APP/PS1 mice, while also improving habituation to a new environment, which confirmed that IL-33 treatment reversed the reduction of synaptic plasticity in the hippocampus and cognitive deficits in APP/PS1 mice [2, 24].”
BackgroundInfluentialInterleukin‐33 regulates tissue remodelling and inhibits angiogenesis in the eye
Theodoropoulou, S., Copland, D. A., Liu, J., Wu, J., Gardner, P. J., Ozaki, E., Doyle, S., Campbell, M. D., & Dick, A. D. (2016) · The Journal of Pathology · doi:10.1002/path.4816 · Cited by 62 · see citing works
“IL-33 prevents cognitive decline in mouse models of Alzheimer’s disease [47] and inhibits atherosclerosis [45], and here IL-33 also directly inhibited choroidal fibroblast activity, implicating a potentially wider role clinically.”
BackgroundImpact of aging immune system on neurodegeneration and potential immunotherapies
Liang, Z., Zhao, Y., Ruan, L., Zhu, L., Jin, K., Zhuge, Q., Su, D., & Zhao, Y. L. (2017) · Progress in Neurobiology · doi:10.1016/j.pneurobio.2017.07.006 · Cited by 61 · see citing works
“However, it was recently reported that serum levels of soluble ST2, a decoy receptor for IL-33, significantly increased in patients with mild cognitive impairment, indicating that impaired IL-33/ST2 signaling pathwaymaycontribute to the pathogenesis of AD in APP/PS1mice (Fu et al., 2016).”
Targeting IL-33/ST2 signaling: regulation of immune function and analgesia
Fattori, V., Hohmann, M., Rossaneis, A. C., Manchope, M. F., Alves-Filho, J., Cunha, T., Cunha, F., & Verri, W. (2017) · Expert opinion on therapeutic targets · doi:10.1080/14728222.2017.1398734 · Cited by 61 · see citing works
“In fact, immunohistochemical analysis of spinal cord tissue after SCI demonstrated that rIL-33 treatment decreases the activation of astrocytes but does not alter microglial activity in vivo [33], despite evidence indicating that microglia express ST2 given IL-33 induce M2 polarization or activation of microglia in vi…”
Targeting the IL33–NLRP3 axis improves therapy for experimental cerebral malaria
Strangward, P., Haley, M., Albornoz, M. G., Barrington, J., Shaw, T. N., Dookie, R. S., Zeef, L. A. H., Baker, S. M., Winter, E., Tzeng, T.-C. J., et al. (2018) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1801737115 · Cited by 60 · see citing works
“(A) Peripheral parasitemia, (B) survival curves, and (C) RMCBS scores of mice after infection (d0) and drug treatment (gray box).”
BackgroundMethodResultInfluentialSelf-citationChandra, S., Di Meco, A., Dodiya, H. B., Popovic, J., Cuddy, L. K., Weigle, I. Q., Zhang, X., Sadleir, K., Sisodia, S. S., & Vassar, R. (2023) · Molecular Neurodegeneration · doi:10.1186/s13024-023-00635-2 · Cited by 58 · see citing works
Mechanisms of microglia-mediated synapse turnover and synaptogenesis
Ball, J. B., Green‐Fulgham, S. M., & Watkins, L. R. (2022) · Progress in Neurobiology · doi:10.1016/j.pneurobio.2022.102336 · Cited by 63 · see citing works
Carlock, C., Wu, J., Shim, J., Moreno‐González, I., Pitcher, M. R., Hicks, J., Suzuki, A., Iwata, J., Quevado, J., & Lou, Y. (2017) · Translational Psychiatry · doi:10.1038/tp.2017.142 · Cited by 59 · see citing works
The Role of Glial Cells in Synaptic Dysfunction: Insights into Alzheimer's Disease Mechanisms
Yu, Y., Chen, R., Mao, K., Deng, M., & Li, Z. (2023) · Aging and Disease · doi:10.14336/ad.2023.0718 · Cited by 60 · see citing works
“IL-33 also triggered a transition in microglia status and increased phagocytosis of Aβ plaques in APP/PS1 mice [91, 92].”
BackgroundInflammasomes and Cell Death: Common Pathways in Microparticle Diseases
Rashidi, M., Wicks, I. P., & Vince, J. E. (2020) · Trends in Molecular Medicine · doi:10.1016/j.molmed.2020.06.005 · Cited by 56 · see citing works
- Authors
- Fu, A. K. Y., Hung, K.-W., Yuen, M. Y. F., Zhou, X., Mak, D. S. Y., Chan, I. C. W., Cheung, T. H., Zhang, B., Fu, W.-Y., Liew, F. Y., & Ip, N. Y.
- Affiliations
- Hong Kong University of Science and Technology (HK)
- Second Affiliated Hospital of Zhejiang University (CN)
- Soochow University (CN)
- ORCID
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2016-04-18
- Volume
- 113
- Issue
- 19
- Pages
- E2705-13
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC4868478
- OpenAlex
- W2342031861
- Semantic Scholar
- 1eac3f908af98105c0179fde2edb52b24e9f5d0c
- Cited by
- 369
- References
- 61
- Citations by year
- 2026: 18 · 2025: 41 · 2024: 45 · 2023: 39 · 2022: 33 · 2021: 48 · 2020: 40 · 2019: 24 · 2018: 35 · 2017: 31 · 2016: 14 · 2012: 1
- FWCI
- 27.92
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) (acceptedVersion)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- Topics
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Life Sciences › Immunology and Microbiology › Immunology › IL-33, ST2, and ILC Pathways
- Keywords
- IL-33, Alzheimer's disease, soluble ST2, amyloid-beta, microglial activation, innate immunity, synaptic plasticity, memory impairment, APP/PS1 mice, amyloid plaques, p38 MAPK signaling, microglial polarization, neuroinflammation, NLRP3 inflammasome, IL-1β, interleukin-6
- MeSH terms
- Interleukin-33, Alzheimer Disease, Animals, Brain, Cognition Disorders, Female, Male, Mice, Transgenic, Cytokines, Treatment Outcome, Neuroprotective Agents, Mice
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-10.
Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-10.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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