Cited by 309Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsNeurological Disease Mechanisms and Treatments

Focal glial activation coincides with increased BACE1 activation and precedes amyloid plaque deposition in APP[V717I] transgenic mice

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Heneka, Michael T, Sastre, Magdalena, Dumitrescu-Ozimek, Lucia, Dewachter, Ilse, Walter, Jochen, Klockgether, Thomas, Van Leuven, Fred·2005·Journal of Neuroinflammation

Abstract

BACKGROUND: Inflammation is suspected to contribute to the progression and severity of neurodegeneration in Alzheimer's disease (AD). Transgenic mice overexpressing the london mutant of amyloid precursor protein, APP [V717I], robustly recapitulate the amyloid pathology of AD. METHODS: Early and late, temporal and spatial characteristics of inflammation were studied in APP [V717I] mice at 3 and 16 month of age. Glial activation and expression of inflammatory markers were determined by immunohistochemistry and RT-PCR. Amyloid deposition was assessed by immunohistochemistry, thioflavine S staining and western blot experiments. BACE1 activity was detected in brain lysates and in situ using the BACE1 activity kit from R&D Systems, Wiesbaden, Germany. RESULTS: Foci of activated micro- and astroglia were already detected at age 3 months, before any amyloid deposition. Inflammation parameters comprised increased mRNA levels coding for interleukin-1beta, interleukin-6, major histocompatibility complex II and macrophage-colony-stimulating-factor-receptor. Foci of CD11b-positive microglia expressed these cytokines and were neighbored by activated astrocytes. Remarkably, beta-secretase (BACE1) mRNA, neuronal BACE1 protein at sites of focal inflammation and total BACE1 enzyme activity were increased in 3 month old APP transgenic mice, relative to age-matched non-transgenic mice. In aged APP transgenic mice, the mRNA of all inflammatory markers analysed was increased, accompanied by astroglial iNOS expression and NO-dependent peroxynitrite release, and with glial activation near almost all diffuse and senile Abeta deposits. CONCLUSION: The early and focal glial activation, in conjunction with upregulated BACE1 mRNA, protein and activity in the presence of its substrate APP, is proposed to represent the earliest sites of amyloid deposition, likely evolving into amyloid plaques.

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  • CCL2 and TNFα mRNA levels were elevated in APPPS1;Cx3cr1+/+ mouse brain.

    “Similar to previous findings in AD brains and mouse models, 39 -42 the levels of CCL2 and TNF␣ mRNAs were elevated in the APPPS1;Cx3cr1 ϩ/ϩ mouse brain.”

    From CX3CR1 Deficiency Alters Microglial Activation and Reduces Beta-Amyloid Deposition in Two Alzheimer's Disease Mouse Models (2010) · cites this paper as [41]

    The citation supports the sentence’s reference to previous inflammatory findings in AD mouse models: the Discussion reports TNFα mRNA in an earlier APP-transgenic mouse study. It does not support elevated CCL2 mRNA, and its own Results say TNFα was undetectable in APP[V717I] mice. The APPPS1;Cx3cr1+/+ result is the citing authors’ finding, not one attributed to this source. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Previous studies of our group have identified molecular differences between SAD and FAD in addition to divergences in clinical manifestations.

    “Previous studies of our group have identified molecular differences between SAD and FAD [55, 56, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79] in addition to divergences in the clinical manifestations [55, 56].”

    From Gliovascular alterations in sporadic and familial Alzheimer's disease: <scp><i>APOE3</i></scp> Christchurch homozygote glioprotection (2023) · cites this paper as [71]

    The Background (page unavailable) links familial Alzheimer’s disease to APP mutations, and the Conclusion (page unavailable) reports increased BACE1 expression and activity in mice carrying a mutant APP gene. The paper does not compare sporadic and familial Alzheimer’s disease or establish molecular differences between them; the clinical-manifestations clause is attributed to other citations. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Fine‐tuned modification of astrocytic GFAP and vimentin expression is critical for the execution of the astrocyte reactive program.

    “fine‐tuned modification of astrocytic GFAP and vimentin expression is critical for the execution of the astrocyte reactive program [28, 71, 91].”

    From Gliovascular alterations in sporadic and familial Alzheimer's disease: <scp><i>APOE3</i></scp> Christchurch homozygote glioprotection (2023) · cites this paper as [71]

    The Results and Discussion (page unavailable) associate increased astrocytic GFAP expression with activation in APP[V717I] mice. They do not address vimentin or establish that fine-tuned changes in either protein are critical for executing a reactive program. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Astroglial proliferation has also been related with GFAP upregulation.

    “Astroglial proliferation has also been related with GFAP upregulation [71, 91, 110].”

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Authors
Heneka, M. T., Sastre, M., Dumitrescu-Ozimek, L., Dewachter, I., Walter, J., Klockgether, T., & Van Leuven, F.
Affiliations
  • University of Münster (DE)
  • University of Bonn (DE)
  • KU Leuven (BE)
Corresponding author
Heneka, Michael T
Venue
Journal of Neuroinflammation
Published
2005-10-07
Volume
2
Issue
1
Pages
22-22
ISSN
1742-2094 (ISSN-L)
OpenAlex
W2124127229
Cited by
309
References
5
Citations by year
2026: 7 · 2025: 8 · 2024: 8 · 2023: 25 · 2022: 14 · 2021: 21 · 2020: 21 · 2019: 18 · 2018: 22 · 2017: 21 · 2016: 12 · 2015: 24 · 2014: 18 · 2013: 19 · 2012: 6
FWCI
5.22
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Neuroinflammation (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Open Repository and Bibliography (University of Luxembourg) (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Document Server@UHasselt (UHasselt) (submittedVersion, cc-by)
Funders
  • Deutsche Forschungsgemeinschaft (SFB400)
  • Fonds Wetenschappelijk Onderzoek
  • Vlaamse regering
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
Alzheimer's disease, glial activation, BACE1, beta-secretase, amyloid plaques, amyloid precursor protein, neuroinflammation, microglia, astrocytes, IL-1β, interleukin-6, MHC class II, macrophage colony-stimulating factor receptor, inducible nitric oxide synthase, peroxynitrite, nitric oxide, amyloid-beta deposition, early neurodegeneration

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