Loss of autophagy in dopaminergic neurons causes Lewy pathology and motor dysfunction in aged mice
Open accessAbstract
Inactivation of constitutive autophagy results in the formation of cytoplasmic inclusions in neurons, but the relationship between impaired autophagy and Lewy bodies (LBs) as well as the in vivo process of formation remains unknown. Synuclein, a component of LBs, is the defining characteristic of Parkinson’s disease (PD). Here, we characterize dopamine (DA) neuron–specific autophagy-deficient mice and provide in vivo evidence for LB formation. Synuclein deposition is preceded by p62 and resulted in the formation of inclusions containing synuclein and p62. The number and size of these inclusions were gradually increased in neurites rather than soma with aging. These inclusions may facilitate peripheral failures. As a result, DA neuron loss and motor dysfunction including the hindlimb defect were observed in 120-week-old mice. P62 aggregates derived from an autophagic defect might serve as “seeds” and can potentially be cause of LB formation.
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TL;DR
Dopamine neuron–specific Atg7 deletion in mice causes age-related p62 inclusions that precede synuclein accumulation, Lewy-like pathology, loss of TH neurons, and motor dysfunction. The findings suggest autophagic p62 aggregates may serve as “seeds” for Lewy body formation.
Key findings
- Atg7flox/flox:TH-Cre mice had 13.54 ± 2.27% residual Atg7 in midbrain versus controls and developed motor coordination impairment around 100 weeks, with apparent deficits around 110 weeks, including frequent hindlimb slips on the runway and reduced rotarod fall latency.
- p62-positive inclusions appeared in substantia nigra dopaminergic neurons by 2 months, increased in number and size with age, and were mainly localized outside the soma along neurites; synuclein accumulation was observed around 9 months and colocalized with p62 inclusions, with 89.30 ± 1.65% of synuclein inclusions located in TH fibers (n = 5, each 2 slices).
- In 120-week-old mice, Atg7flox/flox:TH-Cre mice had fewer TH neurons than controls, most prominently in the center area of substantia nigra pars compacta (SNcc) (n = 4 cKO; n = 5 control), and HPLC showed reduced striatal DA and metabolites (n = 3 per group; *P = 0.05).
- Ultrastructural analysis showed electron-dense filamentous inclusions in SN somata and neurites containing mitochondria and autophagosome-like structures; the authors speculate p62 aggregates containing mitochondria represent early Lewy body biogenesis.
Methods
- Generated tyrosine hydroxylase (TH) neuron–specific Atg7 conditional knockout mice (Atg7flox/flox:TH-Cre) by crossing Atg7flox/flox mice with TH-Cre mice; controls were Atg7flox/flox mice.
- Assessed locomotor behavior from 90 to 120 weeks using an accelerating rotarod (3 to 35 rpm over 5 min) and a narrow beam runway test; performed immunoblot, immunohistochemistry, immunofluorescence, electron microscopy/immunoelectron microscopy, and HPLC of dorsal striatum.
- Statistical significance was determined by Student’s t-test; behavioral tests used n = 10 per genotype, TH neuron counts used n = 4 cKO and n = 5 control, and HPLC used n = 3 per group.
Limitations
- The paper states that many questions remain about Lewy body formation, that none of the current genetic PD mouse models recapitulates all features of PD, and that only a few develop mild DA neurodegeneration; it also notes that compensatory mechanisms during development may make degenerative phenotypes hard to observe over the mouse lifespan.
- The paper states that the reason the significant decrease in dopamine was not accompanied by concomitant reductions in DOPAC and HVA was not clarified, and it describes the p62 “seed” role as speculation.
- Evident from the text: survival was not observed over the entire lifespan, some synuclein data at early stages are reported as “data not shown,” and terminal analyses used small sample sizes (n = 3–5 per group).
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- Findingown data
These inclusions are observed not only within the soma but also outside the soma.
“Interestingly, we observed these inclusions not only within the soma, but also outside the soma (Fig. 3D lower panel).”
Quote in the paperNot a substantial claim - Findingown data
Most inclusions localize in neurites.
“To determine the localization of these inclusions, we analyzed many samples by confocal microscopy, and found that most inclusions localized in neurites, as demonstrated in Fig. 2D.”
Quote in the paperNot a substantial claim - Findingown data
In Atg7flox/flox:TH-Cre mice, locus coeruleus neurons contain eosinophilic aggregates characteristic of Lewy bodies.
“In Atg7flox/flox:TH-Cre mice, these neurons contained 7 eosinophilic aggregates, which are characteristic of LBs (Fig. 1Da).”
Quote in the paperNot a substantial claim - Findingown data
The level of synuclein is increased in the midbrain of Atg7flox/flox:TH-Cre mice.
“Furthermore, the level of synuclein increased in the midbrain of Atg7flox/flox:TH-Cre mice (Fig. 3B and C).”
Quote in the paperSubstantial claim - Findingown data
p62-positive aggregates are present along neurites of dopaminergic neurons.
“Specifically, we labeled dopaminergic neurons with TH antibody (Fig. 2D red) and followed individual fibers, revealing that p62-positive aggregates (Fig. 2D green) were present along neurites.”
Quote in the paperSubstantial claim
- Findingown data
Fibrous inclusions are localized in the soma and neurites of DA neurons in Atg7flox/flox:TH-Cre mice.
“Fibrous inclusions localized in the soma (Fig. 2Ea,b) and neurites (Fig. 2Ec,d) in DA neurons.”
Quote in the paperSubstantial claim - Findingown data
Around 9 months, endogenous synuclein accumulation is present in somata and neurites of Atg7flox/flox:TH-Cre mice.
“Surprisingly, around 9 months, we pathologically confirmed endogenous synuclein accumulation in somata and neurites (Fig. 3A).”
Quote in the paperSubstantial claim - Findingown data
Atg7flox/flox:TH-Cre mice have fewer TH neurons than Atg7flox/flox mice.
“Atg7flox/flox:TH-Cre mice had fewer TH neurons than Atg7flox/flox mice.”
Quote in the paperSubstantial claim - Findingown data
In Atg7flox/flox:TH-Cre midbrains, Atg7 protein is reduced to 13.54 ± 2.27% residual amount compared to controls.
“In Atg7flox/flox:TH-Cre midbrains, the quantification of Atg7 after normalization by actin (Supple. Figure 1B) showed 13.54 ± 2.27% residual amount, compared to controls.”
Quote in the paperSubstantial claim - Findingown data
Atg7flox/flox:TH-Cre mice exhibit synuclein deposition and inclusions that colocalize with p62 in cell bodies.
“On the other hand, Atg7flox/flox:TH-Cre mice exhibited synuclein deposition and inclusions that colocalized with p62 in cell bodies (Fig. 3D middle panel).”
Quote in the paperSubstantial claim - Findingown data
89.30 ± 1.65% of synuclein inclusions are located in TH fibers.
“High resolution confocal images through SN show immunofluorescence labeling of TH and synuclein, where 89.30 ± 1.65% (n = 5, each 2 slices) synuclein inclusions located in TH fibers (Supple. Figure 2C).”
Quote in the paperNot a substantial claim - Findingown data
Atg7flox/flox:TH-Cre mice frequently slip hindpaws off the beam in the runway test.
“In particular, the hindpaws of Atg7flox/flox:TH-Cre mice often slipped off the beam (Fig. 1Bb and c).”
Quote in the paperSubstantial claim - Findingown data
HPLC reveals a reduction in striatal DA levels and metabolites in Atg7flox/flox:TH-Cre versus control mice.
“High-performance liquid chromatography (HPLC) revealed a reduction in striatal DA levels and metabolites in Atg7flox/flox:TH-Cre versus control mice (Fig. 4C).”
Quote in the paperSubstantial claim - Findingown data
In aged Atg7flox/flox:TH-Cre mice, synuclein accumulated in neurites and/or cell bodies involved in inclusions.
“In aged Atg7flox/flox:TH-Cre mice, synuclein accumulated in the neurites and/or cell bodies involved in inclusions.”
Quote in the paperSubstantial claim - Findingown data
The reduction in TH cell number is most prominent in the center area of substantia nigra pars compacta (SNcc).
“The reduction in TH cell number was most prominent in the center area of substantia nigra pars compacta (SNcc) (Fig. 4B).”
Quote in the paperNot a substantial claim - Findingown data
Atg7flox/flox:TH-Cre mice exhibit reduced fall latency in the accelerating rotarod test compared to controls.
“Furthermore, in the accelerating rotarod test, the fall latency was reduced in Atg7flox/flox:TH-Cre mice (Fig. 1C).”
Quote in the paperSubstantial claim - Findingown data
In this study, synuclein deposition is preceded by the formation of p62 inclusion in DA neurons.
“Intriguingly, in this study we observed for the first time that synuclein deposition is preceded by the formation of p62 inclusion in DA neurons.”
Quote in the paperSubstantial claim - Findingown data
Autophagosome-like structures are observed in these inclusions.
“In these inclusions, autophagosome-like structures were observed (Fig. 2Ec).”
Quote in the paperNot a substantial claim - Findingown data
p62- and synuclein-positive inclusions are prone to colocalize in peripheral regions.
“Our observations that p62- and synuclein-positive inclusions are prone to colocalize in peripheral regions (Fig. 3D and E) support this hypothesis.”
Quote in the paperSubstantial claim - Findingown data
Many mitochondria are present in aggregates.
“Our ultrastructural study revealed that many mitochondria were present in aggregates (Fig. 2Ec,d).”
Quote in the paperSubstantial claim - Findingown data
Atg7flox/flox:TH-Cre mice exhibit age-related growth and spreading of p62 aggregates in the peripheral region.
“In our study, Atg7flox/flox:TH-Cre mice exhibited age-related growth and spreading of p62 aggregates in the peripheral region (Fig. 2A).”
Quote in the paperSubstantial claim - Findingnone given
The significant decrease in dopamine is not accompanied by concomitant reductions in the dopamine catabolites DOPAC and HVA.
“Intriguingly, the significant decrease in dopamine is not accompanied by concomitant reductions in the dopamine catabolites DOPAC and HVA.”
Quote in the paperNot a substantial claim - Premisecitation
Mutant forms of synuclein and oligomers are dependent on the autophagy-lysosome pathway for their clearance.
“However, mutant forms of synuclein and oligomers are dependent on the autophagy–lysosome pathway for their clearance4–6.”
Quote in the paperSubstantial claim0 of 3 sources checked- cites [4] Webb, J. L., Ravikumar, B., Atkins, J., Skepper, J. N. & Rubinsztein, D. C. Alpha-Synuclein is degraded by both autophagy and the proteasome. J Biol Chem 278, 25009–25013 (2003). source
Not checked in the free run.
- cites [5] Spencer, B. et al. Beclin 1 gene transfer activates autophagy and ameliorates the neurodegenerative pathology in alpha-synuclein models of Parkinson’s and Lewy body diseases. J Neurosci 29, 13578–13588 (2009). source
Not checked in the free run.
- cites [6] Yu, W. H. et al. Metabolic activity determines efficacy of macroautophagic clearance of pathological oligomeric alpha-synuclein. Am J Pathol 175, 736–747 (2009). source
Not checked in the free run.
- Premisecitation
Overexpression of wild-type synuclein impairs autophagic activity.
“Conversely, overexpression of wild-type synuclein impairs autophagic activity, implying a functional relationship between synuclein and autophagic degradation19.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [19] Winslow, A. R. et al. alpha-Synuclein impairs macroautophagy: implications for Parkinson’s disease. J Cell Biol 190, 1023–1037 (2010). source
Not checked in the free run.
- Interpretationown data
Long-term disruption of autophagy results in widespread synuclein accumulation in DA neurons.
“Our results indicate that long-term disruption of autophagy results in widespread synuclein accumulation in DA neurons.”
Quote in the paperSubstantial claim - Interpretationown data
Autophagy regulates synuclein levels to some extent.
“Our results suggest that autophagy regulates synuclein levels to some extent”
Quote in the paperSubstantial claim - Interpretationown data
DA content is affected by dopaminergic neuronal loss.
“Thus, DA content is affected by dopaminergic neuronal loss.”
Quote in the paperSubstantial claim - Interpretationown data
Autophagy maintains the level of endogenous synuclein in DA neurons.
“Autophagy maintains the level of endogenous synuclein in DA neurons.”
Quote in the paperSubstantial claim - Interpretationreasoning
Autophagy plays a significant role in synuclein degradation in dopaminergic neurons.
“In any case, it is clear that autophagy plays a significant role in synuclein degradation in dopaminergic neurons.”
Quote in the paperSubstantial claim - Interpretationown data
These inclusions had characteristics of Lewy bodies.
“In addition, these inclusions had characteristics of LBs.”
Quote in the paperSubstantial claim - Interpretationown data
Age-related motor dysfunction and pathology in mice with Atg7 deficiency in DA neurons suggests that impairment of autophagy is a potential mechanism underlying the pathology of PD.
“In this study, the age-related motor dysfunction and pathology in mice with Atg7 deficiency in DA neurons suggests that impairment of autophagy is a potential mechanism underlying the pathology of PD.”
Quote in the paperSubstantial claim - Premisecitation
During mitochondrial degradation in cultured cells, depolarized mitochondria cluster with p62.
“During mitochondrial degradation in cultured cells, depolarized mitochondria cluster with p6224.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [24] Okatsu, K. et al. p62/SQSTM1 cooperates with Parkin for perinuclear clustering of depolarized mitochondria. Genes Cells 15, 887–900 (2010). source
Not checked in the free run.
- Premisecitation
In the human brain, synuclein deposition and neuronal degeneration are accentuated in distal regions.
“In the human brain, synuclein deposition and neuronal degeneration are accentuated in distal regions23.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [23] Uchihara, T. & Giasson, B. I. Propagation of alpha-synuclein pathology: hypotheses, discoveries, and yet unresolved questions from experimental and human brain studies. Acta Neuropathol 131, 49–73 (2016). source
Not checked in the free run.
- Premisecitation
LBs are usually absent in autosomal recessive early-onset Parkinsonism caused by Parkin mutations.
“consistent with the fact that LBs are usually absent in autosomal recessive early-onset Parkinsonism caused by Parkin mutations27.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [27] Mori, H. et al. Pathologic and biochemical studies of juvenile parkinsonism linked to chromosome 6q. Neurology 51, 890–892 (1998). source
Not checked in the free run.
- Interpretationreasoning
Parkin-mediated p62 clustering may be a key process of LB formation.
“Thus, Parkin-mediated p62 clustering may be a key process of LB formation, consistent with the fact that LBs are usually absent in autosomal recessive early-onset Parkinsonism caused by Parkin mutations27.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [27] Mori, H. et al. Pathologic and biochemical studies of juvenile parkinsonism linked to chromosome 6q. Neurology 51, 890–892 (1998). source
Not checked in the free run.
- May combine two claims. 19
- Classified as probably not a substantial claim. 16
May combine two claims.
Findingown dataAtg7flox/flox:TH-Cre mice begin to show impairment in motor coordination tasks around 100 weeks and apparent motor behavioral deficits around 110 weeks.
“Although Atg7flox/flox:TH-Cre mice have not yet been observed over the entire lifespan, they began to show impairment in motor coordination tasks around 100 weeks and apparent motor behavioral deficits around 110 weeks.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataNo neuronal loss is observed in young mice, which did not exhibit motor dysfunction.
“No neuronal loss was observed in young mice, which did not exhibit motor dysfunction (data not shown).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown datap62 inclusions are present along TH fibers and mainly located in the branch of dopaminergic neurons.
“P62 inclusions were present along the TH fibers, and were mainly located in the branch of dopaminergic neurons (Fig. 2Cb).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataAt higher magnification, these inclusions have multiple cavities.
“When we observed these inclusions at higher magnification, they have multiple cavities (Fig. 3E), consistent with the results of ultrastructural analysis (Fig. 2Ed).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown datap62-positive inclusions are present in 2-month-old Atg7flox/flox:TH-Cre mice, whereas no aggregates are seen in Atg7flox/flox mice even at 18 months.
“In contrast to Atg7flox/flox mice, in which no aggregates were seen even at the age of 18 months (Fig. 2Ab), p62-positive inclusions were present in 2-month-old Atg7flox/flox:TH-Cre mice (Fig. 2Aa).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataThese inclusions are observed in TH-positive neurons and contain ubiquitin and p62.
“In addition, these inclusions were observed in TH-positive neurons (Fig. 1Db), including ubiquitin (Fig. 1Dc) and p62 (Fig. 1Dd).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataThe level of endogenous synuclein protein increased at around 9 months in cell bodies and neurites of Atg7flox/flox:TH-Cre mice, and these accumulated synuclein deposits contained p62 positive aggregates.
“In our careful observation of Atg7flox/flox:TH-Cre mice, we found that the level of endogenous synuclein protein increased at around 9 months in cell bodies and neurites (Fig. 3A,B and C), and these accumulated synuclein deposits contained p62 positive aggregates (Fig. 3D).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataIn 18-month-old Atg7flox/flox:TH-Cre mice, p62 inclusions are larger and mainly localized outside the soma.
“In 18-month-old mice, p62 inclusions were larger (Fig. 2Ae and B) and mainly localized outside the soma (Fig. 2Ac).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataIn 2-month-old Atg7flox/flox:TH-Cre mice, p62 and ubiquitin accumulate in the midbrain, whereas synuclein does not accumulate at this stage.
“Notably, Western blotting revealed p62 and ubiquitin accumulations in the midbrain of 2 month-old Atg7flox/flox:TH-Cre mice, whereas synuclein did not accumulate in the midbrain, at least at this stage (data not shown).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataAtg7flox/flox:TH-Cre mice are viable at birth and indistinguishable in appearance from littermates, and their survival rate is not markedly diminished.
“Atg7flox/flox:TH-Cre mice were viable at birth and indistinguishable in appearance from their littermates, and their survival rate was not markedly diminished.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
PremisecitationBrain-specific deletion of Atg5 or Atg7 in mice reveals a critical role of autophagy in the removal of aggregated proteins.
“Although the phenotypes of mice harboring brain-specific deletion of Atg5 or Atg7 reveal the critical role of autophagy in the removal of aggregated proteins7,8”
Quote in the paperSubstantial claim0 of 2 sources checked- cites [7] Hara, T. et al. Suppression of basal autophagy in neural cells causes neurodegenerative disease in mice. Nature 441, 885–889 (2006). source
Not checked in the free run.
- cites [8] Komatsu, M. et al. Loss of autophagy in the central nervous system causes neurodegeneration in mice. Nature 441, 880–884 (2006). source
Not checked in the free run.
Classified as probably not a substantial claim.
PremisecitationDA neuron-specific autophagy deficiency leads to restrictive presynaptic accumulation of synuclein in the dorsal striatum.
“Friedman et al.9 demonstrated that DA neuron-specific autophagy deficiency leads to the restrictive presynaptic accumulation of synuclein in the dorsal striatum, suggesting that impaired autophagy plays a role in PD pathogenesis.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [9] Friedman, L. G. et al. Disrupted autophagy leads to dopaminergic axon and dendrite degeneration and promotes presynaptic accumulation of alpha-synuclein and LRRK2 in the brain. J Neurosci 32, 7585–7593 (2012). source
Not checked in the free run.
Classified as probably not a substantial claim. May combine two claims.
PremisecitationParkinson's disease is characterized by the loss of nigrostriatal dopamine neurons and the formation of intracellular Lewy bodies, which consist primarily of α-synuclein and ubiquitin.
“Parkinson’s disease (PD), the most common neurodegenerative disorder, is characterized by the loss of nigrostriatal dopamine neurons and the formation of intracellular Lewy bodies (LBs), which consist primarily of α-synuclein (hereafter referred to as synuclein) and ubiquitin1.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [1] Spillantini, M. G. et al. Alpha-synuclein in Lewy bodies. Nature 388, 839–840 (1997). source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
Premisecitationp62 is present in neuronal inclusions of individuals with Alzheimer's disease and other neurodegenerative diseases.
“Indeed, p62 is present in neuronal inclusions of individuals with Alzheimer’s disease and other neurodegenerative diseases11”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [11] Bartlett, B. J. et al. p62, Ref(2)P and ubiquitinated proteins are conserved markers of neuronal aging, aggregate formation and progressive autophagic defects. Autophagy 7, 572–583 (2011). source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Premisecitationp62 is a ubiquitin- and LC3-binding protein that functions as a selective autophagy adaptor/receptor for degradation of ubiquitinated substrates.
“In this context, the stress-inducible protein p62 (encoded by the gene Sqstm1) is of importance because it is the ubiquitin- and LC3-binding protein that functions as a selective autophagy adaptor/receptor for degradation of ubiquitinated substrates10.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [10] Komatsu, M. et al. Homeostatic levels of p62 control cytoplasmic inclusion body formation in autophagy-deficient mice. Cell 131, 1149–1163 (2007). source
Not checked in the free run.
May combine two claims.
PremisecitationSeveral lines of evidence indicate a role for autophagy in the regulation of synuclein homeostasis, suggesting that dysfunctional autophagic clearance may contribute to the development of synuclein inclusions.
“Several lines of evidence indicate a role for autophagy in the regulation of synuclein homeostasis5,6,15, suggesting that dysfunctional autophagic clearance may contribute to the development of synuclein inclusions.”
Quote in the paperSubstantial claim0 of 3 sources checked- cites [5] Spencer, B. et al. Beclin 1 gene transfer activates autophagy and ameliorates the neurodegenerative pathology in alpha-synuclein models of Parkinson’s and Lewy body diseases. J Neurosci 29, 13578–13588 (2009). source
Not checked in the free run.
- cites [6] Yu, W. H. et al. Metabolic activity determines efficacy of macroautophagic clearance of pathological oligomeric alpha-synuclein. Am J Pathol 175, 736–747 (2009). source
Not checked in the free run.
- cites [15] Ahmed, I. et al. Development and characterization of a new Parkinson’s disease model resulting from impaired autophagy. J Neurosci 32, 16503–16509 (2012). source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationAutophagosome-like structures have been previously reported in Atg7-deficient brains.
“In fact, these autophagosome-like structures were previously reported in Atg7-deficient brains14.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [14] Komatsu, M. et al. Essential role for autophagy protein Atg7 in the maintenance of axonal homeostasis and the prevention of axonal degeneration. Proc Natl Acad Sci USA 104, 14489–14494 (2007). source
Not checked in the free run.
May combine two claims.
Interpretationown dataLoss of autophagy induces synuclein accumulation and formation of Lewy bodies in DA neurons.
“Thus, loss of autophagy induces synuclein accumulation and formation of LBs, similar to the pathology observed in DA neurons.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationLB-like synuclein aggregates resist degradation and impair autophagy.
“Furthermore, LB-like synuclein aggregates resist degradation and impair autophagy20.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [20] Tanik, S. A., Schultheiss, C. E., Volpicelli-Daley, L. A., Brunden, K. R. & Lee, V. M. Lewy body-like alpha-synuclein aggregates resist degradation and impair macroautophagy. J Biol Chem 288, 15194–15210 (2013). source
Not checked in the free run.
Classified as probably not a substantial claim. May combine two claims.
PremisecitationHomeostasis of p62 is strictly regulated by autophagy in the brain, and dysregulation of autophagy causes formation of p62 aggregates.
“It is well known that homeostasis of p62 is strictly regulated by autophagy in the brain10, and that dysregulation of autophagy causes formation of p62 aggregates.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [10] Komatsu, M. et al. Homeostatic levels of p62 control cytoplasmic inclusion body formation in autophagy-deficient mice. Cell 131, 1149–1163 (2007). source
Not checked in the free run.
May combine two claims.
Interpretationown dataLoss of autophagy in dopaminergic neurons results in Lewy pathology and motor dysfunctions associated with aging.
“In this study, we carried out detailed observations of Atg7-deficient mice, and observed a loss of autophagy in dopaminergic neurons, resulting in Lewy pathology and motor dysfunctions associated with aging.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductnone givenThe synuclein antibody efficiently detects endogenous mouse synuclein.
“Our synuclein antibody efficiently detects endogenous mouse synuclein, and a virtual slide system could be used to observe neurons extensively.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim. May combine two claims.
PremisecitationDA neurons have long hyper-branched projection axons that innervate wide areas in the brain.
“DA neurons have a unique structural characteristic, long hyper-branched projection axons, that innervate wide areas in the brain22.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [22] Sulzer, D. & Surmeier, D. J. Neuronal vulnerability, pathogenesis, and Parkinson’s disease. Mov Disord 28, 715–724 (2013). source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationThe extent to which autophagy contributes to synuclein degradation depends on the presence of mutations.
“The protein catabolic pathways that regulate synuclein degradation have been discussed by multiple authors4,16,17, and the extent to which autophagy contributes to synuclein degradation depends on the presence of mutations18.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [18] Cuervo, A. M., Stefanis, L., Fredenburg, R., Lansbury, P. T. & Sulzer, D. Impaired degradation of mutant alpha-synuclein by chaperone-mediated autophagy. Science 305, 1292–1295 (2004). source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationATG conjugation systems including Atg7 are not absolutely essential for autophagosome formation.
“But, as to autophagosome formation, ATG conjugation systems including Atg7 are not absolutely essential13.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [13] Tsuboyama, K. et al. The ATG conjugation systems are important for degradation of the inner autophagosomal membrane. Science 354, 1036–1041 (2016). source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
InterpretationcitationOne explanation for the lack of concomitant reductions in DOPAC and HVA may be presynaptic dysfunction in Atg7-deficient mice.
“Until now, we did not clarify the reason, but one of the explanation may be presynaptic dysfunction in Atg7-deficient mice9.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [9] Friedman, L. G. et al. Disrupted autophagy leads to dopaminergic axon and dendrite degeneration and promotes presynaptic accumulation of alpha-synuclein and LRRK2 in the brain. J Neurosci 32, 7585–7593 (2012). source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationBedford et al. reported deposits of mitochondria in early LBs (pale bodies) in PD patients.
“and Bedford et al. also reported deposits of mitochondria in early LBs (pale bodies) in PD patients26.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [26] Bedford, L. et al. Depletion of 26S proteasomes in mouse brain neurons causes neurodegeneration and Lewy-like inclusions resembling human pale bodies. J Neurosci 28, 8189–8198 (2008). source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationElectron microscopic analysis by Gai et al. revealed that many mitochondria are concentrated in the early forms of LBs.
“Electron microscopic analysis by Gai et al. revealed that many mitochondria are concentrated in the early forms of LBs25”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [25] Gai, W. P. et al. In situ and in vitro study of colocalization and segregation of alpha-synuclein, ubiquitin, and lipids in Lewy bodies. Exp Neurol 166, 324–333 (2000). source
Not checked in the free run.
May combine two claims.
Interpretationown dataAtg7-deficient mice demonstrate typical Lewy pathology, including endogenous synuclein and neuronal loss, which resembles PD.
“Our Atg7-deficient mice demonstrate typical Lewy pathology, including endogenous synuclein and neuronal loss, which resembles PD.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim. May combine two claims.
PremisecitationDepolarized mitochondria are ubiquitylated by Parkin, recognized by p62, transported via microtubules to aggregates, and degraded by autophagy.
“During mitochondrial degradation in cultured cells, depolarized mitochondria cluster with p6224. Depolarized mitochondria are ubiquitylated by Parkin, recognized by p62, transported via microtubules to aggregates, and degraded by autophagy.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [24] Okatsu, K. et al. p62/SQSTM1 cooperates with Parkin for perinuclear clustering of depolarized mitochondria. Genes Cells 15, 887–900 (2010). source
Not checked in the free run.
The paper relies on this without support.
The relationship between impaired autophagy and Lewy body formation and the in vivo process of formation remains unknown.
“Inactivation of constitutive autophagy results in the formation of cytoplasmic inclusions in neurons, but the relationship between impaired autophagy and Lewy bodies (LBs) as well as the in vivo process of formation remains unknown.”
The paper relies on this without support.
In DA neurons, no detailed reports to date have examined endogenous synuclein accumulation in dopaminergic cell bodies and neurites associated with Lewy pathology.
“In DA neurons, the primary site of endogenous pathology, no detailed reports to date have examined the endogenous synuclein accumulation in dopaminergic cell bodies and neurites, which is associated with Lewy pathology.”
The paper relies on this without support.
The mechanisms underlying age-related progression and intracellular localization of p62 inclusions in dopaminergic neurons remain elusive.
“However, the mechanisms underlying age-related progression and intracellular localization of these inclusions in dopaminergic neurons remain elusive.”
The paper relies on this without support.
It remained unclear how synuclein accumulation is associated with PD pathology.
“Previous in vivo analysis of DA neurons suggested that synuclein regulation is linked to autophagy9,15, but it remained unclear how synuclein accumulation is associated with PD pathology.”
The paper relies on this without support.
Most genetically modified mouse PD models do not exhibit neuronal loss.
“To date, many genetically modified mice have been developed as PD models, but most of them do not exhibit neuronal loss.”
The paper relies on this without support.
None of the current genetic PD models in mouse recapitulates all features of PD.
“None of the current genetic PD models in mouse recapitulates all features of PD.”
The paper relies on this without support.
Only a few genetic PD models develop mild DA neurodegeneration.
“Additionally, only a few of these models develop mild DA neurodegeneration.”
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?
Autophagy impairment has been strongly linked to the degeneration of SNpc DA neurons in PD.
“In support of the importance of the autophagic process in DA neurons, autophagy impairment has been strongly linked to the degeneration of SNpc DA neurons in PD (Hunn et al., 2019; Isidoro et al., 2009; Sato et al., 2018)”
From Nilotinib restores memory function by preventing dopaminergic neuron degeneration in a mouse model of Alzheimer’s Disease (2021) · cites this paper as Sato et al., 2018
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Conflicting reports of dopamine metabolite reductions
MajorThe Results state that DOPAC and HVA levels were reduced in knockout mice, but the Discussion says the dopamine decrease was not accompanied by reductions in those metabolites.
“High-performance liquid chromatography (HPLC) revealed a reduction in striatal DA levels and metabolites in Atg7flox/flox:TH-Cre versus control mice (Fig. 4C).”
“Intriguingly, the significant decrease in dopamine is not accompanied by concomitant reductions in the dopamine catabolites DOPAC and HVA.”
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Autophagy in health and disease: From molecular mechanisms to therapeutic target
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BackgroundAutophagy as a Cellular Stress Response Mechanism in the Nervous System
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“In animal models inhibition of autophagy in dopaminergic neurons causes protein aggregation and progressive neuronal loss, leading to decrease in dopamine levels and age-dependent motor deficits [7,8].”
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“To address this, several research groups have examined the effects of neuron-specific deletion of Atg7 in -synuclein in vivo (6, 68, 69).”
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Prolyl oligopeptidase inhibition activates autophagy via protein phosphatase 2A
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p62: Friend or Foe? Evidences for OncoJanus and NeuroJanus Roles
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“For instance, loss of p62-dependent autophagy in neurons was associated with Lewy pathology and motor dysfunction in aged mice [111].”
Therapeutic Effects of Catechins in Less Common Neurological and Neurodegenerative Disorders
Sebastiani, G., Almeida-Toledano, L., Serra-Delgado, M., Navarro‐Tapia, E., Sailer, S., Valverde, O., García‐Algar, Ó., & Andreu-Férnández, V. (2021) · Nutrients · doi:10.3390/nu13072232 · Cited by 47 · see citing works
“Aging is associated with dysfunction of the autophagy activity, which protects neuronal cells by recycling obsolete cellular constituents and removing protein aggregates, contributors to neurodegenerative disorders, such as PD [40,41].”
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Living with the enemy: from protein-misfolding pathologies we know, to those we want to know
Emwas, A.-H. M., Alghrably, M., Dhahri, M., Sharfalddin, A. A., Alsiary, R., Jaremko, M., Faa, G., Campagna, M., Congiu, T., Piras, M., et al. (2021) · Ageing Research Reviews · doi:10.1016/j.arr.2021.101391 · Cited by 43 · see citing works
“In an aged mouse model, Sato et al. showed that ATG7-knockout leads to dopamine neuron loss and motor dysfunction as a result of the increasing formation of inclusions consisting of α-syn and p62, the autophagy adaptor protein, with age (Sato et al., 2018).”
Spermidine as an epigenetic regulator of autophagy in neurodegenerative disorders
Satarker, S., Wilson, J., Kolathur, K. K., Mudgal, J., Lewis, S. A., Arora, D. S., & Nampoothiri, M. (2024) · European Journal of Pharmacology · doi:10.1016/j.ejphar.2024.176823 · Cited by 43 · see citing works
Homeostatic p62 levels and inclusion body formation in CHCHD2 knockout mice
Sato, S., Noda, S., Torii, S., Amo, T., Ikeda, A., Funayama, M., Yamaguchi, J., Fukuda, T., Kondo, H., Tada, N., et al. (2021) · Human Molecular Genetics · doi:10.1093/hmg/ddab057 · Cited by 38 · see citing works
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“Additionally, abnormal proteins can directly or indirectly disrupt UPS processes, further impairing associated pathways and ultimately leading to irreversible neuronal protein imbalance and degeneration (Cookson, 2009; Sato et al., 2018).”
Role of melatonin in TLR4-mediated inflammatory pathway in the MTPT-induced mouse model
Yıldırım, S., Özkan, A., Aytaç, G., Ağar, A., & Tanrιöver, G. (2021) · NeuroToxicology · doi:10.1016/j.neuro.2021.11.011 · Cited by 36 · see citing works
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“In fact, genetically inactivating autophagy in murine models reproduces both psychiatric alterations and key features of neurodegeneration; rescuing autophagy improves behavior and provides neuroprotection instead (Feng et al., 2020; Hara et al., 2006; Hu et al., 2017; Hui and Tanaka, 2019; Komatsu et al., 2006, 2007;…”
BackgroundInfluentialAutophagy and lysosomal pathways in nervous system disorders
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“Indeed, impaired autophagic clearance leads to deposition of aSyn in presynaptic terminals of mice lacking Atg7, supporting the hypothesis that synapses are a major target of aSyn pathology [29,30].”
BackgroundPitcairn, C., Murata, N., Zalon, A. J., Stojkovska, I., & Mazzulli, J. R. (2023) · Journal of Neuroscience · doi:10.1523/jneurosci.0610-22.2023 · Cited by 29 · see citing works
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Cell Clearing Systems Bridging Neuro-Immunity and Synaptic Plasticity
Limanaqi, F., Biagioni, F., Busceti, C. L., Ryskalin, L., Soldani, P., Frati, A., & Fornai, F. (2019) · International Journal of Molecular Sciences · doi:10.3390/ijms20092197 · Cited by 28 · see citing works
Macroautophagy and Mitophagy in Neurodegenerative Disorders: Focus on Therapeutic Interventions
Magalhães, J. D., Fão, L., Vilaça, R., Cardoso, S. M., & Rego, A. C. (2021) · Biomedicines · doi:10.3390/biomedicines9111625 · Cited by 27 · see citing works
“For example, specific ablation of ATG7, essential for autophagosome elongation in dopaminergic neurons from aged mice, induces characteristic PD features, such as motor frailty, loss of TH-positive neurons, and aSyn deposition [208].”
BackgroundAutophagy and Redox Homeostasis in Parkinson’s: A Crucial Balancing Act
Jiménez-Moreno, N., & Lane, J. D. (2020) · Oxidative Medicine and Cellular Longevity · doi:10.1155/2020/8865611 · Cited by 26 · see citing works
“In the absence of autophagy in dopaminergic neurons (in Atg7 knockout mice), inclusions containing αsyn and p62/SQSTM1 are observed predominantly in neurites, and these increase with age, preempting neurodegeneration and motor dysfunction [96].”
BackgroundATG8-dependent LMX1B-autophagy crosstalk shapes human midbrain dopaminergic neuronal resilience
Jiménez-Moreno, N., Kollareddy, M., Stathakos, P., Moss, J. J., Antón, Z., Shoemark, D. K., Sessions, R. B., Witzgall, R., Caldwell, M. A., & Lane, J. D. (2023) · The Journal of Cell Biology · doi:10.1083/jcb.201910133 · Cited by 25 · see citing works
Real-state of autophagy signaling pathway in neurodegenerative disease; focus on multiple sclerosis
Hassanpour, M., Hajihassani, F., Hiradfar, A., Aghamohammadzadeh, N., Rahbarghazi, R., Safaie, N., Nouri, M., & Panahi, Y. (2020) · Journal of Inflammation · doi:10.1186/s12950-020-0237-8 · Cited by 20 · see citing works
Zuo, L., Dai, C., Yi, L., & Dong, Z. (2021) · Cell Death Discovery · doi:10.1038/s41420-021-00643-5 · Cited by 24 · see citing works
Dementia associated with disorders of the basal ganglia
Vitanova, K. S., Stringer, K. M., Benítez, D. P., Brenton, J., & Cummings, D. M. (2019) · Journal of Neuroscience Research · doi:10.1002/jnr.24508 · Cited by 23 · see citing works
Zhang, Z., Guo, P., Huang, S., Jia, Z., Chen, T., Liu, X. B., Feng, H., & Chen, Y. (2022) · Oxidative Medicine and Cellular Longevity · doi:10.1155/2022/4177317 · Cited by 22 · see citing works
“Much of the evidence to support this derives from studies adjusting autophagy in neurons and observing neurodegeneration, especially in AD and PD [48 – 50].”
Impaired mitochondrial accumulation and Lewy pathology in neuron-specific FBXO7-deficient mice
Noda, S., Sato, S., Fukuda, T., Ueno, S., Tada, N., & Hattori, N. (2022) · Molecular Brain · doi:10.1186/s13041-022-00936-5 · Cited by 20 · see citing works
Self-citationMSA: From basic mechanisms to experimental therapeutics
Heras‐Garvin, A., & Stefanova, N. (2020) · Parkinsonism & Related Disorders · doi:10.1016/j.parkreldis.2020.01.010 · Cited by 20 · see citing works
Autophagy status as a gateway for stress-induced catecholamine interplay in neurodegeneration
Fornai, F., & Puglisi‐Allegra, S. (2021) · Neuroscience & Biobehavioral Reviews · doi:10.1016/j.neubiorev.2021.01.015 · Cited by 20 · see citing works
LRRK2 along the Golgi and lysosome connection: a jamming situation
Piccoli, G., & Volta, M. (2021) · Biochemical Society Transactions · doi:10.1042/bst20201146 · Cited by 18 · see citing works
Sukseree, S., László, L., Грубер, Ф., Bergmann, S., Narzt, M., Nagelreiter, I., Höftberger, R., Molnár, K., Rauter, G., Birngruber, T., et al. (2018) · Molecular Neurobiology · doi:10.1007/s12035-018-0996-x · Cited by 17 · see citing works
Oizumi, H., Yamasaki, K., Suzuki, H., Ohshiro, S., Saito, Y., Murayama, S., Sugimura, Y., Hasegawa, T., Fukunaga, K., & Takeda, A. (2022) · Annals of Clinical and Translational Neurology · doi:10.1002/acn3.51610 · Cited by 14 · see citing works
“To detect cytoplasmic autophagy-associated proteins, rabbit anti-p62/SQSTM1 polyclonal antibodies (1:100, ProteinTech, Rosemont, IL) were used.(20) The sections were double-immunostained overnight with combinations of primary antibodies: (1) Mouse anti-p-aSyn (1:1000 dilution) and rabbit anti-DBH (1:100 dilution), (2)…”
BackgroundMethodSebti, S., Zou, Z., & Shiloh, M. U. (2022) · Autophagy · doi:10.1080/15548627.2022.2111852 · Cited by 14 · see citing works
Pinelli, R., Biagioni, F., Limanaqi, F., Bertelli, M., Scaffidi, E., Polzella, M., Busceti, C. L., & Fornai, F. (2020) · International Journal of Molecular Sciences · doi:10.3390/ijms21155563 · Cited by 14 · see citing works
Dopaminergic Neuron-Specific Autophagy-Deficient Mice
Sato, S., & Hattori, N. (2018) · Methods in molecular biology · doi:10.1007/7651_2018_156 · Cited by 14 · see citing works
Self-citationYao, L., Yang, Y., Yang, X., & Rezaei, M. J. (2024) · Molecular Neurobiology · doi:10.1007/s12035-024-04151-2 · Cited by 13 · see citing works
“The presence of anti-synuclein staining in the SN is associated with motor dysfunction [45].”
Association of ATG5 gene polymorphism with Parkinson’s disease in a Han Chinese population
Han, J., Feng, G., Wu, J., Zhang, Y., Long, Z., & Yao, X. (2021) · Acta Neurologica Belgica · doi:10.1007/s13760-021-01814-y · Cited by 13 · see citing works
Clearance Pathways for α‐Synuclein in Parkinson's Disease
Ho, M. S.-C. (2025) · Journal of Neurochemistry · doi:10.1111/jnc.70124 · Cited by 13 · see citing works
“Conditional deletion of Atg7 in DA neurons leads to the accumulation of ubiquitinated inclusions and age-dependent neurodegeneration (Hunn et al. 2019; Sato et al. 2018; Friedman et al. 2012).”
MicroRNAs regulating autophagy: opportunities in treating neurodegenerative diseases
Mohseni, M., Behzad, G., Farhadi, A., Behroozi, J., Mohseni, H., & Valipour, B. (2024) · Frontiers in Neuroscience · doi:10.3389/fnins.2024.1397106 · Cited by 12 · see citing works
Jo, Y. R., Kim, H. R., Jang, S. Y., Go, H., Song, M., Park, D. K., Oh, Y., Jo, J.-Y., Shin, Y. K., Lee, S. J., et al. (2020) · The FASEB Journal · doi:10.1096/fj.202001366rr · Cited by 10 · see citing works
Wise, J. P., Price, C. G., Amaro, J. A., & Cannon, J. R. (2018) · Frontiers in Neuroscience · doi:10.3389/fnins.2018.00289 · Cited by 11 · see citing works
“In their report, these autophagy-deficient mice exhibited behavior and pathology in LC and SNpc akin to other PD models (Sato et al., 2018).”
BackgroundResultIdentifying Disease Signatures in the Spinocerebellar Ataxia Type 1 Mouse Cortex
Luttik, K. P., Olmos, V., Owens, A., Khan, A., Yun, J., Driessen, T. M., & Lim, J. (2022) · Cells · doi:10.3390/cells11172632 · Cited by 9 · see citing works
“The functional impact of this colocalization is of interest, especially given that the regulation and role of p62 has been quite well studied in other neurodegenerative disease, including Alzheimer’s disease (AD) [49], Parkinson’s disease (PD) [50,51],”
BackgroundAre Proteinopathy and Oxidative Stress Two Sides of the Same Coin?
Mehta, N. J., Marwah, P. K., & Njus, D. (2019) · Cells · doi:10.3390/cells8010059 · Cited by 10 · see citing works
“For example, p62 has been reported in α-synuclein deposits in neuron-specific autophagy-deficient mice [24].”
BackgroundAutophagic signatures in peripheral blood mononuclear cells from Parkinson's disease patients
Lee, M. S., Kim, J. W., Park, D. G., Heo, H., Kim, J., Yoon, J. H., & Chang, J. (2024) · Molecules and Cells · doi:10.1016/j.mocell.2024.100173 · Cited by 8 · see citing works
The regulation of microglia by aging and autophagy in multiple sclerosis
Wang, X., Sun, Y., Yu, H., Xue, C., Pei, X., Chen, Y., & Guan, Y. (2025) · Pharmacological Research · doi:10.1016/j.phrs.2025.107786 · Cited by 11 · see citing works
Moudio, S., Rodin, F., Albargothy, N. J., Karlsson, U., Reyes, J. F., & Hallbeck, M. (2022) · Frontiers in Neurology · doi:10.3389/fneur.2022.826102 · Cited by 10 · see citing works
“Moreover, we also detected direct co-localization between α-synuclein inclusions and p62 proteins indicating impaired autophagic turnover, further contributing to an increase in cellular toxicity and cell death as previously described (41, 49, 50, 53).”
Zhang, J., Fu, Z., Wen, F., Lyu, P., Huang, S., Cai, X., Zhang, Z., Zhang, Y., Fan, C. C., Man, W., et al. (2025) · Journal of Neurophysiology · doi:10.1152/jn.00497.2024 · Cited by 9 · see citing works
Pathogenic insights to Parkin-linked model mice
Sato, S., Noda, S., & Hattori, N. (2020) · Neuroscience Research · doi:10.1016/j.neures.2020.03.014 · Cited by 8 · see citing works
Self-citationNoda, S., Sato, S., Yamakado, H., Takahashi, R., & Hattori, N. (2025) · Biochemical and Biophysical Research Communications · doi:10.1016/j.bbrc.2025.151514 · Cited by 7 · see citing works
Self-citationMa, C., Wei, X., Wang, F., Zhang, T., Jiang, Y., Meng, Z., & Zhang, Z. (2023) · Neuroscience Letters · doi:10.1016/j.neulet.2023.137223 · Cited by 8 · see citing works
Ferrucci, M., Lenzi, P., Lazzeri, G., et al. (2024) · Journal of Neural Transmission · doi:10.1007/s00702-024-02741-x · Cited by 7 · see citing works
Lenzi, P., Lazzeri, G., Ferrucci, M., Scotto, M., Frati, A., Puglisi‐Allegra, S., Busceti, C. L., & Fornai, F. (2024) · International Journal of Molecular Sciences · doi:10.3390/ijms25073929 · Cited by 7 · see citing works
“Apart from lipid membranes, other proteins than alpha-syn are now claimed as potential seeds of LBs, which confirms that the catalytic role of alpha-syn as a building block to start neuronal inclusions is debatable [11,15,16].”
BackgroundResultRepairing the Brain: Gene Therapy
Björklund, T. (2018) · Journal of Parkinson s Disease · doi:10.3233/jpd-181485 · Cited by 7 · see citing works
“Macroautophagy is impaired with aging and with its decrease comes protein aggregation and neurodegeneration [70, 71].”
BackgroundHo, D. H., Nam, D., Jeong, S., Seo, M. K., Park, S. W., Seol, W., & Son, I. (2021) · Neurobiology of Disease · doi:10.1016/j.nbd.2021.105349 · Cited by 7 · see citing works
Mantas, I., Contestabile, A., Skara, V., Loiseau, C., Santos, I., Cramb, K. M. L., Filograna, R., Wade‐Martins, R., Magill, P. J., & Meletis, K. (2024) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/2024.12.22.629963 · Cited by 10 · see citing works
Gait analysis in swine, sheep, and goats after neurologic injury: a literature review
Sveum, J. W., Mishra, R. R., Marti, T. L., et al. (2023) · Neural Regeneration Research · doi:10.4103/1673-5374.367839 · Cited by 6 · see citing works
“The rotarod is a rotating cylinder which the animal must run on to avoid falling (Farr et al., 2006; Navarro et al., 2012; Imani et al., 2016; Sato et al., 2018).”
BackgroundEmerging Promise of Phytochemicals in Ameliorating Neurological Disorders
Jayaraman, M., Dutta, P., B., S. K. B., Arora, K., Sivakumar, D., & Raghavendran, H. R. B. (2022) · CNS & Neurological Disorders - Drug Targets · doi:10.2174/1871527321666220701153926 · Cited by 6 · see citing works
In vitro modulation of mTOR and mGlur5 influence α-synuclein accumulation
Xing, V., Biggar, K. K., Ferguson, S. S. G., & Hayley, S. P. (2024) · Molecular Brain · doi:10.1186/s13041-023-01074-2 · Cited by 6 · see citing works
“Parkinson’s disease (PD) is associated with the accumulation of pathological proteinaceous inclusions, referred to as Lewy bodies [4, 9, 34, 36, 38].”
BackgroundRelating aging and autophagy – a new perspective towards the welfare of human health
Chowdhury, S. G., Ray, R., & Karmakar, P. (2023) · EXCLI journal · doi:10.17179/excli2023-6300 · Cited by 6 · see citing works
Abubakar, M., Alom, S., Ali, F., Ali, S. R., Adhikary, K., Sarika, S., Gupta, P. K., Puppala, E. R., Murti, K., Nand, S., et al. (2026) · Current Neuropharmacology · doi:10.2174/011570159x446831260303200516 · Cited by 7 · see citing works
“Several internal monitoring systems are in place to ensure protein homeostasis, including the chaperone-mediated process, the ubiquitin-proteasome system, and the autophagy system, which enable the rapid identification and processing or removal of altered proteins [165, 166].”
Lenzi, P., Lazzeri, G., Ferrucci, M., Busceti, C. L., Puglisi‐Allegra, S., & Fornai, F. (2024) · Journal of Neural Transmission · doi:10.1007/s00702-024-02795-x · Cited by 5 · see citing works
Iron‐inhibited autophagy via transcription factor ZFP27 in Parkinson's disease
Wang, Y., Wen, Q., Chen, R., Gan, Z., Huang, X., Wang, P., Cao, X., Zhao, N., Yang, Z., & Yan, J. (2023) · Journal of Cellular and Molecular Medicine · doi:10.1111/jcmm.17946 · Cited by 4 · see citing works
“PD continues to be a world challenge for ageing population due to its 48,49 However, activated autophagy may be detrimental when numerous undergraded autophagic vacuoles accumulate in neurodegenerative diseases.”
BackgroundAutophagosome marker, LC 3, is released extracellularly via several distinct pathways
Saito, K., Arakawa, M., Maeda, K., et al. (2025) · FEBS Open Bio · doi:10.1002/2211-5463.70150 · Cited by 4 · see citing works
“Disruption of this molecular mechanism of intracellular homeostasis has been linked to the development of neurodegenerative diseases, cancer, bacterial infections, and inflammatory conditions [17 – 21].”
Morphology, clearing efficacy, and mTOR dependency of the organelle autophagoproteasome
Limanaqi, F., Biagioni, F., Salvetti, A., Puglisi‐Allegra, S., Lenzi, P., & Fornai, F. (2021) · European Journal of Histochemistry · doi:10.4081/ejh.2021.3220 · Cited by 4 · see citing works
Sequestosome-1 (SQSTM1/p62) as a target in dopamine catabolite-mediated cellular dyshomeostasis
Masato, A., Andolfo, A., Favetta, G., Bellini, E. N., Cogo, S., Valle, L. D., Boassa, D., Greggio, E., Plotegher, N., & Bubacco, L. (2024) · Cell Death and Disease · doi:10.1038/s41419-024-06763-x · Cited by 6 · see citing works
“In the context of PD, loss-of-function of p62 contributes to dysregulated proteasome-and autophagy-mediated protein degradation, leading to aberrant accumulation of misfolded proteins and dysfunctional organelles in dopaminergic neurons [15, 20, 21].”
BackgroundInhibition of DYRK1A can alleviate MPTP/MPP+-induced neuronal apoptosis and mitochondrial damage
Cai, Q., Xia, H., Li, P., Yao, Y., Luo, Q., & Yang, X. (2025) · Brain Research Bulletin · doi:10.1016/j.brainresbull.2025.111516 · Cited by 2 · see citing works
Mukhtar, S., Kataria, S., Cimaglia, G., & Beccano-Kelly, D. A. (2025) · Current Research in Physiology · doi:10.1016/j.crphys.2025.100166 · Cited by 2 · see citing works
“Furthermore, enhanced deposition of α -synuclein in LBs and in presynaptic terminals has been observed when there are deficits in autophagy and in Atg7 (cid:0) / (cid:0) mice, respectively (Friedman et al., 2012; Sato et al., 2018).”
Shimizu, T., Isik, S., Kamath, N., & Yue, Z. (2026) · Translational Neurodegeneration · doi:10.1186/s40035-026-00555-3 · Cited by 3 · see citing works
“…of intracellular accumulation of α-synuclein and formation of Lewy body-like inclusions in autophagy-deficient neurons support a potential role of autophagy in digesting large α-synuclein aggregates [31, 36, 100], the direct evidence of autophagy clearance of fibril through autophagy is lacking.”
Absence of motor impairments or pathological changes in TMEM230 knockout rats
Zhang, W., Peng, H., Yang, D., Song, G., He, J., Zhou, Y., Huang, C., & Huang, B. (2024) · Neuroscience Letters · doi:10.1016/j.neulet.2024.137921 · Cited by 2 · see citing works
“The loss of p62 in dopaminergic neurons causes Lewy pathology and motor dysfunction in aged mice, likely due to changes in several biological processes [29].”
BackgroundLIR-dependent LMX1A/LMX1B autophagy crosstalk shapes human midbrain dopaminergic neuronal resiliencePreprint
Jiménez-Moreno, N., Stathakos, P., Antón, Z., Shoemark, D. K., Sessions, R. B., Witzgall, R., Caldwell, M. A., & Lane, J. D. (2019) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/636712 · Cited by 2 · see citing works
- Authors
- Sato, S., Uchihara, T., Fukuda, T., Noda, S., Kondo, H., Saiki, S., Komatsu, M., Uchiyama, Y., Tanaka, K., & Hattori, N.
- Affiliations
- Juntendo University (JP)
- Tokyo Metropolitan Institute of Medical Science (JP)
- Jikei University School of Medicine (JP)
- Niigata University (JP)
- Corresponding author
- Sato, Shigeto
- Hattori, Nobutaka
- ORCID
- Venue
- Scientific Reports
- Published
- 2018-02-12
- Volume
- 8
- Issue
- 1
- Pages
- 2813-2813
- ISSN
- 2045-2322 (ISSN-L)
- PMC
- PMC5809579
- OpenAlex
- W2800535259
- Semantic Scholar
- 515cfb0f749654c17b9ffeb4dc295ee16d8ba92c
- Cited by
- 125
- References
- 29
- Citations by year
- 2026: 6 · 2025: 13 · 2024: 14 · 2023: 10 · 2022: 13 · 2021: 20 · 2020: 23 · 2019: 19 · 2018: 7
- FWCI
- 11.72
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Scientific Reports (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Japan Society for the Promotion of Science (25111006, 17H03555, 25111007, 17K07797, 15H04843, 18H04043, 26000014, 16K14572)
- Topics
- Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
- Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nuclear Receptors and Signaling
- Keywords
- autophagy, dopaminergic neurons, Lewy bodies, Parkinson's disease, synuclein, p62, neuronal inclusions, aging, motor impairment, autophagy-deficient mice, protein aggregation, neurodegeneration
- MeSH terms
- Animals, Autophagy, Brain, Inclusion Bodies, Disease Models, Animal, Parkinson Disease, Transcription Factors, Neurites, Lewy Bodies, Motor Skills Disorders, Mice, Transcription Factor TFIIH, Synucleins, Dopaminergic Neurons
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