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Depletion of the AD Risk Gene SORL1 Selectively Impairs Neuronal Endosomal Traffic Independent of Amyloidogenic APP Processing

Knupp, Allison, Mishra, Swati, Martinez, Refugio, Braggin, Jacquelyn E., Szabo, Marcell, Kinoshita, Chizuru, Hailey, Dale W., Small, Scott A., Jayadev, Suman, Young, Jessica E.·2020·Cell Reports

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Crossref · 10.1016/j.celrep.2020.107719

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  • Loss of SORLA causes endo-lysosomal defects in neurons, including in endosomal recycling, autophagy, and lysosome function, resulting in increased secretion of toxic Aβ species and impaired synaptic activity.

    “Studies investigating the role of SORLA in ad pathogenesis have extensively focused on neurons and revealed that loss of SORLA causes endo‐lysosomal defects in neurons, specifically in endosomal recycling, autophagy, and lysosome function, ultimately resulting in increased secretion of toxic Aβ species and impaired synaptic activity in neurons (Andersen et al. 2022; Hung et al. 2021; Knupp et al.”

    From The Alzheimer's Disease Gene SORL1 Regulates Lysosome Function in Human Microglia (2025) · cites this paper as Knupp et al. 2020

    The Introduction and the section on APP trafficking report enlarged endosomes and altered APP transport in SORL1-deficient neurons. The APP-processing section reports increased secretion of Aβ1–40 and Aβ1–42. The paper does not establish the claimed defects in autophagy, lysosome function, or synaptic activity, nor does it test whether the secreted Aβ is toxic; its trafficking findings also do not specifically establish impaired endosomal recycling. Page numbers were not available in our copy. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Depletion of SORLA in neurons leads to enlarged early endosomes, impairments in endo-lysosomal trafficking, changes in gene expression, and impaired neuronal function.

    “Recent work from our group and others has shown that depletion of SORLA in neurons leads to enlarged early endosomes, impairments in endo‐lysosomal trafficking, changes in gene expression, and impaired neuronal function (Hung et al. 2021; Knupp et al. 2020; Lee et al. 2023; Mishra et al. 2023, 2022).”

    From The Alzheimer's Disease Gene SORL1 Regulates Lysosome Function in Human Microglia (2025) · cites this paper as Knupp et al. 2020

    The Results sections on endosome size and APP trafficking (page numbers unavailable) report enlarged early endosomes and altered endo-lysosomal trafficking in SORL1-deficient neurons. The passages do not establish the attributed changes in gene expression or impaired neuronal function; searches for those outcomes found no supporting results in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • SORLA deletion as well as AD-associated Y1816C, G511R, E270K and Y141C variants can promote endosomal enlargement and dysregulated trafficking of targets such as APP and GLUA1 in iPSC-derived neurons.

    “SORLA deletion as well as AD-associated Y1816C, G511R, E270K and Y141C variants can promote endosomal enlargement (Knupp, Mishra et al. 2020, Hung, Tuck et al. 2021, Mishra, Knupp et al. 2023, Jensen, Raska et al. 2024) and dysregulated trafficking of targets such as APP and GLUA1 in iPSC-derived neurons (Mishra, Knupp et al. 2022).”

    From SORLA up-regulation suppresses pathological effects in aged tauopathy mouse brain (2026) · cites this paper as Knupp, Mishra et al. 2020

  • We did not observe differences in the size of early endosomes between SORL1 WT and SORL1 KO hMGLs.

    “We did not observe differences in the size of early endosomes between SORL1 WT and SORL1 KO hMGLs (Knupp et al. 2020) but have documented lysosomal enlargement in SORL1 KO microglia (Mishra 2024).”
  • SORLA deletion results in endosomal and lysosomal defects in iPSC-derived neurons.

    “Previous groups have reported that SORLA deletion results in endosomal (Knupp, Mishra et al. 2020, Hung, Tuck et al. 2021), as well as lysosomal defects (Hung, Tuck et al. 2021) in iPSC-derived neurons.”

    From SORLA up-regulation suppresses pathological effects in aged tauopathy mouse brain (2026) · cites this paper as Knupp, Mishra et al. 2020

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Research works printed but not linked: 40

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Metadata

Authors
Knupp, A., Mishra, S., Martinez, R., Braggin, J. E., Szabo, M., Kinoshita, C., Hailey, D. W., Small, S. A., Jayadev, S., & Young, J. E.
Venue
Cell Reports
Publisher
Elsevier BV
Published
2020-06
Volume
31
Issue
9
Pages
107719
ISSN
2211-1247
Cited by
165
References
14
Language
en
Funders
  • BrightFocus Foundation (A2018656S, T32AG052354)
  • National Institutes of Health (R01AG062148, T32AG052354)

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