Cited by 49Amyotrophic Lateral Sclerosis ResearchAlzheimer's disease research and treatmentsGenetic Neurodegenerative Diseases

Endogenous retroviruses and TDP-43 proteinopathy form a sustaining feedback driving intercellular spread of Drosophila neurodegeneration

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Chang, Yung-Heng, Dubnau, Josh·2023·Nature Communications

Abstract

Inter-cellular movement of “prion-like” proteins is thought to explain propagation of neurodegeneration between cells. For example, propagation of abnormally phosphorylated cytoplasmic inclusions of TAR-DNA-Binding protein (TDP-43) is proposed to underlie progression of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). But unlike transmissible prion diseases, ALS and FTD are not infectious and injection of aggregated TDP-43 is not sufficient to cause disease. This suggests a missing component of a positive feedback necessary to sustain disease progression. We demonstrate that endogenous retrovirus (ERV) expression and TDP-43 proteinopathy are mutually reinforcing. Expression of either Drosophila mdg4-ERV (gypsy) or the human ERV, HERV-K (HML-2) are each sufficient to stimulate cytoplasmic aggregation of human TDP-43. Viral ERV transmission also triggers TDP-43 pathology in recipient cells that express physiological levels of TDP-43, whether they are in contact or at a distance. This mechanism potentially underlies the TDP-43 proteinopathy-caused neurodegenerative propagation through neuronal tissue.

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  • Expression of HERV-K in SH-SY5Y cells is associated with reduced expression of Stathmin-2 (STMN2) and POLDIP3α, two established targets of TDP-43.

    “This is associated with reduced expression of Stathmin-2 (STMN2) and POLDIP3α, two established targets of TDP-43.”
  • Expression of HERV-K in SH-SY5Y human neuroblastoma cells is sufficient to trigger nuclear clearance of TDP-43 and accumulation of hyperphosphorylated pathological TDP-43 in the cytoplasm.

    “Expression of HERV-K in SH-SY5Y human neuroblastoma cells is sufficient to trigger nuclear clearance of TDP-43 and accumulation of hyperphosphorylated pathological TDP-43 in the cytoplasm (Chang & Dubnau 2023).”
  • mdg4-ERV expression in Drosophila S2 cells triggers the accumulation of cytoplasmic inclusions of hyperphosphorylated human TDP-43.

    “Similarly, mdg4-ERV expression in Drosophila S2 cells triggers the accumulation of cytoplasmic inclusions of hyperphosphorylated human TDP-43 (Chang & Dubnau 2023).”
  • Overexpression of human TDP-43 in Drosophila surface glia results in the accumulation of hyperphosphorylated human TDP-43 in nearby neurons, even though the neurons only express physiological levels of human TDP-43.

    “Overexpression of human TDP-43 in Drosophila surface glia results in the accumulation of hyperphosphorylated human TDP-43 in nearby neurons, even though the neurons only express physiological levels of human TDP-43 (Chang & Dubnau 2023).”
  • When human Drosophila S2 cells expressing human TDP-43 are grown in the presence of cells expressing a fluorescently tagged mdg4-ERV, they can become infected with the tagged ERV, triggering the loss of nuclear TDP-43 and the accumulation of cytoplasmic phosphorylated TDP-43 in the recipient cells.

    “When human Drosophila S2 cells expressing human TDP-43 are grown in the presence of cells expressing a fluorescently tagged mdg4-ERV, they can become infected with the tagged ERV, triggering the loss of nuclear TDP-43 and the accumulation of cytoplasmic phosphorylated TDP-43 in the recipient cells (Chang & Dubnau 2023).”

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Authors
Chang, Y.-H., & Dubnau, J.
Affiliations
Stony Brook School (US)
Corresponding author
  • Chang, Yung-Heng
  • Dubnau, Josh
Venue
Nature Communications
Published
2023-02-21
Volume
14
Issue
1
Pages
966-966
ISSN
2041-1723 (ISSN-L)
OpenAlex
W4321446819
Cited by
49
References
67
Citations by year
2026: 14 · 2025: 15 · 2024: 14 · 2023: 6
FWCI
8.34
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
U.S. Department of Health & Human Services | NIH | National Institute on Aging (R01AG078788, RF1AG076493, RF1AG057338)
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
Keywords
endogenous retroviruses, TDP-43 proteinopathy, intercellular spread, amyotrophic lateral sclerosis, frontotemporal dementia, prion-like proteins, positive feedback, HERV-K, TDP-43 aggregation, Drosophila
MeSH terms
Amyotrophic Lateral Sclerosis, Animals, DNA-Binding Proteins, Drosophila, Feedback, Humans, Endogenous Retroviruses, TDP-43 Proteinopathies, Frontotemporal Dementia

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