Cargando…

Piwi reduction in the aged niche eliminates germline stem cells via Toll-GSK3 signaling

Transposons are known to participate in tissue aging, but their effects on aged stem cells remain unclear. Here, we report that in the Drosophila ovarian germline stem cell (GSC) niche, aging-related reductions in expression of Piwi (a transposon silencer) derepress retrotransposons and cause GSC lo...

Descripción completa

Detalles Bibliográficos
Autores principales: Lin, Kun-Yang, Wang, Wen-Der, Lin, Chi-Hung, Rastegari, Elham, Su, Yu-Han, Chang, Yu-Tzu, Liao, Yung-Feng, Chang, Yi-Chieh, Pi, Haiwei, Yu, Bo-Yi, Chen, Shu-Hwa, Lin, Chung-Yen, Lu, Mei-Yeh, Su, Tsu-Yi, Tzou, Fei-Yang, Chan, Chih-Chiang, Hsu, Hwei-Jan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7305233/
https://www.ncbi.nlm.nih.gov/pubmed/32561720
http://dx.doi.org/10.1038/s41467-020-16858-6
Descripción
Sumario:Transposons are known to participate in tissue aging, but their effects on aged stem cells remain unclear. Here, we report that in the Drosophila ovarian germline stem cell (GSC) niche, aging-related reductions in expression of Piwi (a transposon silencer) derepress retrotransposons and cause GSC loss. Suppression of Piwi expression in the young niche mimics the aged niche, causing retrotransposon depression and coincident activation of Toll-mediated signaling, which promotes Glycogen synthase kinase 3 activity to degrade β-catenin. Disruption of β-catenin-E-cadherin-mediated GSC anchorage then results in GSC loss. Knocking down gypsy (a highly active retrotransposon) or toll, or inhibiting reverse transcription in the piwi-deficient niche, suppresses GSK3 activity and β-catenin degradation, restoring GSC-niche attachment. This retrotransposon-mediated impairment of aged stem cell maintenance may have relevance in many tissues, and could represent a viable therapeutic target for aging-related tissue degeneration.