A regulatory loop of JAK/STAT signalling and its downstream targets represses cell fate conversion and maintains male germline stem cell niche homeostasis

A specialised microenvironment, termed niche, provides extrinsic signals for the maintenance of residential stem cells. However, how residential stem cells maintain niche homeostasis and whether stromal niche cells could convert their fate into stem cells to replenish lost stem cells upon systemic s...

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Veröffentlicht in:Cell proliferation 2024-10, Vol.57 (10), p.e13648-n/a
Hauptverfasser: Kong, Ruiyan, Zhao, Hang, Li, Juan, Ma, Yankun, Li, Ningfang, Shi, Lin, Li, Zhouhua
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container_issue 10
container_start_page e13648
container_title Cell proliferation
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creator Kong, Ruiyan
Zhao, Hang
Li, Juan
Ma, Yankun
Li, Ningfang
Shi, Lin
Li, Zhouhua
description A specialised microenvironment, termed niche, provides extrinsic signals for the maintenance of residential stem cells. However, how residential stem cells maintain niche homeostasis and whether stromal niche cells could convert their fate into stem cells to replenish lost stem cells upon systemic stem cell loss remain largely unknown. Here, through systemic identification of JAK/STAT downstream targets in adult Drosophila testis, we show that Escargot (Esg), a member of the Snail family of transcriptional factors, is a putative JAK/STAT downstream target. esg is intrinsically required in cyst stem cells (CySCs) but not in germline stem cells (GSCs). esg depletion in CySCs results in CySC loss due to differentiation and non‐cell autonomous GSC loss. Interestingly, hub cells are gradually lost by delaminating from the hub and converting into CySCs in esg‐defective testes. Mechanistically, esg directly represses the expression of socs36E, the well‐known downstream target and negative regulator of JAK/STAT signalling. Finally, further depletion of socs36E completely rescues the defects observed in esg‐defective testes. Collectively, JAK/STAT target Esg suppresses SOCS36E to maintain CySC fate and repress niche cell conversion. Thus, our work uncovers a regulatory loop between JAK/STAT signalling and its downstream targets in controlling testicular niche homeostasis under physiological conditions. Esg suppresses the expression of SOCS36E, the downstream target and negative regulator of JAK/STAT signalling. Loss of esg leads to systemic CySC loss. Once the hub senses the systemic loss of CySCs, some hub cells are delaminated from the hub and converted into functional CySCs to replace the lost CySCs.
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subjects Animals
Cell cycle
Cell Differentiation
Cell fate
Cloning
Cysts
Delamination
Depletion
DNA methylation
Drosophila melanogaster - metabolism
Drosophila Proteins - genetics
Drosophila Proteins - metabolism
Germ Cells - cytology
Germ Cells - metabolism
Homeostasis
Insects
Janus Kinases - metabolism
Male
Microenvironments
Original
Physiology
Signal Transduction
Snail protein
STAT Transcription Factors - metabolism
Stem Cell Niche - physiology
Stem cells
Stem Cells - cytology
Stem Cells - metabolism
Suppressor of Cytokine Signaling Proteins
Testes
Testis - cytology
Testis - metabolism
Transcription factors
Transcription Factors - genetics
Transcription Factors - metabolism
title A regulatory loop of JAK/STAT signalling and its downstream targets represses cell fate conversion and maintains male germline stem cell niche homeostasis
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