Niche signaling promotes stem cell survival in the Drosophila testis via the JAK-STAT target DIAP1

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Salman Hasan1, Phylis Hétié1, Erika L Matunis1

  • 1Department of Cell Biology, Johns Hopkins University School of Medicine, 725 N Wolfe Street, Baltimore, MD 21205, USA.

Developmental Biology
|May 6, 2015
PubMed

Insights

Drosophila stem cells resist cell death better than differentiating cells. This survival is mediated by the anti-apoptotic gene DIAP1, a JAK-STAT target, highlighting niche signals that promote stem cell resilience.

Area of Science:

  • Stem cell biology
  • Developmental biology
  • Cell death regulation

Background:

  • Tissue-specific stem cells exhibit differential resistance to environmental insults compared to their differentiated progeny.
  • Mechanisms underlying stem cell resistance to cell death are not fully understood across different tissues.
  • The Drosophila testis niche, containing germline stem cells (GSCs) and somatic cyst stem cells (CySCs), serves as a model to study stem cell survival.

Purpose of the Study:

  • To investigate the mechanisms of cell death resistance in Drosophila testis stem cells.
  • To identify factors promoting stem cell survival within the testicular niche.
  • To characterize the role of the anti-apoptotic gene Drosophila inhibitor of apoptosis 1 (diap1) in stem cell survival.

Main Methods:

  • Utilized the Drosophila testis as a model system to study stem cell niche dynamics.
  • Assessed cell death responses in germline stem cells (GSCs) and somatic cyst stem cells (CySCs) under various conditions (normal, irradiation, starvation).
  • Investigated the expression and function of the anti-apoptotic gene diap1 in testis stem cells, including its regulation by the JAK-STAT pathway.

Main Results:

  • Both GSCs and CySCs demonstrated enhanced resistance to cell death compared to their differentiating progeny under normal and stress conditions.
  • DIAP1 protein was found to be enriched in GSCs and CySCs and identified as a JAK-STAT pathway target.
  • Loss of diap1 compromised the survival of both GSCs and CySCs, while its ectopic upregulation in somatic cells rescued stress-induced death in adjacent germ cells.

Conclusions:

  • Niche signals promote stem cell survival through the upregulation of conserved anti-apoptotic proteins like DIAP1.
  • The JAK-STAT pathway plays a role in regulating DIAP1 expression in testis stem cells.
  • This mechanism of niche-mediated survival via anti-apoptotic factors may be a general strategy for stem cell resistance to death.
Keywords:
DIAP1Drosophila spermatogenesisJAK–STAT signalingStem cell niche

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