Integrins control the positioning and proliferation of follicle stem cells in the Drosophila ovary

AM O'Reilly, HH Lee, MA Simon - The Journal of cell biology, 2008 - rupress.org
AM O'Reilly, HH Lee, MA Simon
The Journal of cell biology, 2008rupress.org
Adult stem cells are maintained in specialized microenvironments called niches, which
promote self-renewal and prevent differentiation. In this study, we show that follicle stem
cells (FSCs) in the Drosophila melanogaster ovary rely on cues that are distinct from those of
other ovarian stem cells to establish and maintain their unique niche. We demonstrate that
integrins anchor FSCs to the basal lamina, enabling FSCs to maintain their characteristic
morphology and position. Integrin-mediated FSC anchoring is also essential for proper …
Adult stem cells are maintained in specialized microenvironments called niches, which promote self-renewal and prevent differentiation. In this study, we show that follicle stem cells (FSCs) in the Drosophila melanogaster ovary rely on cues that are distinct from those of other ovarian stem cells to establish and maintain their unique niche. We demonstrate that integrins anchor FSCs to the basal lamina, enabling FSCs to maintain their characteristic morphology and position. Integrin-mediated FSC anchoring is also essential for proper development of differentiating prefollicle cells that arise from asymmetrical FSC divisions. Our results support a model in which FSCs contribute to the formation and maintenance of their own niche by producing the integrin ligand, laminin A (LanA). Together, LanA and integrins control FSC proliferation rates, a role that is separable from their function in FSC anchoring. Importantly, LanA-integrin function is not required to maintain other ovarian stem cell populations, demonstrating that distinct pathways regulate niche–stem cell communication within the same organ.
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