Pot1a maintains mesenchymal stem cell niche function to support hematopoietic stem cells.

Pot1a loss in LepR+ mesenchymal stem cells reduces MSC numbers and impairs long-term hematopoietic reconstitution, linked to higher DDR/ROS and less HSC quiescence in knockout mice.

• Why it matters: Pot1a’s role in the LepR+ MSC niche component is unclear, despite evidence that telomere protection can preserve HSC function through niche-cell stress control.
• What they did: The study used LepR-specific Pot1a knockout mice and measured LepR+ MSC abundance, DDR and ROS, HSC quiescence, and long-term hematopoietic reconstitution; it also tested cell-permeable Pot1a on LepR+ MSCs and assessed Ptn expression.
• The result: Pot1a deficiency decreased Ptn expression and impaired hematopoietic support, while Pot1a enhancement increased LepR+ MSC hematopoietic-supporting function, suggesting Pot1a preserves niche function by limiting stress-associated changes and regulating PTN.

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