Bcl11a preserves hematopoietic stem cell function in culture by restraining Ncf1-dependent ROS.

Bcl11a downregulation during hematopoietic stem cell culture is linked to functional deterioration, and restoring Bcl11a preserves quiescence and serially transplantable HSC activity.

• Why it matters: Ex vivo HSC expansion is constrained by culture-induced oxidative stress, but the upstream transcriptional regulators that connect redox control to HSC function are not well defined.
• What they did: The authors tested whether Bcl11a is required and sufficient in HSCs, mapped its direct repression of a Nox2/Ncf1 NADPH oxidase module, and used Ncf1 deletion plus rapamycin or N-acetylcysteine to probe ROS and function.
• The result: Ncf1 deletion reduced ROS and partially rescued Bcl11a-deficient defects, while rapamycin (not N-acetylcysteine) suppressed Ncf1 and ROS and improved HSC function, suggesting a conserved, druggable Bcl11a–Ncf1 redox axis in human HSPCs.

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