Abstract
Stem Cell Niche The stem cell niche is a complex local signaling microenvironment that regulates stem cell activity for tissue and organ maintenance and regeneration. As well as responding locally, during puberty, the mammary gland stem cell niche also responds to systemic hormonal signals. Zhao et al. have found that Gli2 , a transcriptional effector of Hedgehog signaling, coordinates the niche-signaling program and activates expression of receptors for the mammatrophic hormones estrogen and growth hormone throughout the mammary gland (see the Perspective by Robertson). Disease may result not only from stem cell defects, but also from dysregulation of the microenvironment. Science , this issue p. [eaal3485][1]; see also p. [250][2] [1]: /lookup/doi/10.1126/science.aal3485 [2]: /lookup/doi/10.1126/science.aan1506
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