Signal transducer and activator of transcription 5a mediates mammary ductal branching and proliferation in the nulliparous mouse.

ABSTRACT: Signal transducer and activator of transcription (Stat)5a is a critical regulator of mammary gland development. Previous studies have focused on Stat5a's role in the late pregnant and lactating gland, and although active Stat5a is detectable in mammary epithelial cells in virgin mice, little is known about its role during early mammary gland development. In this report, we compare mammary gland morphology in pubertal and adult nulliparous wild-type and Stat5a-/- mice. The Stat5a-null mammary glands exhibited defects in secondary and side branching, providing evidence that Stat5a regulates these processes. In addition, Stat5a-/- mammary glands displayed an attenuated proliferative response to pregnancy levels of estrogen plus progesterone (E+P), suggesting that it plays an important role in

SUBMITTER: Santos SJ 

PROVIDER: S-EPMC2875824 | biostudies-literature | 2010 Jun

REPOSITORIES: biostudies-literature