Expression of a carboxy terminally truncated Stat5 with no transactivation domain in the mammary glands of transgenic mice inhibits cell proliferation during pregnancy, delays onset of milk secretion, and induces apoptosis upon involution.

Abstract excerpt

Signal transducer and activator of transcription (Stat5) is a transcription factor, which transduces extracellular cytokine and growth-factor signals to the nuclei of mammalian cells. As a major mediator of prolactin action, it is involved in the regulation of the development, function, and survival of mammary epithelial cells. The carboxyl terminal of Stat5 encodes a transactivation domain (TAD), which interacts...

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