The importance of the progesterone receptor (PR) in female reproductive and mammary gland biology is well recognized; however, the coregulators selectively enlisted by PR have yet to be comprehensively defined in vivo. To evaluate the involvement of steroid receptor coactivator (SRC)/p160 family members in these physiological systems, a mouse model (PR Cre/+SRC-2 flox/flox) was generated in which SRC-2 function was ablated specifically in cell-types that express the PR. Although PR Cre/+SRC- 2 flox/flox ovarian activity was normal, uterine function was severely compromised. Absence of SRC-2 in PR positive uterine cells led to an early block in embryo implantation, a defect not ascribed to SRC-1 or-3 knockouts. While the PR Cre/+SRC-2 flox/flox uterus can display a partial decidual response, removal of SRC-1 in the PR Cre/+SRC-2 flox/flox uterus results in a block in decidualization, confirming that uterine SRC-2 and-1 are both necessary for PR-mediated transcriptional responses which lead to complete decidualization. The absence of significant branching and alveolar morphogenesis in the hormone-treated PR Cre/+SRC-2 flox/flox mammary gland establishes an important role for mammary SRC-2 in cellular proliferative programs that require PR. Finally, the observation that SRC-2 is also expressed in many of the same cell-types in the human, underscores the importance of further study of this coregulator's role in both peri-implantation biology and mammary development.
- Branching morphogenesis
- Mammary gland
- Steroid receptor coactivator-2
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Immunology and Microbiology(all)