PMID: 9435255Jan 22, 1998Paper

Transgenic mice carrying an imbalance in the native ratio of A to B forms of progesterone receptor exhibit developmental abnormalities in mammary glands

Proceedings of the National Academy of Sciences of the United States of America
G ShyamalaE Dale

Abstract

In this report we document the creation of transgenic mice in which the native ratio of A and B forms of progesterone receptor (PR) has been altered by the introduction of additional A form as transgene. We also show that in these mice there is an aberration in mammary development. In ovariectomized prepubertal PR-A transgenic mice, end buds with unusual morphology persist after ovariectomy, and in young adult nonovariectomized mice, mammary glands have extensive lateral branching. The glands of adult mice also exhibit ductal hyperplasia with a disorganized basement membrane and decreased cell-cell adhesion, features commonly associated with neoplasia. Because progesterone is a mitogenic hormone in mammary glands and PR is required for mammary development, these data provide direct evidence that in vivo a regulated expression of the two isoforms of PR is critical for appropriate cellular response to progesterone and that for mammary glands this may have major implications to carcinogenesis.

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