{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T12:52:17Z","timestamp":1773147137783,"version":"3.50.1"},"reference-count":29,"publisher":"The Company of Biologists","issue":"13","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2002,7,1]]},"abstract":"<jats:p>Postnatal mammary gland morphogenesis is achieved through coordination of signaling networks in both the epithelial and stromal cells of the developing gland. While the major proliferative hormones driving pubertal mammary gland development are estrogen and progesterone, studies in transgenic and knockout mice have successfully identified other steroid and peptide hormones that impact on mammary gland development. The vitamin D3 receptor (VDR), whose ligand 1,25-dihydroxyvitamin D3 is the biologically active form of vitamin D3, has been implicated in control of differentiation, cell cycle and apoptosis of mammary cells in culture, but little is known about the physiological relevance of the vitamin D3 endocrine system in the developing gland. In these studies, we report the expression of the VDR in epithelial cells of the terminal end bud and subtending ducts, in stromal cells and in a subset of lymphocytes within the lymph node. In the terminal end bud, a distinct gradient of VDR expression is observed, with weak VDR staining in proliferative populations and strong VDR staining in differentiated populations. The role of the VDR in ductal morphogenesis was examined in Vdr knockout mice fed high dietary Ca2+ which normalizes fertility, serum estrogen and neonatal growth. Our results indicate that mammary glands from virgin Vdr knockout mice are heavier and exhibit enhanced growth, as evidenced by higher numbers of terminal end buds, greater ductal outgrowth and enhanced secondary branch points, compared with glands from age- and weight-matched wild-type mice. In addition, glands from Vdr knockout mice exhibit enhanced growth in response to exogenous estrogen and progesterone, both in vivo and in organ culture, compared with glands from wild-type mice. Our data provide the first in vivo evidence that 1,25-dihydroxyvitamin D3 and the VDR impact on ductal elongation and branching morphogenesis during pubertal development of the mammary gland. Collectively, these results suggest that the vitamin D3 signaling pathway participates in negative growth regulation of the mammary gland.<\/jats:p>","DOI":"10.1242\/dev.129.13.3067","type":"journal-article","created":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T04:56:48Z","timestamp":1619413008000},"page":"3067-3076","source":"Crossref","is-referenced-by-count":124,"title":["Vitamin D3 receptor ablation alters mammary gland morphogenesis"],"prefix":"10.1242","volume":"129","author":[{"given":"Glendon","family":"Zinser","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kathryn","family":"Packman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"JoEllen","family":"Welsh","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"237","reference":[{"key":"2021042604200918900_ANZANO-ETAL-1994","unstructured":"Anzano, M. 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