Vitamin D receptor status alters mammary gland morphology and tumorigenesis in MMTV-neu mice

Carcinogenesis
Glendon M Zinser, Joellen Welsh

Abstract

The vitamin D(3) receptor (VDR) is a ligand-dependent transcription factor implicated in regulation of cell cycle, differentiation and apoptosis of both normal and transformed cells derived from mammary gland. In these studies we examined whether VDR status altered mammary gland morphology or transformation in the well-characterized MMTV-neu transgenic model of breast cancer. We demonstrate that VDR protein is highly expressed in neu-positive epithelial cells of preneoplastic lesions, established tumors and lung metastases from MMTV-neu mice. Furthermore, MMTV-neu mice lacking VDR exhibit abnormal mammary ductal morphology characterized by dilated, distended ducts containing dysplastic epithelial cells. From 12 months of age on, MMTV-neu mice lacking VDR also experience body weight loss, atrophy of the mammary fat pad, estrogen deficiency and reduced survival. The limited survival of MMTV-neu mice lacking VDR precluded an accurate assessment of the impact of complete VDR ablation on tumor development. MMTV-neu mice heterozygous for VDR, however, did not exhibit body weight loss, mammary gland atrophy or compromised survival. Compared with MMTV-neu mice with two copies of the VDR gene, haploinsufficiency of VDR shortened the lat...Continue Reading

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