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(American Journal of Pathology. 1998;153:349-354.)
© 1998 American Society for Investigative Pathology

Short Communications

Differential Expression of the Peroxisome Proliferator-Activated Receptor {gamma} (PPAR{gamma}) and Its Coactivators Steroid Receptor Coactivator-1 and PPAR-Binding Protein PBP in the Brown Fat, Urinary Bladder, Colon, and Breast of the Mouse

Sanjay Jain, Sujata Pulikuri, Yijun Zhu, Chao Qi, Yashpal S. Kanwar, Anjana V. Yeldandi, M. Sambasiva Rao and Janardan K. Reddy

From the Department of Pathology, Northwestern University Medical School, Chicago, Illinois

Peroxisome proliferator-activated receptors (PPARs) regulate genes involved in lipid metabolism and adipocyte differentiation. Steroid receptor coactivator-1 (SRC-1) and PPAR-binding protein (PBP) interact with PPAR{gamma} and act as coactivators to enhance ligand-dependent transcription. We report here that PPAR{gamma}, SRC-1, and PBP are differentially expressed in the brown fat, transitional epithelium of the urinary bladder, colonic mucosa, and mammary epithelium of the adult mouse. PPAR{gamma} and PBP are expressed in the transitional epithelium of urinary bladder and in brown adipose tissue, but not SRC-1. In the colonic mucosa, PPAR{gamma} expression occurs throughout the villi, whereas the expression of both SRC-1 and PBP is confined mostly to the crypts. The expression of both SRC-1 and PBP is prominent in the breast epithelium of nonpregnant, pregnant, and lactating mice, whereas PPAR{gamma} expression appeared prominent during lactation. During early embryonic development, PPAR{gamma}, SRC-1, and PBP are differentially expressed, with only limited cell types displaying overlapping expression. PPAR{gamma} and PBP expression overlapped in the brown fat and urogenital sinus at stage E15.5 of embryogenesis, whereas SRC-1 expression occurred mostly in neuroepithelium and cartilage between stages E9.5 and E13.5 of embryogenesis.




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