Spatial and temporal patterns of expression of cellular retinol-binding protein and cellular retinoic acid-binding proteins in rat uterus during early pregnancy

Biology of Reproduction
W L Zheng, D E Ong

Abstract

Retinoic acid, perhaps the most potent hormonal form of the naturally occurring retinoids (retinol and derivatives), is required in vivo for the maintenance of normal pregnancy and embryo development. However, little is known about the specific sites of action and metabolism in the uterus during pregnancy. In this study we describe the pattern of temporal and cell-specific expression of cellular retinol-binding protein (CRBP) and cellular retinoic acid-binding proteins type I and type II (CRABP and CRABP[II], respectively) in the rat uterus during the periimplantation period (Day 1 to Day 7 of pregnancy; Day 1 = presence of vaginal plug). Immunohistochemical studies showed that there were dramatic and rapid changes in expression pattern of the retinoid-binding proteins after mating as early as Day 1, as well as a differential expression of these proteins when the mesometrial side and antimesometrial side of the uterus were examined during the periimplantation period. CRABP(II), whose presence has been previously shown to correlate with retinoic acid synthesis in the uterine epithelium, was specifically localized to the luminal epithelium at Day 1, being stronger on the mesometrial side, and then fell to lower levels. CRBP was a...Continue Reading

Citations

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