Abstract
Steroidogenesis is a major function of the developing follicle. However, little is known about the stage of onset of steroid regulatory proteins during follicular development in sheep. In this study, several steroidogenic enzymes were studied by immunohistochemistry and/or in situ hybridization; cytochrome P450 side chain cleavage (P450(scc)), cytochrome P450 17alpha-hydroxylase (17alphaOH), 3beta-hydroxysteroid dehydrogenase (3beta-HSD), cytochrome P450 aromatase (P450(arom)), steroidogenic factor 1 (SF-1), steroidogenic acute regulatory protein (StAR), and LH receptor (LH-R). To define the stages of follicular growth, ovarian maps were drawn from serial sections of ovine ovaries, and follicles were located and classified at specific stages of growth based on morphological criteria. In this way, the precise onset of gene expression with respect to stages of follicular growth for all these proteins could be observed. The key findings were that ovine oocytes express StAR mRNA at all stages of follicular development and that granulosa cells in follicle types 1-3 express 3beta-HSD and SF-1. Furthermore, the onset of expression in theca cells of StAR, P450(scc), 17alphaOH, 3beta-HSD, and LH-R occurred in large type 4 follicles just...Continue Reading
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