Immunocytochemical localization of nitric oxide synthase-III in reproductive organs of female rats during the oestrous cycle

The Histochemical Journal
S ChatterjeeC Yallampalli

Abstract

Constitutive endothelial nitric oxide synthase (NOS III) expression during the oestrous cycle was mapped immunocytochemically on 5 microns-thick paraffin sections of rat female reproductive organs. Ovarian NOS III immunoreactivity increased with follicular maturation (strongest in dioestrus corpora lutea), suggesting that nitric oxide may regulate folliculogenesis and luteal functions. Oviductal NOS III, localized in mucosal epithelium and muscular wall, was maximal during pro-oestrus and oestrus, suggesting that nitric oxide may impart periovulatory quiescence for reception, retention and fertilization of ovulated oocytes. Uterine NOS III, localized in endometrial and glandular epithelium, and in myometrial smooth muscle cells, was abundantly expressed during pro-oestrus and oestrus. The peri-implantation period in pregnant rats corresponds to the periovulatory period and the elevated NOS, and thus nitric oxide may provide uterine relaxation to facilitate embryo implantation following fertilization. Cervical NOS III, localized in the mucus-secreting epithelium and smooth muscle cells, exhibited enzyme abundance during pro-oestrus and oestrus, probably indicating cervical preparation to facilitate sperm entry following mating. ...Continue Reading

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