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Oxytocin was identified in ovaries recovered on Day 5 (+/- 1) of the luteal phase from three female marmoset monkeys (Callithrix jacchus). With use of a reverse transcription-polymerase chain reaction assay, expression of mRNA for oxytocin and oxytocin receptor was detected in both luteal tissue and in the ovarian remnant. Evidence for ovarian synthesis of oxytocin was provided by immunohistochemistry, which showed positive staining for oxytocin and neurophysin in the cytoplasm of the luteal cells. Some luteal cells had a more intensely stained perinuclear region than others for oxytocin immunoreactivity, whereas the staining for neurophysin was evenly distributed. Granulosa and theca cells of antral follicles also showed positive staining for oxytocin immunoreactivity; no reactivity was found in fibroblast or endothelial cells. Oxytocin immunoreactivity was also detected in the luteal tissue of all animals by immunoassay, with values ranging from 2.8 to 12.1 ng/g wet weight. The oxytocin concentration for the ovarian remnant was either very low (0.55-0.75 ng/g wet weight) or nondetectable (&lt; 0.5 ng/g wet weight). Local production of oxytocin within the ovary was suggested by the measurement of higher oxytocin concentrations in the blood from ovaries containing corpora lutea compared with peripheral blood. Collectively, these results provide evidence for ovarian biosynthesis of oxytocin and suggest the possibility of a paracrine role in the regulation of primate ovarian function.

Oxytocin Gene Expression and Oxytocin Immunoactivity in the Ovary of the Common Marmoset Monkey (Callithrix Jacchus)