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The application of an in vitro microdialysis system (MDS) for studies on the gonadotrophic control of luteal progesterone secretion in the marmoset monkey is described. Luteal tissue collected from a total of six animals (9 ± 1 days after ovulation) was perfused with Ringer solution (without and with lipoprotein, 0·6 µg/ml). The tissue was exposed to repeated applications of human LH (hLH) and human chorionic gonadotrophin (hCG) (1, 10 and 100 IU/ml) each of 60 min duration. Perfusate was collected in 15-min fractions and assayed for progesterone content. Results showed that addition of lipoproteins to the Ringer solution had a marked effect on progesterone secretion in terms of maintaining stable baseline levels and improving reproducibility of gonadotrophin-induced responses. Progesterone secretion was significantly stimulated by both gonadotrophins at each dose tested. Maximal elevations were obtained with 10 IU/ml and there were no apparent differences in responses to hLH and hCG in terms of either magnitude or duration.

This study indicates that MDS provides a useful in vitro approach for studying the gonadotrophic control of the corpus luteum in non-human primates. The results did not demonstrate disparate actions of hLH and hCG in their ability to stimulate luteal progesterone secretion.

Journal of Endocrinology (1994) 141, 403–409

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