Studies on ovarian quiescence in the lactating bonnet monkey (Macaca radiata) |
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Authors: | N R Moudgal R Maneckjee B R Srinath K Ramasharma |
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Institution: | (1) Center for Advanced Research in Reproductive Biology, Department of Biochemistry, Indian Institute of Science, 560 012 Bangalore, India |
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Abstract: | Lactating bonnet monkeys were used as a model to understand the mechanism of ovarian quiescence during lactation. The ovary
of the bonnet monkey in the 3rd month of lactation responds well to exogenous pregnant mare serum gonadotropin stimulation
with serum estrogen values reaching maximal levels by day 3 of the gonadotropin injection. The adminstration of ovine prolactin
to such monkeys significantly inhibited the ovarian responsiveness to exogenous gonadotropin. The responsiveness of the pituitary
of the lactating monkey (in the 3rd month of lactation) to luteinizing hormone releasing hormone injection was suppressed
and supplementation with exogenous prolactin further accentuating this effect. The relative ability of chlorpromazine given
intravenously/intramuscularly/intranasally to enhance endogenous prolactin levels was assessed. During the first 5 months
of lactation when the basal prolactin levels were high, the luteinizing hormone levels were low. As the suckling stimulus
reduces and prolactin levels fall, luteinizing hormone levels increase, the first post-parturient mensus occurring by 218
± 4 days. This event was postponed by 3 months on increasing endogenous prolactin levels by administering chlorpromazine (250
μg/day by intranasal mode) over a 5 day period every month starting from the 3rd month of lactation. |
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Keywords: | Lactational amennorrhea hyperprolactinemia ovary luteinizing hormone lactogenic hormone |
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