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- W2037883415 abstract "Hypothalamic proopiomelanocortin (POMC) gene expression was determined using in situ hybridization histochemistry (ISHH) during pregnancy and lactation in rats with and without prior reproduction experience. POMC mRNA levels in the arcuate nucleus were compared between primigravid (first pregnancy) and multigravid (second pregnancy) and primiparous and multiparous lactating rats, and between these groups and age-matched, regularly cycling, nulliparous females in diestrus. Hybridizations were performed using a digoxigenin-labeled riboprobe complementary to 837 bp of the POMC gene. The number of cells expressing POMC mRNA in the arcuate nucleus decreased in primiparous rats on day 12 of lactation when compared with the number of POMC cells in the arcuate nucleus of nulliparous rats in diestrus. In addition, the number of cells expressing POMC mRNA in multigravid animals was significantly less than in the primigravid group on days 7 and 21 of pregnancy, and on day 12 of lactation in primiparous animals. Repeated reproductive experience affected the number of POMC mRNA positive cells; there were fewer cells expressing POMC mRNA in the multigravid females on day 7 of pregnancy and an increase in the number of POMC cells in the multiparous group on day 12 of lactation compared to the primiparous animals. Optical density measurements revealed a significant increase in reaction product in the labeled cells on all days of pregnancy compared with virgin females in diestrus and a significant decrease in reaction product on day 12 of lactation in the multiparous group. The results of the present study indicate that POMC gene expression changes across pregnancy and lactation and that repeated reproductive experience has long-term, possibly permanent, effects on the endogenous opioid system." @default.
- W2037883415 created "2016-06-24" @default.
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- W2037883415 date "1997-06-01" @default.
- W2037883415 modified "2023-10-16" @default.
- W2037883415 title "Differential proopiomelanocortin gene expression in the medial basal hypothalamus of rats during pregnancy and lactation" @default.
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- W2037883415 doi "https://doi.org/10.1016/s0169-328x(96)00267-7" @default.
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