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• W2023990552 abstract "Proopiomelanocortin (POMC), a precursor protein for ACTH, β-endorphin, and the MSHs, has been identified in the reproductive tracts of both male and female. With rat pituitary POMC complementary DNA (cDNA) as a hybridization probe, POMC-like messenger RNA (mRNA) was identified in the ovaries of rat, mouse, and monkey. The molecular size of POMC-like mRNA in the ovary was 150–200 bases smaller than in the pituitary and hypothalamus but identical to that in the testis and epididymis. The size heterogeneity of POMC mRNA observed in various tissues is not due to differences in the lengths of the poly(A) tail, as measured by RNase H digestion. Si nuclease mapping analysis revealed that POMC mRNAs isolated from pituitary, testis, or ovary share the nucleotide sequences coding for ACTH, β-lipotropin, and the 3′-untranslated region. The regulation of ovarian POMC-like mRNA was also investigated. Treatment of 25-day-old immature female rats with PMSG resulted in profound increases in the ovarian content of total RNA, poly(A) RNA, and POMC-like mRNA. The concentration increased to 3–4 times that in immature or normally cycling animals. POMC-derived peptides are present in the human placenta and are synthesized de novo in cultured placental cells. In this report we also demonstrate POMC-like mRNA in the placenta of rat, mouse, and human. The size of POMC-like mRNA in the placenta was similar to that observed in the testis, epididymis, and ovary and different from that found in the pituitary or hypothalamus. The concentration of placental POMC-like mRNA did not change throughout pregnancy. In conclusion, we have demonstrated that 1) POMC-like mRNA is present in the ovary and placenta of rodents and primates; 2) the size of POMC-like mRNA in the ovary and placenta, like that in the testis and epididymis, is smaller than that in the pituitary and hypothalamus, probably owing to a shortening of the 5′-ends; and 3) the expression of this gene is regulated by gonadotropins in the ovary but probably not in the placenta. (Endocrinology118: 2382–2389, 1986)" @default.
• W2023990552 created "2016-06-24" @default.
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• W2023990552 date "1986-06-01" @default.
• W2023990552 modified "2023-10-15" @default.
• W2023990552 title "Expression and Regulation of Proopiomelanocortin-Like Gene in the Ovary and Placenta: Comparison with the Testis*" @default.
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• W2023990552 doi "https://doi.org/10.1210/endo-118-6-2382" @default.
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