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- W2013361212 abstract "Gonadotropin releasing hormone (GnRH)-stimulated release of the alpha subunit common to the gonadotropins and to thyrotropin was studied in rat pituitary cell cultures. In these studies we took advantage of a recently prepared antiserum specific for the alpha subunit. We show that pituitary cells treated with GnRH released alpha subunit in a similar pattern to intact luteinizing hormone (LH) during short-term incubations (0-12 h); during prolonged incubations (12-48 h), however, release of alpha subunit did not desensitize in response to the releasing hormone and the pattern became different from that measured for intact LH. Further, we assessed the relative requirement for Ca2+ in the release of LH and alpha subunit. When pituitary cells were treated with 10(-8) M GnRH in the presence of a range of concentrations of the Ca2+ ion channel antagonist, methoxyverapamil (D-600), release of both LH and alpha subunit was inhibited in a similar and dose-dependent manner; 10(-4) M D-600 showed maximum inhibitory efficacy (IC50 = 10(-5) M). The calmodulin antagonist, pimozide, also inhibited both GnRH-stimulated LH and alpha subunit release (IC50 = 0.75 microM). These data suggested that although the Ca2+/calmodulin system appears to mediate both the release of LH and alpha subunit in response to GnRH, these processes appear differentially regulated during long-term exposure to the releasing hormone." @default.
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- W2013361212 date "1988-03-01" @default.
- W2013361212 modified "2023-09-26" @default.
- W2013361212 title "Release of gonadotropin alpha subunit from rat pituitary cultures in response to GnRH" @default.
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- W2013361212 doi "https://doi.org/10.1016/0303-7207(88)90011-1" @default.
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