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• W1493202457 abstract "A thyroliberin (TRH)-responsive particulate bound adenylyl cyclase is present in two rat anterior pituitary tumor cell strains (GH4C1 and GH3) which synthesize and secrete prolactin. At a given Mg2+ concentration, ATP and the guanyl nucleotides GTP and guanyl 5'-yl-imidodiphosphate (GMP-P(NH)P) caused a dose-dependent increase in adenylyl cyclase activity. The maximum response to thyroliberin occurred with ATP and GTP at concentrations above 0.30 mM and 2 microM, respectively. The maximal stimulatory effect of thyroliberin on adenylyl cyclase activity was 2-fold in the presence of GTP. GMP-P(NH)P increased the basal enzyme activity 4- to 10-fold over and above that of equimolar concentrations of GTP but supported poorly the TRH-induced response. Mg2+ caused a dose-dependent increase in the basal enzyme activity and reduced TRH and fluoride-induced responses. Also, Mn2+ and Co2+ stimulated the basal adenylyl cyclase activity while Zn2+, Ca2+, and Cu2+ inhibited the enzyme, and neither cations supported the TRH response. Half-maximal stimulation of the adenylyl cyclase by TRH and half-maximum binding of [3H]TRH to membranes at 35 degrees C were 102 and 56 nM, respectively. Pretreatment with TRH decreased the apparent Vmax of the enzyme and the maximal binding of [3H]TRH. Of 6 TRH analogs tested, only one was able to displace [3H]TRH from its receptor and to increase the adenylyl cyclase activity. We suggest that adenylyl cyclase activation is an early event in the stimulus secretion coupling between TRH and prolactin-producing GH cells." @default.
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• W1493202457 date "1983-09-01" @default.
• W1493202457 modified "2023-10-14" @default.
• W1493202457 title "Thyroliberin receptor binding and adenylyl cyclase activation in cultured prolactin-producing rat pituitary tumor cells (GH cells)." @default.
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• W1493202457 doi "https://doi.org/10.1016/s0021-9258(17)44458-9" @default.
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