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首页> 外文期刊>Endocrine journal >Mechanism of D2 Agonist-induced Inhibition of GH Secretion from Human GH-secreting Adenoma Cells
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Mechanism of D2 Agonist-induced Inhibition of GH Secretion from Human GH-secreting Adenoma Cells

机译:D2激动剂诱导人分泌GH的腺瘤细胞抑制GH分泌的机制

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References(7) Cited-By(3) The mechanism of dopamine D2 agonist-induced inhibition of GH secretion from GH-secreting adenoma cells was investigated by measurement of intracellular calcium concentration ([Ca2+] i) and static incubation experiment. Bromocriptine decreased [Ca2+]i in a concentration-dependent manner through D2 receptor. The inhibition was abolished by pertussis toxin pretreatment. Bromocriptine did not decrease [Ca 2+]i after nitrendipine had decreased it. 8Br-cAMP increased [Ca2+]i but application of bromocriptine decreased it, suggesting that bromocriptine-induced inhibition of [Ca2+]i is not dependent on bromocriptine-induced inhibition of adenylyl cyclase. Static incubation experiment revealed that bromocriptine inhibited GH secretion in a concentration-dependent manner. The inhibition was through D2 receptor and was abolished by pertussis toxin pretreatment. 8Br-cAMP increased GH secretion. Bromocriptine decreased GH secretion even after 8Br-cAMP pretreatment. However, the GH release from cells incubated with bromocriptine alone was significantly less than that from cells incubated with bromocriptine after 8Br-cAMP pretreatment, suggesting a modulatory action of cAMP system in bromocriptine response.
机译:参考文献(7)引用了(3)通过测量细胞内钙浓度([Ca2 +] i)和静态孵育实验,研究了多巴胺D2激动剂诱导的抑制GH分泌腺瘤细胞分泌GH的机制。溴隐亭通过D2受体以浓度依赖的方式降低[Ca2 +] i。百日咳毒素预处理消除了这种抑制作用。尼莫地平降低溴隐亭后[Ca 2+] i的水平。 8Br-cAMP增加了[Ca2 +] i,但溴隐亭的施用降低了它,这表明溴隐亭诱导的对[Ca2 +] i的抑制并不依赖于溴隐亭诱导的腺苷酸环化酶的抑制。静态温育实验表明,溴隐亭以浓度依赖的方式抑制GH的分泌。抑制作用是通过D2受体实现的,而百日咳毒素预处理则消除了这种抑制作用。 8Br-cAMP增加GH的分泌。溴隐亭即使在8Br-cAMP预处理后也可降低GH分泌。然而,单独用溴隐亭孵育的细胞释放的GH明显低于8Br-cAMP预处理后与溴隐亭孵育的细胞释放的GH,表明cAMP系统在溴隐亭反应中具有调节作用。

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