GH response to hypoglycemia and clonidine in the GH-releasing hormone resistance syndrome.

GH response to hypoglycemia and clonidine in the GH-releasing hormone resistance syndrome.
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GH 释放激素抵抗综合征中 GH 对低血糖和可乐定的反应。

DOI:
10.1007/bf03347374
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发表时间:
2006
影响因子:
5.4
通讯作者:
Aguiar-Oliveira,MH
Aguiar-Oliveira,MH
中科院分区:
医学3区
文献类型:
--
作者:
Salvatori,R;Serpa,MG;Parmigiani,G;Britto,AVO;Oliveira,JLM;Oliveira,CRP;Prado,CM;Farias,CT;Almeida,JC;Vicente,TAR;Aguiar-Oliveira,MH

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垂体分泌GH是GHRH刺激作用与SS抑制作用平衡的结果,GHRH受体(GHRH- r)基因突变患者(GHRH- r)为研究不同GH分泌刺激的作用机制提供了独特的模型。在过去,我们已经证明了在一组因inGHRH-R(IVS1+1G→a)纯合突变导致的严重GH缺乏症(GHD)患者中,GH分泌剂(GHRP-2)对GH有小但显著的GH反应。现在,我们试图确定我们是否可以检测生长激素对这些患者的低血糖反应(胰岛素耐量试验)或可乐定(CL)。9例年轻GHD患者同时进行了ITT和CL测试,另外2例仅进行了CL测试。生长激素在ITT期间有少量但显著的增加,而在CL试验期间没有。这些结果表明,尽管GHRH-R功能完全缺失,但ITT对生长激素的反应很小,但很明显。
GH secretion by the pituitary is the result of the balance between the stimulatory effect of GHRH and the inhibitory effect of SS. Patients with mutations in GHRH receptor (GHRH-R) gene (GHRH-R) offer a unique model to study the mechanism of action of different GH secretion stimuli. In the past, we have demonstrated a small but significant GH response to a GH secretagogue (GHRP-2) in a homogenous cohort of patients with severe GH deficiency (GHD) due to a homozygousnullmutation inGHRH-R(IVS1+1G→A). Now, we sought to determine if we could detect a GH response to hypoglycemia (ITT: insulin tolerance test) or clonidine (CL) in these patients. Nine young GHD subjects underwent both ITT and CL tests, and 2 additional subjects underwent only CL test. There was a small but significant GH increase during ITT, but not during CL test. These results indicate that a minimal albeit significant GH response to ITT can occur despite complete lack of GHRH-R function.
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