cGHRH_(1-27NH2)可作为家鸡生长激素释放激素受体的配体  被引量:2

cGHRH_(1-27NH2) is a ligand for the growth hormone-releasing hormone receptors(GHRHR_1 and GHRHR_2) in chickens

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作  者:黄桂安[1] 何夏萍[1] 蒋小松 李娟[1] 李小成 杜华锐 王亚军[1] 

机构地区:[1]四川大学生命科学院生物资源与生态环境教育部重点实验室,成都610064 [2]四川省畜牧研究所,成都610066

出  处:《四川大学学报(自然科学版)》2012年第3期677-680,共4页Journal of Sichuan University(Natural Science Edition)

基  金:国家自然科学基金(30771171,30871338);国家863项目(2007AA10Z163)

摘  要:家鸡生长激素释放激素(GHRH)的成熟肽段区存在一个酰胺化位点,提示具27个氨基酸残基的羧基端酰胺化多肽(cGHRH_(1-27NH2))可作为家鸡生长激素释放激素受体(GHRHR)的配体.为验证该假说,利用pGL3-CRE报告基因系统,在培养的中国仓鼠卵巢细胞中,探究人工合成cGHRH_(1-27NH2)多肽对家鸡两个GHRH受体的激活潜能.结果显示:cGHRH_(1-27NH2)可高效激活家鸡两个GHRH受体,并且该多肽对GHRH一型受体(cGHRHR_1:EC_(50):0.18 nmol/L)的激活效能略高于其对GHRH二型受体(cGHRHR_2:EC_(50):0.32 nmol/L)的激活效能.这些研究结果清楚表明GHRH_(1-27NH2)可作为家鸡两个GHRH受体的配体.Previous study revealed that there exists an amidation site within the putative mature chicken growth hormonereleasing hormone (GHRH) peptide region, pointing to a possibility that GHRH peptide of 27 amino acids with an amidated C-terminus (cGHRH1-27NH2) is a ligand for chicken GHRH receptors (GHRHRs).To substantiate this hypothesis, using a pGL3CRE reporter system, the potencies of cGHRH1-27NH2 in activating the two GHRH receptors (namely GHRHR1 and GHRHR2) were examined in cultured Chinese hamster ovary (CHO) cells in this study.Results showed that GHRH1-27NH2 could activate the two GHRH receptors potently and cGHRH1-27NH2 is slightly more potent in activating cGHRHR1 (EC50: 0.18 nmol/L) than in activating cGHRHR2 (EC50: 0.32 nmol/L).The high potencies of cGHRH1-27NH2 in activating cGHRHRs clearly indicate that cGHRH1-27NH2 is a ligand for the two GHRHRs in chickens.

关 键 词:家鸡 垂体 生长激素 cGHRH1-27NH2多肽 生长激素释放激素受体 

分 类 号:Q955[生物学—动物学]

 

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