Changes of Hypothalamic GnRH-I, POMC and NPY mRNA Expression and Serum IGF-I and Leptin Concentrations during Maturation of Shaoxing Ducks (Anas platyrhynchos)
文献类型： 外文期刊
作者： Ni, Y. 1 ; Lu, L. 2 ; Chen, J. 1 ; Zhao, R. 1 ;
作者机构： 1.Nanjing Agr Univ, Key Lab Anim Physiol & Biochem, Nanjing 210095, Peoples R China
2.Zhejiang Acad Agr Sci, Inst Anim Sci, Hangzhou 310021, Zhejiang, Peoples R China
关键词： leptin: 169494-85-3;IGF-I: 67763-96-6;gonadotrophin-releasing hormone: GnRH;secretion;mRNA: expression;transcription;sexual maturation;reproductive function;peripheral signal;central signal;peripheral metabolic status
期刊名称：ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES （ 影响因子：2.509； 五年影响因子：2.604 ）
ISSN：
年卷期：
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收录情况： SCI
摘要： Sexual maturity in poultry is controlled by a complex neural circuit located in the basal forebrain, which integrates the central and peripheral signals to activate hypothalamic gonadotrophin-releasing hormone (GnRH) secretion. This study demonstrated the changes of GnRH-I, POMC and NPY mRNA transcription in hypothalamus and IGF-I and leptin levels in serum of Shaoxing ducks during puberty. Body weight increased progressively from d30 to d120 and at d120 the flock reached 5% of laying rate. A significant up-regulation of hypothalamic GnRH-I mRNA expression was observed from d60, reaching the peak at d120. POMC and NPY mRNA expression in hypothalamus showed a similar pattern, which increased from d30 to d60, followed by a significant decrease towards sexual maturity. Serum IGF-I levels exhibited two peaks at d30 and d120, respectively. Serum leptin displayed a single peak at d90. The results indicate that the down-regulation of POMC and NPY genes in hypothalamus coincides with the up-regulation of GnRH-I gene to initiate sexual maturation in ducks. In addition, peripheral IGF-I and leptin may relay the peripheral metabolic status to the central system and contribute to the initiation of the reproductive function in ducks.
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