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Growth differences and differential expression analysis of pituitary adenylate cyclase activating polypeptide (PACAP) and growth hormone-releasing hormone (GHRH) between the sexes in half-smooth tongue sole Cynoglossus semilaevis

文献类型： 外文期刊

作者： Ji, Xiang-Shan 1 ; Chen, Song-Lin 1 ; Jiang, Yun-Liang 2 ; Xu, Tian-Jun 1 ; Yang, Jing-Feng 1 ; Tian, Yong-Sheng 1 ;

作者机构： 1.Chinese Acad Fisheries Sci, Yellow Sea Fisheries Res Inst, Key Lab Sustainable Utilizat Marine Fisheries Res, Qingdao 266071, Peoples R China

2.Shandong Agr Univ, Coll Anim Sci & Technol, Tai An 271018, Shandong, Peoples R China

关键词： Half-smooth tongue sole;Cynoglossus semilaevis;Sexual dimorphism;Growth;PACAP;PRP;GHRH

期刊名称：GENERAL AND COMPARATIVE ENDOCRINOLOGY （ 影响因子：2.822； 五年影响因子：2.772 ）

ISSN： 0016-6480

年卷期： 2011 年 170 卷 1 期

页码：

收录情况： SCI

摘要： Pituitary adenylate cyclase activating polypeptide (PACAP) and growth hormone-releasing hormone (GHRH) are regulators of growth hormone secretion. In this article, we examined the difference in growth and mRNA expression of PACAP and GHRH between the sexes in half-smooth tongue sole, an important cultured fish species indicating sexually growth dimorphism in China. Firstly, a significant body weight difference between females and males was first observed at 7 months (P < 0.05) and at 18 months the mean body weight of the females (771.0 +/- 44.3 g) was as much as 4.9 times higher than that of males (130.6 +/- 6.0 g). As a result, half-smooth tongue sole, Cynoglossus semilaevis, is a good model to investigate the effects of growth-related genes expression on sexual growth dimorphism. Secondly, the cDNAs encoding PRP/PACAP and GHRH were isolated. Two differently processed mRNA transcripts of PRP/PACAP (PRP-encoding and PRP splice variant) were found. PACAP and GHRH mRNA was highly abundant in brain and less abundant in other tissues. However, PACAP mRNA was expressed in most brain regions, and was lower in the cerebellum. GHRH mRNA was predominantly expressed in the hypothalamus and weakly expressed in all areas of the brain examined. Ontogenetic expression analysis indicated that PACAP and GHRH mRNA was detected in the early stages of embryogenesis. Finally, differential expression showed that there was no significant difference of the expression level of PACAP or GHRH between the sexes before 8 months of age. However, between 9 and 12 months of age, the GHRH mRNA expression level in males was significantly higher than in females (P < 0.05), which might be associated with GH deficiency in males. In contrast, the male PACAP mRNA expression level was not significantly higher than that in females even at 9 and 12 months of age. The present results provide important clues for understanding the sexual growth dimorphism mechanisms in half-smooth tongue sole. (C) 2010 Elsevier Inc. All rights reserved.

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