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Identification and characterization of a progestin and adipoQ receptor (PAQR) structurally related to Paqr7 in the ovary of Cynoglossus semilaevis and its potential role in regulating oocyte maturation

文献类型: 外文期刊

作者: Shi, Bao 1 ; Liu, Xuezhou 1 ; Thomas, Peter 3 ; Pang, Yefei 3 ; Xu, Yongjiang 1 ; Li, Xiaoni 1 ; Li, Xiaoxiao 1 ;

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

2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Fisheries Sci & Food Prod Proc, Qingdao 266071, Peoples R China

3.Univ Texas Austin, Inst Marine Sci, Port Aransas, TX 78373 USA

关键词: Cynoglossus semilaevis; Progestin and adipoQ receptor-related to mPR alpha (Paqr7b); Expression; Reproduction; Oocyte maturation

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: 2016 年 237 卷

页码:

收录情况: SCI

摘要: Membrane progestin receptors (mPRs) play an important role in the regulation of oocyte meiotic maturation in fish. However, details of the molecular endocrine mechanism regulating oocyte maturation in multiple spawning fish with asynchronous ovarian development remain unclear. The cDNA encoding a novel progestin and adipoQ receptor with structural similarity to mPR alpha (Paqr7), herein called Paqr7b, was cloned and sequenced from the ovary of half-smooth tongue sole Cynoglossus semilaevis. Phylogenetic analysis showed that Paqr7b represents an evolutionary intermediate between mPR alpha and mPR beta and shares high homology with other similar Paqr proteins in other teleost species. However, the tongue sole Paqr7b protein showed much greater homology to teleost mPR alpha s (average 52%) than mPR beta s (average 40%), suggesting it may have arisen from gene duplication of mPR alpha. paqr7b and paqr7 mRNA exhibited similar patterns of tissue expression. The mRNA and protein of Paqr7b were ubiquitously detected in all tissues analyzed, including the ovary. Moreover, in situ hybridization results revealed that paqr7b was expressed in stage V oocytes, as well as in scattered cells in the pituitary. The expression of paqr7b mRNA in brain and ovary significantly increased from ovarian development stage II to stage V (P < 0.05), and was maximal at stage V, and then sharply decreased at stage VI. The transcript level of paqr7b mRNA in the pituitary also peaked at stage V (P < 0.05). Treatment of tongue sole ovarian follicles with gonadotropin consistently increased the expression level of Paqr7b protein and mRNA in both a dose- and stage-dependent manner. Microinjection of tongue sole oocytes with a morpholino antisense oligonucleotide to Paqr7b blocked the progestin induction of oocyte maturation. Our findings demonstrate an important role of Paqr7b in the regulation of oocyte maturation in tongue sole and suggest the receptor may also influence other aspects of reproduction, such as pituitary function. (C) 2016 Elsevier Inc. All rights reserved.

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