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Expression of CCT6A mRNA in chicken granulosa cells is regulated by progesterone

文献类型： 外文期刊

作者： Wei, Qingqing 1 ; Zhu, Guiyu 1 ; Cui, Xinxing 1 ; Kang, Li 1 ; Cao, Dingguo 3 ; Jiang, Yunliang 1 ;

作者机构： 1.Shandong Agr Univ, Coll Anim Sci & Vet Med, Lab Anim Mol Genet, Tai An 271018, Shandong, Peoples R China

2.Taishan Univ, Dept Biol Sci & Technol, Tai An 271021, Shandong, Peoples R China

3.Shandong Acad Agr Sci, Inst Poultry Sci, Jinan 250023, Peoples R China

关键词： CCT6A;Chicken;Granulosa cells;Hormones;Progesterone receptor;Promoter

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

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收录情况： SCI

摘要： CCT6A, the zeta subunit of the chaperonin containing TCP1 complex, is the only cytosolic chaperonin in eukaryotes and is estimated to assist in the folding of multiple proteins including actin, tubulin, cyclin E, myosin, transducin and the Von Hippel Lindau tumor suppressor. In this study, we examined the expression of CCT6A and progesterone receptor (. PGR) mRNA in various tissues of chickens and the regulation of CCT6A and PGR mRNA in ovarian granulosa cells. Northern blot analysis revealed that CCT6A had one transcript and was highly expressed in the ovary tissues from chickens at both the sexually immature and mature stages. CCT6A mRNA expression was increased maximally from pre-hierarchy follicles to F5 follicles and subsequently declined in pre-ovulatory and post-ovulatory follicles. The expression of PGR mRNA exhibited the similar pattern to CCT6A. In granulosa cells isolated from pre-ovulatory follicles, follicle-stimulating hormone (FSH) inhibited the expression of CCT6A mRNA, whereas progesterone activated CCT6A and suppressed PGR expression in a time-dependent manner. We further investigated the regulation of CCT6A transcription by progesterone by constructing various progressive deletions and mutants and identified the core promoter element of CCT6A and the binding region of progesterone, which is located from -2056 to -2051. Taken together, our results indicate that CCT6A likely plays an important role in follicle growth, and in granulosa cells, progesterone activates CCT6A transcription via a progesterone response element (PRE) located in the distal promoter of CCT6A.

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