Document Detail

Differential expression of CTGF in pre- and post-ovulatory granulosa cells in the hen ovary is regulated by TGFβ1 and gonadotrophins.
MedLine Citation:
PMID:  22732080     Owner:  NLM     Status:  Publisher    
Connective tissue growth factor (CTGF) is a cysteine-rich, matrix-associated heparin-binding protein that is important in many cell types as a regulator of cell proliferation, angiogenesis, cell remodelling and other cellular processes. CTGF is necessary for normal follicle growth and luteinisation in mammals. The avian follicular hierarchy provides an excellent experimental model to study developmental events, particularly the role of cellular remodelling factors in the process of folliculogenesis. In this study, we examined CTGF expression and regulation in the hen ovary. CTGF expression was increased considerably as follicular development proceeds in pre-ovulatory follicles, peaking in expression at the time of ovulation. Immunohistochemistry revealed that CTGF protein was concentrated in the cytoplasm of follicular granulosa cells throughout the ovulation cycle. We isolated granulosa cells from the follicles at two key stages of the ovulation cycle (in terms of cellular alteration): during pre-ovulatory growth and during post-ovulatory regression. Follicle-stimulating hormone (FSH) and luteinising hormone (LH) inhibited CTGF expression in pre-ovulatory granulosa cells but stimulated CTGF expression in post-ovulatory granulosa cells. Moreover, TGFβ1 stimulated CTGF expression in both pre- and post-ovulatory granulosa cells. Nevertheless, TGFβ1 could rescue the inhibition of gonadotrophins on pre-ovulatory granulosa CTGF expression but could not further stimulate CTGF expression in gonadotrophin-treated post-ovulatory granulosa cells. The results of this study indicate that CTGF expression in avian granulosa cells is modulated by a combination of gonadotrophins and TGFβ1 according to the different stages of follicle maturation and degradation. The results also suggest that the gonadotrophic action on post-ovulatory follicles in the avian ovary differs from the gonadotrophin-induced luteinisation in mammals.
Guiyu Zhu; Li Kang; Chunhong Yang; Xu Zhang; Meng Wang; Yunliang Jiang
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-22
Journal Detail:
Title:  General and comparative endocrinology     Volume:  -     ISSN:  1095-6840     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370735     Medline TA:  Gen Comp Endocrinol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Inc.
Laboratory of Animal Molecular Genetics, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Taian 271018, China; Department of Biology Science and Technology, Taishan University, Taian 271021, China.
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