title: Interactive actions of prostaglandin and epidermal growth factor to enhance proliferation of granulosa cells from chicken prehierarchical follicles.
abstract: The interactive actions of prostaglandin (PG) and epidermal growth factor (EGF) on proliferation of granulosa cells was investigated in prehierarchical small yellow follicles (SYF) of laying hens. The granulosa layers were dispersed into single cells by 12.5 microg/ml collagenase. After 16 h pre-incubation in 0.5% fetal calf serum-supplemented medium, the medium was replaced with serum-free medium. Immunocytochemical staining showed that granulosa cells expressed EGF and its receptor, and their expression was increased by PGE(1) (1-100 ng/ml) or forskolin (10(-7) to 10(-5)M) treatments. EGF receptor was also induced by its ligand EGF. The specific prostaglandin synthase inhibitors SC560 (for COX-1) and NS398 (for COX-2) suppressed EGF-stimulated increase of the granulosa cell number. Furthermore, the effect of EGF was confirmed by the immunocytochemical staining of the proliferating cell nuclear antigen in granulosa cells. Though EGF promoted the expression of both COX-1 and COX-2, the rescue experiment indicated that combined treatment of PGE(1) showed better rescuing effect on NS398 inhibition than SC560 at 10(-6)M, which implies COX-2 plays the predominant role in mediating EGF action. The above results indicate that reciprocal stimulation of intracellular PG and EGF production may enhance proliferation of granulosa cells, hence to facilitate development of chicken prehierarchical follicles.
authors.affiliation: Laboratory of Animal Physiology, College of Animal Sciences, Zhejiang University, No. 268 Kaixuan Road, Hangzhou 310029, PR China.
authors.forename: Yanmei
authors.initials: Y
authors.lastname: Jin
authors.forename: Caiqiao
authors.initials: C
authors.lastname: Zhang
authors.forename: Weidong
authors.initials: W
authors.lastname: Zeng
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Taya
authors.forename: Tu Quang
authors.initials: TQ
authors.lastname: Tan
mesh_terms: D000818:Animals; D049109:Cell Proliferation / Q000187:drug effects*; D002478:Cells, Cultured; D002645:Chickens; D051545:Cyclooxygenase 1 / Q000378:metabolism; D051546:Cyclooxygenase 2 / Q000378:metabolism; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004815:Epidermal Growth Factor / Q000494:pharmacology*; D066246:ErbB Receptors / Q000378:metabolism; D005260:Female; D006107:Granulosa Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D007150:Immunohistochemistry; D009578:Nitrobenzenes / Q000494:pharmacology; D006080:Ovarian Follicle / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis; D011453:Prostaglandins / Q000494:pharmacology*; D011720:Pyrazoles / Q000494:pharmacology; D013449:Sulfonamides / Q000494:pharmacology
chemical_list: D016861:Cyclooxygenase Inhibitors; D009578:Nitrobenzenes; D018809:Proliferating Cell Nuclear Antigen; D011453:Prostaglandins; D011720:Pyrazoles; C115461:SC 560; D013449:Sulfonamides; C080955:N-(2-cyclohexyloxy-4-nitrophenyl)methanesulfonamide; D004815:Epidermal Growth Factor; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D066246:ErbB Receptors