Coordinated regulation of follicle development by germ and somatic cells
Mario Binelli A B and Bruce D. Murphy B CA College of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, SP 13635-900, Brazil.
B Centre de Recherche en Reproduction Animale, Université de Montréal, CP 5000, St-Hyacinthe, QC J2S 7C6, Canada.
C Corresponding author. Email: bruce.d.murphy@umontreal.ca
Reproduction, Fertility and Development 22(1) 1-12 https://doi.org/10.1071/RD09218
Published: 8 December 2009
Abstract
The continuum of folliculogenesis begins in the fetal ovary with the differentiation of the oogonia and their isolation within the primordial follicles. Primordial follicle activation is an enigmatic process, whereby some follicles enter the growing pool to become primary follicles, thereby embarking on an irreversible progression towards ovulation or atresia. This process is under the coordinated regulation of factors from the oocyte itself, as well as from the somatic cells of the ovary, in particular the theca and granulosa cells, which are structural components of the follicle. These two influences provide the principal stimuli for the growth of the follicle to the late preantral or early antral stage of development. The endocrine effects of the gonadotrophins FSH and LH are essential to the continued progression of the follicle and most atresia can be attributed to the failure to receive or process the gonadotrophin signals. The peri-ovulatory state has received intensive investigation recently, demonstrating a coordinated role for gonadotrophins, steroids, epidermal growth factor family proteins and prostaglandins. Thus, a complex programme of coordinated interaction of governing elements from both germ and somatic cell sources is required for successful follicle development.
Additional keywords: antrum, folliculogenesis, growth factor, oocyte, ovulation.
Acknowledgements
The authors thank Vickie Roussel for preparation the figures and Dr Valerio Portela for valuable discussions on the topics in this review. M.B. was supported by CAPES and FAPESP. Studies from the laboratory of B.D.M. were supported by the Canadian Institutes of Health Research.
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