Let’s Talk and Grow Together: A Bidirectional Communication between Granulosa- and Oocyte-Derived Factors in the Ovary

Reproduction, one of the most active and appealing area of research for endocrinologists and reproductive biologists since many a years, has several faces that remains to be unmasked in terms of its regulatory aspects. Available information on the regulation of oocyte development and maturational competence are gaping and needs elucidation to achieve utmost quality of eggs, a major area of concern. The notion of the somatic follicular cells providing an appropriate microenvironment for the development of oocyte throughout its journey has been replaced with the current perception of a complex yet regulated cross-talk between the granulosa-and oocyte-derived factors to orchestrate follicle development. Interestingly, actions of FSH and LH are mediated or modulated by these locally produced non-steroidal peptide factors from the follicular layer and the oocyte itself (insulin-like growth factors (IGFs), epidermal growth factor (EGF) family members, TGFβ super family members etc.), forming an intimate regulatory network within the ovarian follicles. Present article will provide a deeper insight into the need and underlying mechanisms of action of these growth factors in the intraovarian network to sustain a healthy oocyte.