Ovarian support cell-oocyte interaction (OSC-oocyte interaction)

Ovarian support cell-oocyte interaction refers to the complex, bidirectional communication between the developing oocyte and its surrounding somatic support cells, primarily granulosa and cumulus cells. This interaction is essential for the maturation of the oocyte, regulating both nuclear and cytoplasmic development through gap junction-mediated metabolic exchange and paracrine signaling pathways, such as the Kit ligand/c-Kit and GDF9/BMP15 axes [1, 3]. Somatic cells provide the oocyte with essential nutrients and regulatory molecules like cAMP and cGMP, while the oocyte secretes factors that promote granulosa cell proliferation and function [3, 5]. Disruptions in this communication are linked to clinical conditions like primary ovarian insufficiency (POI), polycystic ovary syndrome (PCOS), and age-related fertility decline [2, 5]. In the therapeutic landscape, this interaction is the focus of novel in vitro maturation (IVM) platforms, such as Gameto's Fertilo, which uses iPSC-derived ovarian support cells (OSCs) to recreate the natural follicular environment in a laboratory setting [1, 4]. These technologies aim to improve fertility outcomes by enhancing oocyte competence for patients who do not respond well to traditional hormonal stimulation or who wish to avoid intensive gonadotropin protocols [2, 3].

Other names

Oocyte-granulosa cell communicationBidirectional follicular signalingOocyte-somatic cell crosstalkGerm cell-somatic cell interactionFollicular microenvironment

Restoration of bidirectional signaling and metabolic support through paracrine factors and gap junctions to enable oocyte cytoplasmic and nuclear maturation.