Innate Immunity and Granulosa Cell Function in Ovarian Health
Summary
The ovary is not solely a site of gamete maturation and steroid production but also a dynamic immunological organ in which innate immune mechanisms interact closely with granulosa cell function. Granulosa cells, which surround the developing oocyte, express pattern recognition receptors such as Toll-like receptors that detect pathogen-associated molecular patterns and trigger downstream signalling cascades. These cells both produce and respond to cytokines, chemokines and complement factors, thereby modulating follicle development, ovulation and luteal maintenance. Innate immune mediators influence steroidogenesis by regulating key enzymes responsible for oestrogen and progesterone synthesis, and in turn sex steroids shape local immune cell populations, including macrophages and neutrophils. Balanced crosstalk between granulosa cells and resident immune cells preserves follicular integrity and prevents inappropriate inflammation. Dysregulation of this network can precipitate follicular atresia, ovulatory dysfunction or impaired luteal function, with significant consequences for fertility and ovarian ageing. Understanding these pathways offers new avenues for therapeutic intervention in infertility, ovarian inflammatory disorders and the safe use of vaccines or anti-microbial agents during reproductive life.
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Innate Immunity and Granulosa Cell Function in Ovarian Health publication trend
The graph below shows the total number of articles in innate immunity and granulosa cell function in ovarian health across all publications each year (not limited to Nature Index journals).
Technical terms
Granulosa cells: Somatic cells in ovarian follicles that support oocyte growth and produce sex steroids.
Toll-like receptor 4 (TLR4): A membrane-bound pattern recognition receptor that detects lipopolysaccharide and initiates inflammatory signalling.
Cytokine: A small secreted protein that mediates immune cell communication and modulates cellular responses.
Chemokine: A subclass of cytokines that directs the movement of immune cells towards sites of inflammation or injury.
Steroidogenesis: The enzymatic processes by which cholesterol is converted into steroid hormones within endocrine cells.
NF-κB signalling: A transcription factor pathway activated by innate immune receptors that regulates expression of inflammatory genes.
References
- Toll-Like Receptor 4 Inhibits Estradiol Secretion via NF-κB Signaling in Human Granulosa Cells. Frontiers in Endocrinology (2021).
- Expression of cytokine‐induced neutrophil chemoattractant suppresses tumor necrosis factor alpha expression and thereby prevents the follicles from undergoing atresia and apoptosis. Reproductive Medicine and Biology (2017).
- Revisiting steroidogenesis and its role in immune regulation with the advanced tools and technologies. Genes & Immunity (2021).
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