Testicular Immunology and Male Fertility
Summary
The testis represents a unique immunological niche that must reconcile two seemingly opposing demands: the protection of developing germ cells from autoimmune attack and the capacity to respond to infection or injury. Central to this balance are Sertoli cells, which form the blood-testis barrier, secrete immunoregulatory factors and provide physical and trophic support to germ cells as they progress through spermatogenesis. Leydig cells in the interstitial compartment produce testosterone, a hormone essential for both sperm production and the local modulation of immune cell function. Macrophages, dendritic cells and specialised T-cell subsets inhabit the testicular microenvironment, where they adopt predominantly tolerogenic phenotypes but can mount innate responses when challenged by pathogens. Cytokines and chemokines orchestrate communication between somatic and immune cells, ensuring that inflammatory signals remain localised and transient. Disruption of this tightly regulated system—by infection, systemic inflammation, obesity or autoimmunity—can lead to oxidative stress, germ-cell apoptosis, impaired steroidogenesis and ultimately subfertility or infertility. Advances in understanding these mechanisms offer new opportunities for therapeutic intervention, ranging from targeted anti-inflammatory strategies to cell-based approaches that harness the immunomodulatory properties of Sertoli cells for fertility preservation and transplantation medicine.
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Testicular Immunology and Male Fertility publication trend
The graph below shows the total number of articles in testicular immunology and male fertility across all publications each year (not limited to Nature Index journals).
Technical terms
Immune privilege: A state in which an organ limits inflammatory responses to protect delicate tissues from immune-mediated damage.
Sertoli cells: Somatic cells lining seminiferous tubules that form the blood-testis barrier and support germ-cell development through secretion of growth and immunoregulatory factors.
Leydig cells: Interstitial cells that synthesise testosterone, influencing both systemic endocrine functions and local immune regulation.
Cytokines: Small secreted proteins that mediate intercellular communication during immune and inflammatory processes.
Blood-testis barrier: A specialised junctional complex between Sertoli cells that segregates developing germ cells from systemic circulation and immune surveillance.
References
- Is methotrexate safe for men with an immune-mediated inflammatory disease and an active desire to become a father? Results of a prospective cohort study (iFAME-MTX). Annals of the Rheumatic Diseases (2023).
- Grafted Sertoli Cells Exert Immunomodulatory Non-Immunosuppressive Effects in Preclinical Models of Infection and Cancer. Cells (2024).
- Structural, cellular and molecular aspects of immune privilege in the testis. Frontiers in Immunology (2012).
- Immune Cell Subtypes and Their Function in the Testis. Frontiers in Immunology (2020).
- Mechanism of Inflammatory Associated Impairment of Sperm Function, Spermatogenesis and Steroidogenesis. Frontiers in Endocrinology (2022).
- Sertoli Cell Immune Regulation: A Double-Edged Sword. Frontiers in Immunology (2022).
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