Immunological Factors in Male Infertility

Male infertility encompasses a spectrum of disorders in which immune mechanisms play a critical role. Central to this is the production of antisperm antibodies (ASAs) that bind to sperm surface antigens and impede motility, capacitation and acrosomal reaction. Disruption of the blood–testis barrier through trauma, infection or surgical intervention permits exposure of germ-cell antigens to the systemic immune system, triggering autoimmunity. Innate immune elements, including toll-like receptors and cytokine networks, further modulate local inflammatory responses within the testis and epididymis. Oxidative stress arising from leukocyte infiltration and immature spermatozoa contributes to lipid peroxidation and DNA fragmentation, exacerbating immunological damage. Advances in precise immunoassays and biomarker discovery have begun to translate into standardised diagnostic protocols and targeted treatments, emphasising the global significance of immunological evaluation in routine fertility assessment and assisted-reproduction strategies.

Research from Nature Portfolio

Recent studies have refined the detection of sperm-specific autoantibodies by developing a highly sensitive enzyme-linked immunosorbent assay (ELISA) targeting the sperm-specific protein ACTL7a. This assay demonstrated near-perfect discrimination between fertile and infertile sera, with a positive predictive value reaching 100 per cent under stringent cut-off criteria. By enabling quantification of anti-ACTL7a antibody titres with minimal false-positives, this methodology offers a robust tool for clinical laboratories to standardise immunological infertility diagnosis and to stratify patients for personalised interventions.

Immunological Factors in Male Infertility publication trend

The graph below shows the total number of articles in immunological factors in male infertility across all publications each year (not limited to Nature Index journals).

Technical terms

Antisperm antibodies (ASAs): Autoantibodies directed against sperm surface antigens that can impair motility, capacitation and fertilisation.

Blood–testis barrier: A specialised physical and immunological barrier between the seminiferous epithelium and interstitial tissue that prevents immune recognition of germ-cell antigens.

Enzyme-linked immunosorbent assay (ELISA): A quantitative immunoassay technique that uses enzyme-linked antibodies to detect and measure specific antigens or antibodies in biological samples.

Mixed antiglobulin reaction (MAR): A diagnostic test in which sperm are mixed with patient serum and anti-globulin reagents to detect the presence of ASAs bound to spermatozoa.

Oxidative stress: A state in which excessive reactive oxygen species overwhelm antioxidant defences, leading to lipid peroxidation, DNA damage and impaired sperm function.

References

1. Immune Infertility Should Be Positively Diagnosed Using an Accurate Method by Monitoring the Level of Anti-ACTL7a Antibody. Scientific Reports (2016).
2. Antisperm Antibody Testing: A Comprehensive Review of Its Role in the Management of Immunological Male Infertility and Results of a Global Survey of Clinical Practices. The World Journal of Men's Health (2022).
3. Pathogenesis of Autoimmune Male Infertility: Juxtacrine, Paracrine, and Endocrine Dysregulation. Pathophysiology (2021).
4. A novel protein biochip screening serum anti-sperm antibody expression and natural pregnancy rate in a follow-up study in Chinese infertility. Bioscience Reports (2020).