Zinc Dynamics in Male Reproductive Health

Zinc is a pivotal trace element that orchestrates multiple facets of male reproductive physiology, from germ cell development in the testes to the fertilisation competence of mature spermatozoa. In the testicular milieu, zinc modulates spermatogonial proliferation and Sertoli cell support, while in the epididymis it contributes to the maturation processes that confer motility and the capacity for capacitation. The prostate gland secretes zinc-rich seminal plasma, where zinc functions as both a stabiliser of sperm chromatin and a modulator of antioxidant defences. At the molecular level, zinc ions influence signalling cascades through interactions with specific membrane receptors, regulate intracellular pH and calcium homeostasis, and participate in protein tyrosine phosphorylation events essential for acrosomal exocytosis. Dysregulation of zinc uptake or distribution has been linked to suboptimal sperm parameters, including reduced motility, abnormal morphology and impaired DNA integrity. Nutritional status, environmental factors and genetic variants of zinc transporters collectively determine zinc availability in reproductive tissues, underlining the element’s global significance for male fertility and its potential exploitation in clinical and agricultural settings.

Research from Nature Portfolio

Recent studies have systematically shown that zinc concentrations in seminal plasma are consistently lower in infertile men compared with fertile controls, and that zinc supplementation can lead to measurable improvements in semen volume, motility and normal sperm morphology. Another line of investigation has revealed that sperm undergoing capacitation exhibit dynamic redistributions of zinc ions, characterised by distinct “zinc signatures” that change in response to capacitation stimuli, proteasomal activity and extracellular zinc availability. These findings offer novel biomarkers for sperm functional status and suggest that modulation of zinc fluxes could enhance assisted reproduction techniques.

Zinc Dynamics in Male Reproductive Health publication trend

The graph below shows the total number of articles in zinc dynamics in male reproductive health across all publications each year (not limited to Nature Index journals).

Technical terms

Capacitation: A series of physiological and biochemical changes that sperm undergo in the female tract (or in vitro) to gain fertilisation competence, including altered ion fluxes and protein phosphorylation.

Acrosome: A specialised vesicle at the anterior part of the sperm head containing enzymes necessary for penetration of the oocyte’s zona pellucida.

Seminal plasma: The fluid fraction of semen that supplies nutrients, antioxidant protection and trace elements such as zinc to spermatozoa.

GPR39: A G-protein-coupled receptor that senses extracellular zinc and initiates intracellular signalling pathways critical for sperm motility and acrosomal reaction.

Zinc signature: Distinct patterns of intracellular zinc distribution observed in spermatozoa during capacitation, which correlate with functional status and fertilisation potential.

References

1. Zinc levels in seminal plasma and their correlation with male infertility: A systematic review and meta-analysis. Scientific Reports (2016).
2. Zinc ion flux during mammalian sperm capacitation. Nature Communications (2018).
3. Zinc: A Necessary Ion for Mammalian Sperm Fertilization Competency. International Journal of Molecular Sciences (2018).
4. The Role of Zinc in Male Fertility. International Journal of Molecular Sciences (2020).
5. Role of Zinc (Zn) in Human Reproduction: A Journey from Initial Spermatogenesis to Childbirth. International Journal of Molecular Sciences (2021).
6. The influence of macro- and microelements in seminal plasma on diluted boar sperm quality. Acta Veterinaria Scandinavica (2017).