Epididymal Function and Male Fertility Mechanisms
Summary
The epididymis is a convoluted duct connecting the testis to the vas deferens, structured into caput, corpus and cauda regions that together orchestrate sperm maturation, storage and transport. As sperm transit the epididymal lumen, they undergo a series of biochemical and biophysical modifications including alterations in protein composition, lipid remodelling and small RNA acquisition. These changes are mediated by interactions with specialised epithelial cells—principally principal, clear and basal cells—and by secreted extracellular vesicles known as epididymosomes. Hormonal control through androgens and testis‐derived lumicrine factors ensures region-specific gene expression, while a finely tuned immune milieu preserves tissue integrity and supports sperm quality. Recent insights have highlighted the role of transcriptional regulators, microRNAs and antimicrobial peptides in epithelial differentiation and sperm functional competence. Disruption of these processes, whether by genetic mutation, ageing or environmental stress, can impair capacitation, acrosome reaction and fertilisation potential. Understanding the interplay of endocrine, paracrine and lumicrine signalling in the epididymis holds promise for novel fertility diagnostics, contraceptive strategies and interventions to delay reproductive ageing.
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Epididymal Function and Male Fertility Mechanisms publication trend
The graph below shows the total number of articles in epididymal function and male fertility mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
Epididymis: A segmented duct (caput, corpus, cauda) where spermatozoa acquire motility and fertilisation competence.
Epididymosomes: Extracellular vesicles secreted by epididymal epithelial cells that transfer proteins, lipids and RNAs to maturing sperm.
Lumicrine signalling: Non-steroidal testis-derived factors that travel through the reproductive tract to influence epididymal gene expression.
Sperm capacitation: A series of physiological and biochemical changes enabling sperm to undergo the acrosome reaction and fertilise an egg.
RNA-seq transcriptomics: A high-throughput sequencing approach to quantify tissue- or cell-specific gene expression profiles.
References
- Single-cell and spatial transcriptomic investigation reveals the spatiotemporal specificity of the beta-defensin gene family during mouse sperm maturation. Cell Communication and Signaling (2024).
- RUNX transcription factors are essential in maintaining epididymal epithelial differentiation. Cellular and Molecular Life Sciences (2024).
- Distinct actions of testicular endocrine and lumicrine signaling on the proximal epididymal transcriptome. Reproductive Biology and Endocrinology (2024).
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