Transport Mechanisms of Steroids and Drugs in the Male Reproductive System
Summary
Steroid hormones and pharmacological agents traverse specialised barriers within the male reproductive tract to exert physiological effects or elicit toxicity. The blood–testis barrier (BTB) is established by tight junctions between Sertoli cells and limits paracellular diffusion, rendering transporter proteins indispensable for selective substance exchange. Leydig cells import cholesterol via lipophilic carriers and export steroid precursors through ATP-binding cassette (ABC) transporters to sustain androgen biosynthesis. Within seminiferous tubules, germ cells depend on organic anion transporting polypeptides (OATPs) and sodium-dependent carriers to internalise sulphated steroids for intracellular deconjugation and receptor activation. In the epididymis and seminal vesicles, epithelial cells employ a repertoire of solute carrier (SLC) proteins and efflux pumps to regulate the composition of luminal fluid crucial for sperm maturation and motility. Recent developments in immortalised human cell models, quantitative mass spectrometry and single-cell transcriptomics have uncovered the regulation, substrate specificity and kinetic parameters of these transporter systems. A deeper comprehension of these pathways is essential for optimising drug delivery to the testis, informing male contraceptive development and assessing reproductive toxicity of xenobiotics. Genetic polymorphisms and pathological disruption of transporters further modulate barrier permeability, with profound consequences for male fertility and endocrine treatment outcomes.
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Technical terms
Blood–testis barrier (BTB): A Sertoli cell junctional complex restricting paracellular diffusion.
Solute carrier (SLC) proteins: Membrane carriers mediating uptake and efflux of solutes.
ATP-binding cassette (ABC) transporters: Energy-dependent efflux pumps for diverse substrates.
Organic anion transporting polypeptide (OATP): Facilitator of amphipathic anion uptake across membranes.
Sulfated steroids: Conjugated steroids requiring transporters for cellular entry.
Xenobiotics: Exogenous compounds including drugs and environmental chemicals.
References
- Membrane Transporters for Sulfated Steroids in the Human Testis - Cellular Localization, Expression Pattern and Functional Analysis. PLOS ONE (2013).
- Generation of a hTERT-Immortalized Human Sertoli Cell Model to Study Transporter Dynamics at the Blood-Testis Barrier. Pharmaceutics (2020).
- Involvement of TauT/SLC6A6 in Taurine Transport at the Blood–Testis Barrier. Metabolites (2022).
- Membrane Transporters and Carriers in Human Seminal Vesicles. Journal of Clinical Medicine (2022).
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