title: Human sperm molecular anatomy: the enzyme 5α-reductase (SRD5A) is present in the sperm and may be involved in the varicocele-related infertility.
abstract: The most common cause of male infertility is the testicular varicocele, a condition that impairs production and decreases quality of sperm. Male fertility also strictly depends on androgens acting through their own receptor. The enzyme 5α-reductase (SRD5A) is involved in the conversion of testosterone to 5α-dihydrotestosterone, both required for the development and maintenance of male reproductive function. Here, we evaluated, by western blotting analysis, the presence of SRD5A in human ejaculated spermatozoa and evidenced differences in sperm SRD5A content between healthy donors and varicocele-affected patients. Additionally, SRD5A sperm ultrastructural localization was also assessed by transmission electron microscopy and immunogold assay. We evidenced that SRD5A enzyme is present in the human spermatozoa and that its cellular content is lowered in sperm samples from varicocele patients compared to healthy subjects. The presence of SRD5A in human ejaculated spermatozoa highlights the potential role of this enzyme in sperm physiopathology suggesting that the decrease in its content, by affecting the conversion of testosterone into 5α-dihydrotestosterone, may be an important additional mechanism involved in the harmful effect of varicocele in male fertility.
authors: Centro Sanitario, University of Calabria, 87036, Arcavacata Di Rende, Cosenza, Italy, saveria.aquila@libero.it.
authors: Saveria
authors: S
authors: Aquila
authors: Daniela
authors: D
authors: Montanaro
authors: Carmela
authors: C
authors: Guido
authors: Marta
authors: M
authors: Santoro
authors: Ida
authors: I
authors: Perrotta
authors: Serena
authors: S
authors: Gervasi
authors: Francesca
authors: F
authors: De Amicis
authors: Marilena
authors: M
authors: Lanzino
mesh_terms: D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase / Q000378:metabolism*; D000328:Adult; D006801:Humans; D007150:Immunohistochemistry; D007246:Infertility / Q000209:etiology*; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism*; D046529:Microscopy, Electron, Transmission; D016253:Microscopy, Immunoelectron; D013094:Spermatozoa / Q000201:enzymology* / Q000502:physiology / Q000648:ultrastructure; D013739:Testosterone / Q000378:metabolism; D014646:Varicocele / Q000201:enzymology* / Q000503:physiopathology
chemical_list: D008565:Membrane Proteins; D013739:Testosterone; D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase; C548467:SRD5A1 protein, human