title: Serum inhibin B as a marker for spermatogenesis.
abstract: Inhibin B generated by Sertoli cells provides negative feedback on FSH secretion. In men, inhibin B seems to be the physiologically important form of inhibin. Serum inhibin B was measured by two-site immunoenzymatic assay in 40 normal men (27 years of age) with sperm concentrations 100 +/- 9.2 x 10(6)/mL, 51 subfertile men (31 years of age) with sperm concentrations 6.8 +/- 0.8 x 10(6)/mL, 16 men with varicocele with sperm concentrations 54.3 +/- 0.8 x 10(6)/mL (31 years of age), men with hypogonadotrophic hypogonadism, men with Klinefelter syndrome, and men with obstructive and non-obstructive azoospermia. In men with normal sperm concentrations (>20 x 10(6) mL) serum inhibin B was 201 +/- 17 pg/mL and FSH 4 +/- 0.5 IU/L. Varicocele patients showed normal sperm concentrations > 20 x 10(6)/mL, normal serum inhibin B (173 +/- 21 pg/mL), and normal FSH levels (4.6 +/- 0.6 IU/L). In patients with sperm concentrations < 20 x 10(6)/mL the inhibin B level was 118 +/- 14 pg/mL and the FSH level was 10 +/- 1.1 IU/L. In all patients, except those with hypogonadotrophic hypogonadism and Klinefelter syndrome. inhibin B and FSH were inversely correlated (r = -.41, p > 0.01). There was a positive correlation between inhibin B and sperm concentrations (r = .34, p < .01). In varicocele men there was a correlation of r = .574, p < .05. Inhibin B may be a marker of exocrine testicular function and may offer an improved diagnosis of testicular dysfunction.
authors.affiliation: Department of Dermatology, Friedrich-Schiller-University, Jena, Germany. chip@derma.uni-jena.de
authors.forename: U C
authors.initials: UC
authors.lastname: Hipler
authors.forename: B
authors.initials: B
authors.lastname: Hochheim
authors.forename: B
authors.initials: B
authors.lastname: Knöll
authors.forename: J
authors.initials: J
authors.lastname: Tittelbach
authors.forename: G
authors.initials: G
authors.lastname: Schreiber
mesh_terms: D000328:Adult; D015415:Biomarkers; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007248:Infertility, Male / Q000097:blood; D007265:Inhibins / Q000097:blood*; D008297:Male; D013091:Spermatogenesis
chemical_list: D015415:Biomarkers; D007265:Inhibins