title: Alpha-1,4-glucosidase activity and the presence of germinal epithelium cells in the semen for differential diagnosis of obstructive and nonobstructive azoospermia.
abstract: Among azoospermics, the activity of seminal alpha-glucosidase (alpha G) is low in obstruction (OBS) cases, but there is no agreement regarding its value in others. With the hypothesis that a more marked decrease in alpha G activity occurs in OBS than in spermatogenesis arrest (SA), the enzyme was measured in the following groups: (1) vasectomized males (n = 15), (2) azoospermics with OBS (n = 7), (3) azoospermics with SA (n = 11), and (4) fertile males (n = 15). Patients within groups 2 and 3 had a testicular volume > or = 15 mL, no clinical evidence of abnormal epididymis, normal serum gonadotropins, and histological diagnosis. alpha G activities (mU/g protein, means +/- SD) by group were (1) 131 +/- 60, (2) 312 +/- 186, (3) 728 +/- 303, and (4) 1176 +/- 374. All between-group differences were significant (t test, p < .01), except for groups 1 vs. 2 comparison (.05 > p > .01). These results support the notion that SA is associated with a decrease in alpha G that is less marked that seen in OBS. The search for germinal epithelium cells in semen also allows discrimination between these two azoospermic groups.
authors.affiliation: División de Genética, Centro de Investigación Biomédica de Occidente, Guadalajara, Jalisco, México.
authors.forename: L
authors.initials: L
authors.lastname: Sandoval
authors.forename: M
authors.initials: M
authors.lastname: Diaz
authors.forename: F
authors.initials: F
authors.lastname: Rivas
mesh_terms: D004796:Clinical Enzyme Tests; D003937:Diagnosis, Differential; D004848:Epithelium / Q000201:enzymology / Q000473:pathology; D005640:Follicle Stimulating Hormone / Q000097:blood; D006801:Humans; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D009845:Oligospermia / Q000175:diagnosis* / Q000473:pathology; D012661:Semen / Q000166:cytology* / Q000201:enzymology* / Q000502:physiology; D013091:Spermatogenesis / Q000502:physiology; D014659:Vasectomy; D000520:alpha-Glucosidases / Q000032:analysis*
chemical_list: D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D000520:alpha-Glucosidases