Rat Sperm Surface Mannosidase Is First Expressed on the Plasma Membrane of Testicular Germ Cells

• Published in: Biology of reproduction Vol. 59; no. 6; pp. 1288 - 1295
• Main Authors: Pereira, B M, Abou-Haila, A, Tulsiani, D R
• Format: Journal Article
• Language: English
• Published: Madison, WI Society for the Study of Reproduction 01.12.1998
• Subjects: alpha-Mannosidase; Animals; Biological and medical sciences; Cell Fractionation; Cell Membrane - enzymology; Cell Separation; Fundamental and applied biological sciences. Psychology; Immunosorbent Techniques; Male; Mammalian male genital system; Mannosidases - metabolism; Morphology. Physiology; Oligosaccharides - metabolism; Rats; Rats, Sprague-Dawley; Spermatozoa - enzymology; Testis - cytology; Vertebrates: reproduction; Spermatozoa; Rat; Enzyme; Rodentia; Germinal cell; Testicle; Male genital system; Vertebrata; Mammalia; Enzymatic activity; Glycosidases; Plasma membrane; α-Mannosidase; Hydrolases; O-Glycosidases
• ISSN: 0006-3363; 1529-7268
• DOI: 10.1095/biolreprod59.6.1288

In previous publications (Tulsiani et al., Biochem J 1993; 290:427–436 and Tulsiani et al., Dev Biol 1995; 167:584–595), we reported that sperm surface mannosidase is present in rat testis and is modified during spermatogenesis and sperm maturation. The present studies were directed towards examining the origin of α- d -mannosidase activity present on fertile spermatozoa. Mixed germ cells prepared after sequential enzymatic digestions of rat testis were separated by unit gravity sedimentation using 2–4% linear bovine serum albumin gradient. Fractions enriched in spermatocytes, round spermatids, and condensed/elongated spermatids (> 95% pure cells) were separately pooled and assayed for [ 3 H]Man 9 -mannosidase activity before (intact) and after lysis with Triton X-100. Interestingly, the cells contained a significant level of α- d -mannosidase activity. Approximately 70% of the total [ 3 H]Man 9 -mannosidase activity present in the detergent-solubilized germ cell extract cross-reacted with anti-rat sperm mannosidase, and 25% of the activity cross-reacted with anti-Golgi mannosidase I. This result indicates that most of the mannosidase activity present in the germ cell extract is antigenically similar to the enzyme present on the cauda spermatozoa. Using cell fractionation techniques, we obtained evidence suggesting that the germ cell-associated mannosidase activity is an integral component of the plasma membranes. Taken together, these results indicate that sperm surface mannosidase is first expressed on the testicular germ cells.