title: Transforming growth factor beta 1 enhances expression of 50 kDa protein related to 2'-5' oligoadenylate synthetase in human sperm cells.
abstract: Human cellular polypeptide factors, namely interferon-alpha, interferon-gamma transforming growth factor (TGF)-alpha, and TGF-beta 1, were analyzed for their effect on motility of human sperm cells. Both interferons caused an inhibition of sperm cell motility due to direct cytotoxic effects without inducing 2'-5' oligoadenylate [2-5(A)]synthetase activity. TGF-alpha affected neither motility nor the levels of 2-5(A) synthetase in sperm cells. TGF-beta 1 had no affect on sperm motility, yet it caused an induction of 2-5(A)synthetase activity. Western immunoblot analysis of TGF-beta 1-treated sperm indicated an enhancement of a 50 kDa protein. Metabolic labeling of sperm cells revealed biosynthesis of one major protein of 50 kDa and at least five minor proteins in the range of 30-92 kDa; the level of 50 kDa protein increased after treatment with TGF-beta 1. The treatment of sperm cells with TGF-beta 1 did not affect their penetration in zona-free hamster eggs (SPA). These results indicate that TGF-beta 1 enhances expression of a 50 kDa protein related to 2-5(A) synthetase in human sperm cells along with other minor proteins, and this increase does not affect sperm motility and SPA.
authors.affiliation: Department of Obstetrics and Gynecology, Albert Einstein College of Medicine, Bronx, New York 10461.
authors.forename: R K
authors.initials: RK
authors.lastname: Naz
authors.forename: R
authors.initials: R
authors.lastname: Kumar
mesh_terms: D015088:2',5'-Oligoadenylate Synthetase / Q000502:physiology*; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D007370:Interferon Type I / Q000502:physiology; D007371:Interferon-gamma / Q000502:physiology; D007527:Isoenzymes / Q000502:physiology; D008297:Male; D008970:Molecular Weight; D013081:Sperm Motility / Q000502:physiology; D013084:Sperm-Ovum Interactions / Q000502:physiology; D013094:Spermatozoa / Q000378:metabolism*; D016211:Transforming Growth Factor alpha / Q000502:physiology; D016212:Transforming Growth Factor beta / Q000502:physiology*
chemical_list: D007370:Interferon Type I; D007527:Isoenzymes; D016211:Transforming Growth Factor alpha; D016212:Transforming Growth Factor beta; D007371:Interferon-gamma; D015088:2',5'-Oligoadenylate Synthetase