Human sperm membrane antigens extracted by deoxycholate (DOC) were used to immunizeBALB/c mice.Hybrid cell lines secreting sperm-specific monoclonal antibodies were generatedby cell fusion in a semi-solid medium and s...Human sperm membrane antigens extracted by deoxycholate (DOC) were used to immunizeBALB/c mice.Hybrid cell lines secreting sperm-specific monoclonal antibodies were generatedby cell fusion in a semi-solid medium and screened by indirect immunofluorescent assay usinglive and methanol-fixed sperm.Out of 850 hybrid clones from cell fusion,28 were shownto secrete sperm-specific antibodies which reacted with the acrosome,equatorial segment,whole surface plasma membrane or tail of spermatozoa.Finally,seven hybrid cell lineswere established and shown to secrete monoclonal antibodies which had no cross-reactivitywith arty human tissues other than testis and sperm.The majority were also shown toinhibit fertilization of mouse oocytes in vitro and human sperm penetration of zona-freehamster ova.Western blot analysis revealed that some of these antibodies reacted withsperm membrane antigens of distinct molecular size.展开更多
Objective To investigate the feasibility and optimal regimen of orally administration of low dose gossypol acetic acid （GA） combined with methyltestosterone （MT） plus ethinyl estradiol （EE） for contraception in ...Objective To investigate the feasibility and optimal regimen of orally administration of low dose gossypol acetic acid （GA） combined with methyltestosterone （MT） plus ethinyl estradiol （EE） for contraception in males.Methods Wistar male rats were randomly assigned into four groups, 20 in each group. Animals in group A or B were administered daily with 1% methyl cellulose or GA （12 mg/kg） suspended in 1% methyl cellulose, respectively. Rats in group C or D took firstly GA 12 mg/kg＋MT 20 mg/kg＋EE 0.1 mg/kg or MT 20 mg/kg＋EE 0.1 mg/kg, in asuspension with 1% methyl cellulose, via gastric intubation. After the infertilities were initiated（6 weeks for group C, 8 weeks for group D）, GA was served alone while MT＋EE were withdrawn in rats of groups C and D. The treatment was ceased after 18 weeks and some males from group C were permitted to recover. Fertility testing, 10 males per group, was served for determining infertility or restoration of fertility in treated rats. Examinations of histology and biochemistry in treated rats were used to examine the morphologic influences on sperm, testis, epididymides and viscera, and biochemical changes in blood. The growth and development of F1 generation of the rats would also be tested in a series of behavioral tests.Results Ten rats from group C were infertile at week 6 after treatment, and the fulfilled infertility was maintained with low-dose GA （12 mg/kg） only daily. Six weeks after cessation of treatment, all of treated males recovered their fertility. However, 8 of 10 rats from group D were in sterility at 6th week of treatment and all at 8th week of treatment, but the infertility could not be kept with the similar dose GA alone later on. Moreover, no adverse effects were found in our present experiments.Conclusion Administration of oral low dose GA combined with MT and EE as loading dose could successfully induce infertility in short term, whereafter the efficacy could completely be maintained by similar low dose of GA alone for long term. 展开更多
基金This study was partly supported by a Biotechnology Career Fellowship awarded to Yang Yuzhou by the Rockefeller Foundation
文摘Human sperm membrane antigens extracted by deoxycholate (DOC) were used to immunizeBALB/c mice.Hybrid cell lines secreting sperm-specific monoclonal antibodies were generatedby cell fusion in a semi-solid medium and screened by indirect immunofluorescent assay usinglive and methanol-fixed sperm.Out of 850 hybrid clones from cell fusion,28 were shownto secrete sperm-specific antibodies which reacted with the acrosome,equatorial segment,whole surface plasma membrane or tail of spermatozoa.Finally,seven hybrid cell lineswere established and shown to secrete monoclonal antibodies which had no cross-reactivitywith arty human tissues other than testis and sperm.The majority were also shown toinhibit fertilization of mouse oocytes in vitro and human sperm penetration of zona-freehamster ova.Western blot analysis revealed that some of these antibodies reacted withsperm membrane antigens of distinct molecular size.
文摘Objective To investigate the feasibility and optimal regimen of orally administration of low dose gossypol acetic acid （GA） combined with methyltestosterone （MT） plus ethinyl estradiol （EE） for contraception in males.Methods Wistar male rats were randomly assigned into four groups, 20 in each group. Animals in group A or B were administered daily with 1% methyl cellulose or GA （12 mg/kg） suspended in 1% methyl cellulose, respectively. Rats in group C or D took firstly GA 12 mg/kg＋MT 20 mg/kg＋EE 0.1 mg/kg or MT 20 mg/kg＋EE 0.1 mg/kg, in asuspension with 1% methyl cellulose, via gastric intubation. After the infertilities were initiated（6 weeks for group C, 8 weeks for group D）, GA was served alone while MT＋EE were withdrawn in rats of groups C and D. The treatment was ceased after 18 weeks and some males from group C were permitted to recover. Fertility testing, 10 males per group, was served for determining infertility or restoration of fertility in treated rats. Examinations of histology and biochemistry in treated rats were used to examine the morphologic influences on sperm, testis, epididymides and viscera, and biochemical changes in blood. The growth and development of F1 generation of the rats would also be tested in a series of behavioral tests.Results Ten rats from group C were infertile at week 6 after treatment, and the fulfilled infertility was maintained with low-dose GA （12 mg/kg） only daily. Six weeks after cessation of treatment, all of treated males recovered their fertility. However, 8 of 10 rats from group D were in sterility at 6th week of treatment and all at 8th week of treatment, but the infertility could not be kept with the similar dose GA alone later on. Moreover, no adverse effects were found in our present experiments.Conclusion Administration of oral low dose GA combined with MT and EE as loading dose could successfully induce infertility in short term, whereafter the efficacy could completely be maintained by similar low dose of GA alone for long term.
