کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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3939063 | 1253548 | 2008 | 8 صفحه PDF | دانلود رایگان |
ObjectiveTo determine the role of calcium signaling on apoptosis evoked by the reactive oxygen species H2O2 and by the physiological agonist P in human ejaculated spermatozoa.DesignLaboratory study.SettingCenter for assisted human reproduction in a hospital in Spain.Patient(s)Forty-five healthy volunteers.Intervention(s)Spermatozoa were treated with increasing concentrations of hydrogen peroxide (H2O2; 10 μM, 100 μM, and 1 mM) or with 20 μM of P for 5–120 minutes.Main Outcome Measure(s)Activation of caspase-3 and -9 as well as phosphatidylserine externalization were examined in human ejaculated spermatozoa by fluorescence methods.Result(s)Hydrogen peroxide and P induced activation of caspase-3 and -9. In addition, the effect of H2O2 and P was time dependent. Dimethyl-1,2-bis (aminophenoxy) ethane-N,N,N′,N′-tetraacetic acid loading was able to inhibit H2O2- and P-induced caspase-3 activation and phosphatidylserine externalization. Pretreatment of spermatozoa with Ru360, to block the calcium uptake into mitochondria, also was able to decrease the activation of caspase-3 and phosphatidylserine exposure that was stimulated by either H2O2 or P.Conclusion(s)These findings suggest that H2O2- and P-induced mitochondrial apoptosis is dependent on calcium signaling.
Journal: Fertility and Sterility - Volume 90, Issue 4, Supplement, October 2008, Pages 1340–1347