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• W2067392953 abstract "Capacitation (CAP) and acrosome reaction (AR) are sequential processes of sperm activation. Beside the known ionic, membrane, and transduction events and final release of proteolytic enzymes that help sperm movement toward the egg, chromatin changes, such as a physiological remodeling, are also possible. Our aims were to ascertain that CAP and AR do not induce DNA damage and to evaluate changes occurring in the human sperm head during these physiological processes using cytochemical stains. Percollpurified spermatozoa from normal donors were incubated in Biggers, Whitten, and Whittingham medium ± fetal cord serum ultrafiltrate (CAP inducer) and then with lysophosphatidylcholine (AR inducer). CAP and AR were associated with increases in aniline blue (AB, for histones; ∼70%) and toluidine blue (TB, for chromatin compaction; ∼40%) staining but had no influence on that of chromomycin A3 (for protamines). The increase (∼40%) in iodoacetamide-fluorescein (IAF, for sulfhydryl groups) staining observed during CAP was absent after AR. CAP and AR did not damage DNA (percentage of DNA fragmentation index remained low) nor affect histone content. CAP, and even more AR, primed sperm heads to decondense (∼80% and ∼140% increases, respectively) when challenged with sodium dodecyl sulfate + dithiothreitol. Interestingly, induced decondensation correlated with all other tests (CAP, AB, TB, and IAF). Therefore, the data strongly support a physiological remodeling of nondamaged human sperm chromatin during CAP and AR, and modifications are probably interlinked and help prepare chromatin for postfertilization events." @default.
• W2067392953 created "2016-06-24" @default.
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• W2067392953 date "2012-03-08" @default.
• W2067392953 modified "2023-10-13" @default.
• W2067392953 title "Human Sperm Chromatin Undergoes Physiological Remodeling During In Vitro Capacitation and Acrosome Reaction" @default.
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• W2067392953 doi "https://doi.org/10.2164/jandrol.111.015982" @default.
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