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- W2005929671 abstract "Treatment of male rats with low dosages of cyclophosphamide causes a dramatic increase in early embryo death among their progeny without significantly affecting the general health of the male. It is hypothesized that cyclophosphamide exerts its effects by targeting specific components of spermatozoal nuclei. The purpose of the present studies was to investigate the effects of chronic cyclophosphamide treatment on spermatozoal DNA. Two approaches were pursued. The first was to determine total DNA damage by using the alkaline elution method. The second was to study spermatozoal DNA template function by using an in vitro DNA synthesis system. Adult male rats were treated with saline or cyclophosphamide (6.1 mg/kg/day) daily for 1 or 6 wk. Cauda epididymal spermatozoa were collected and subjected to alkaline elution using DNA-DNA dot hybridization to quantify the fractionated DNA. One week of treatment with cyclophosphamide caused DNA single strand breaks that could be detected only in the presence of proteinase K in the lysis solution; no DNA cross-links were observed in the animals that received 1-wk drug treatment. In contrast, 6 wk of treatment with cyclophosphamide induced a significant increase in both DNA single strand breaks and cross-links in spermatozoal nuclei; the cross-links were attributable primarily to DNA-DNA linkages. The availability of spermatozoal DNA for template function was not affected by 1 wk of treatment with cyclophosphamide but was markedly affected after 6 wk of treatment with this drug. It is proposed that during chromatin transition processes the male genome may be in an open dynamic state with many exposed sites that are vulnerable to alkylating agents. Since there is no DNA repair during spermiogenesis, damage to the genome by alkylation at this stage may be cumulative, resulting in the production of dysfunctional germ cells." @default.
- W2005929671 created "2016-06-24" @default.
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- W2005929671 date "1995-12-01" @default.
- W2005929671 modified "2023-10-07" @default.
- W2005929671 title "Damage to Rat Spermatozoal DNA after Chronic Cyclophosphamide Exposure1" @default.
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- W2005929671 doi "https://doi.org/10.1095/biolreprod53.6.1465" @default.
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