WR2721体内过程和辐射防护研究近况
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摘要: WR-2721被认为是最有效的化学辐射防护药,照射前30min内静脉给药100~500mg/kg有效,血浆半衰期短,随尿排出量少,能通过胎盘屏障,但不致胎儿毒性作用,不能通过血脑屏障,故对脑及脊髓无防护作用,在碱性磷酸酶作用下,脱磷酸后为WR-1065,WR-1065能与蛋白质等结合形成二硫化物,或代谢为半胱胺或亚磺酸。WR-2721对正常组织有较好的防护效果,较少防护肿瘤组织,与葡聚糖等伍用,可减少用药剂量,降低毒副作用,保持或提高防护效果。
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