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目的 研究不同剂量重组人肿瘤坏死因子受体突变体-Fe融合蛋白[rhTNFR(m):Fc]单次皮下给药对中国健康志愿者血浆中肿瘤坏死因子-α(rTNF-α)表达水平的影响.方法 研究纳入56例健康成年志愿者,分为6个剂量组,分别腹部皮下注射rhTNFR(m):Fc 10,20,35,50,65,75 mg,测定给药前(0 h),给药后4,48,96,168,216,264,312,384,480 h的血浆中游离TNF-α和总TNF-α的浓度.结果 单次给药0～264 h后,各个剂量组志愿者体内游离TNF-α和总TNF-α浓度均出现了显著升高;在给药264～ 480 h后,血浆中游离TNF-α和总TNF-α浓度逐渐下降;给药后480 h,游离TNF-α浓度几乎降至正常.在10～75 mg剂量内,血浆中游离TNF-α和总TNF-α在体内的暴露量(Cmax)与rhTNFR(m):Fc的剂量之间无明显的线性相关性.结论 中国健康志愿者单次给予rhTNFR(m):Fc后,可引起血浆中游离TNF-α和总TNF-α水平的升高,因此,血浆中游离TNF-α和总TNF-α水平可能并不适合作为该类药物的药效学评价指标.“,”Objective To access the effects of different doses of recombinant fusion protein of human tumor necrosis factor receptor mutant and Fc fragment [rhTNFR(m):Fc] after a single subcutaneous injection on the plasma concentration of tumor necrosis factor-α (TNF-or) in Chinese healthy volunteers.Methods A total of 56 healthy Chinese volunteers were randomly divided into 6 groups to receive a single injection of 10,20,35,65,75 mg of rhTNFR(m):Fc.The plasma concentrations of TNF-α and total TNF-α were determined at 1 h pre-dose and at 4,48,96,168,216,264,312,384,480 h post-dose.Results After administration of rhTNFR(m):Fc at 0-264 h,the plasma concentrations of free TNF-α and total TNF-α increased significantly in the each group.At 264-480 h post-dose,the concentration of them began to decrease,and at 480 h the concentration of free TNF-α almostly decreased to normal levels.In the dose range of 10-75 mg,the exposure of free TNF-α and total TNF-α (Cmax) had no significant correlation with the dose of rhTNFR (m):Fc.Conclusion After giving the single dose of rhTNFR (m):Fc,there was an increase of free and total TNF-α plasma concentration in Chinese healthy volunteers.As a result,the plasma concentration of free and total TNF-α may not be a suitable pharmacodynamic evaluation index.