变活霉素诱导人红白血病细胞K－562向红系方向分化作用的研究

新蒽环类抗生素变活霉素由五种组分组成：变活霉素Ａ、Ｂ、Ｃ、Ｄ和７－脱氧变活霉酮Ａ。变活霉素各组分体外抑制人红白血病Ｋ－５６２细胞生长和诱导其分化活性各不相同。经联苯胺染色，变活霉素Ｃ诱导后Ｋ－５６２细胞血红蛋白表达百分率为８６％。联苯胺染色阳性细胞最大值出现在第五或第六天；去除药物后，分化细胞为部分可逆性；诱导细胞失去在软琼脂上克隆生长的能力。与其它已知蒽环类抗生素比较，变活霉素Ｃ的促分化动力学变化与阿霉素、表阿霉素和柔红霉素相似。但变活霉素Ｃ较阿克拉霉素Ａ促分化活性要强。构效关系研究表明，蒽环类抗生素的促分化活性与蒽环上Ｃ＿３、Ｃ＿１１或Ｃ＿９或Ｃ＿１０位的取代基以及Ｃ＿７位的取代糖有很大关系。

Induction of Erythroid Differentiation of HumanErythroleukemia K-562 Cells by Mutactimycin

Mutactimycin,a new anthracycline antibiotic,consists of 5 components: mutac-timycin A,B,C,D and 7-deoxymutactimycinone A. Mutactimycin components differ from each other in suppressing proliferation and inducing differentiation of human erythroleukemia K-562 cells. Determined by benzidine staining, the percentage of K-562 cells with hemoglobin expression was86% by mutactimycin C. The peak percentage of benzidine positive cells appeared on day 5 or 6.The differentiated cells were partially reversed after drug removal.The induced cells lost the clonogenicity in soft-agar. The kinetics of differentiation induced by mutactimycin C, in comparison with other known anthracycline antibiotics,was similar to that by doxorubicin, epirubicin anddaunorubicin. Mutactimycin C was more active than aclarubicin A. The structure-activity relationship for mutactimycin components suggested that the substituting groups on C_3, C_11, and the saccharide on C_7 might be important for their activities.