康乐霉素C对T—和B—淋巴细胞活化的抑制作用

目的：阐明康乐霉素Ｃ对脾细胞增殖和Ｔ－细胞亚型的作用。方法：氚掺入法或噻唑蓝比色法测定细胞增殖；用荧光激活细胞分选仪测定细胞亚群；曲利苯蓝排斥法测定细胞存活率。结果：Ｋａｎ８，４０，８０和４００ｎｍｏｌ．Ｌ＾－１除抑制丝 同种异型抗原刺激的小鼠脾细胞增殖外；与Ｃｉｃ不同，抑制ＬＰＳ刺激的脾细胞增殖；使Ｌ３Ｔ４＾｜Ｌ－细胞亚型比倒置；

Suppressive effect of kanglemycin C on T- and B-lymphocyte activation.

AIM: To elucidate the suppressive effect of kanglemycin C (Kan) on lymphocyte proliferation and T-lymphocyte subsets. METHODS: Splenocyte proliferation was quantified with [3H]thymidine ([3H]TdR) pulsing method or 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) colorimetery. L3T4+ and Lyt2+ T-cell subsets were measured with fluorescence-activated cell sorter (FACS). Splenocyte viability was assessed with trypan blue exclusion. RESULTS: Like ciclosporin (Cic), Kan 8, 40, 80, and 400 nmol.L-1 inhibited the proliferation of 20%-80% incubated mouse splenocytes stimulated by concanavalin A (Con A) 5 mg.L-1, phytohemagglutinin (PHA) 5 mg.L-1, tetradecanoylphorbol acetate (TPA) 10 micrograms.L-1 + ionomycin (IM) 0.5 mg.L-1, and alloantigen (mixed lymphocyte reaction). Kan had no toxicity to the splenocytes at the treated doses. Suppression by Kan was declined with addition time of Kan after culture onset. Furthermore, the suppressive effect of Kan on splenocyte proliferation stimulated by lipopolysaccharides (LPS) 10 mg.L-1 was similar to that on splenocyte proliferation mediated by Con A. Unlike Cic, Kan reversed the ratio of L3T4+/Lyt2+ T-cell subsets. CONCLUSION: Kan had a suppressive action on proliferation of T- and B-lymphocytes and had a selective effect on helper-inducer T-lymphocyte (Th) subset from Cic. Suppression by Kan was time-dependent and not associated with toxicity of Kan.