【摘要】 目的　探讨木瓜总苷对小鼠接触性超敏反应 (CHS)的影响及部分机制。方法　采用了 2 ,4 二硝基氟苯 (DNFB)诱导小鼠CHS模型 ,采用流式细胞术检测小鼠胸腺T淋巴细胞亚型 ,MTT法检测脾脏T淋巴细胞增殖 ,ConA诱导的胸腺T淋巴细胞培养上清中TGF β1和IL 4水平检测采用ELISA法 ,IL 2活性检测采用活化的小鼠脾细胞MTT比色法。结果　于初次致敏前 5d灌胃木瓜总苷 6 0、12 0、2 4 0mg·kg-1和阳性对照药阿克他利 12 0mg·kg-1,连续给药 10d。木瓜总苷 2 4 0mg·kg-1可降低CHS小鼠脾指数和胸腺指数、木瓜总苷 6 0、12 0、2 4 0mg·kg-1均可降低CHS小鼠耳肿胀度、抑制ConA诱导的脾T淋巴细胞过度增殖 ;木瓜总苷 2 4 0mg·kg-1可降低CHS小鼠胸腺异常增高的CD4 + CD8+ 亚型T淋巴细胞比例、恢复降低的CD4 + CD8-亚型T淋巴细胞比例 ;木瓜总苷 6 0、2 4 0mg·kg-1可恢复CHS小鼠低下的CD4 -CD8-亚型T淋巴细胞比例。同时 ,木瓜总苷还可有效抑制ConA诱导的CHS小鼠胸腺T淋巴细胞培养上清液中的TGF β1和IL 2水平 ,并对同一培养上清液中的IL 4水平也有提高作用。结论　木瓜总苷对小鼠CHS有明显抑制作用 ;可有效抑制过度的脾T淋巴细胞增殖 ,调节小鼠胸腺T淋巴细胞亚群和细胞因子产生平衡更多还原

【Abstract】 Aim To investigate the effects and mechanisms of glucosides of chaenomeles speciosa (GCS) in mice with contact hypersensitivity (CHS) response. Methods CHS model in mice induced by 2,4-dinitro-I-dinitroflurobenzene (DNFB) was used in this study. Concanavalin A (Con A)-induced splenocytes proliferation was measured by the MTT colorimetric method and interleukin-2 (IL-2) activity was measured by testing its ability to support ConA-induced mice splenocytes proliferation by MTT method. Interleukin-4 (IL-4) and transforming growth factor -beta 1 (TGF-β 1) levels were determined by ELISA. T lymphocytes subsets were measured by flow cytometry. Results Similar as the control drug 4-acetylaminophenylacetic acid (actarit or Acta) (120 mg·kg -1), GCS (240 mg·kg -1) could inhibit the thymus index and spleen index in CHS mice. GCS( 60,120,240 mg·kg -1) could inhibit the ear swelling of CHS mice and could inhibit the splenocytes proliferation induced by ConA. GCS (240 mg·kg -1)decreased CD4 +CD8 +T lymphocytes subsets ratio and resumed the CD4 +CD8 -subsets ratio in CHS mice;GCS(240,60 mg·kg -1) resumed the CD4 -CD8 -subsets ratio in CHS mice. GCS also decreased the TGF-β 1 and IL-2 levels and increased the IL-4 levels in mice thymus with CHS. Conclusion GCS could inhibit mice CHS reaction and resume the balance of T lymphocytes subsets in mice thymus with CHS, and also could modulate the cytokines production by CD4 + T lymphocytes of CHS mice.更多还原