双歧杆菌脂磷壁酸对深部白色念珠菌感染小鼠细胞免疫的影响

目的：观察双歧杆菌脂磷壁酸（BLTA）对深部白色念珠菌感染小鼠细胞免疫功能的影响。方法通过尾静脉注射白色念珠菌建立免疫低下小鼠深部白色念珠菌感染模型，观察BLTA处理对小鼠胸腺指数、脾脏指数、脾淋巴细胞增殖活性、NK细胞杀伤活性及血清细胞因子水平的影响。结果免疫低下小鼠深部感染白色念珠菌后，小鼠胸腺指数、脾脏指数和脾脏淋巴细胞增殖活性轻度下降（P＞0．05），NK细胞杀伤活性明显下降（P＜0．05），IL‐2、IL‐4和INF‐γ水平轻微升高（P＞0．05），IL‐10水平明显升高（P＜0．05）；BLTA处理后，小鼠胸腺指数、脾脏指数、脾淋巴细胞增殖活性和NK细胞杀伤活性明显升高（P＜0．01），血清IL‐2和IN F‐γ水平明显升高（ P＜0．05），IL‐4变化不大，IL‐10明显降低（ P＜0．01）。结论 BL T A可改善免疫低下小鼠的免疫功能状态，恢复甚至增强深部感染念珠菌后受到抑制的细胞免疫应答。

Effect of bifidobacterial lipoteichoic acid on cellular immunity of mice with systemic Candida albicans infection

Objective To observe the effect of bifidobacterial lipoteichoic acid (BLTA) on cellular immunity of mice with systemic Candida albicans infection .Methods Systemic C .albicans infection model in immunocompromised mice were established by injecting standard strain of C .albicans via caudal vein .The effects of BLTA on thymus index ,spleen index ,splenic lymphocytes proliferation and NK cells cytotoxicity were observed as well as serum levels of cytokines .Results After systemic C .albicans infec‐tion in immunocompromised mice ,thymus index ,spleen index and splenic lymphocytes proliferation activity were decreased (P>0 .05) ,NK cells cytotoxicity was decreased significantly (P< 0 .05) ,IL‐2 ,IL‐4 and INF‐γ levels were increased slightly (P>0 .05) ,IL‐10 levels were increased significantly(P<0 .05) .After treated by BLTA ,thymus index ,spleen index ,splenic lymphocytes proliferation and NK cells cytotoxicity were increased significantly (P<0 .01) ,IL‐2 and INF‐γ levels were increased significantly (P<0 .05) ,IL‐4 levels showed little change ,IL‐10 levels were decreased significantly (P<0 .01) .Conclusion BLTA can improve immune status of immunocompromised mice ,which can restore and enhance the compromised cellular immunity of mice with sys‐temic C .albicans infection .