红树林近平滑假丝酵母菌胞外多糖在外阴阴道假丝酵母菌病模型小鼠中的效果评估

The effect of mangrove candida parapsilokis exopolysaccharide on mouse vvc model

目的了解红树林近平滑假丝酵母菌(C.parapsilokis)的胞外多糖(exopolysaccharide, EPS)更多的生物学作用。方法构建BALB/c小鼠外阴阴道假丝酵母菌病(vulvovaginal candidiasis, VVC)模型,60只雌性BALB/c小鼠(8～10周龄,24～28 g)随机均分为雌激素诱导的VVC组(V组,n=20)、胞外多糖(exopolysaccharide, EPS)干预和雌激素诱导的VVC组(E组,n=20)、仅进行雌激素化的阴性对照组(C组,n=20)和空白对照组(B组,n=20)。V组、E组和C组小鼠在接种前6 d开始皮下注射含有0.1 mg苯甲酸雌二醇的油剂0.1 mL,1次/2 d。B组皮下注射同等体积的无菌橄榄油。给药1周后,E组和V组接种白假丝酵母菌(ATCC 10231)孢子5×10^(7 ), B和C组接种等体积的PBS。接种后第4、7、14天每天随机抽选各组小鼠5只,收集各组小鼠阴道灌洗液进行菌落计数。收集小鼠的阴道局部组织进行石蜡切片HE染色和芯片检测。结果 E组和V组小鼠于接种白假丝酵母菌3～5 d后出现外阴红肿,阴道灌洗液可见豆渣样分泌物。C组和B组小鼠未见明显异常改变。小鼠阴道局部白假丝酵母菌载量并未因EPS的干预发生明显改变,但是阴道局部组织石蜡切片观察发现,中性粒细胞计数(PMN)的浸润程度明显减轻,S100A8、S100A9等表达水平下调。结论 EPS的应用可在VVC模型中具有较好的抗炎效应,这一作用与EPS对S100A8/A9的剂量依赖阻碍表达相关。

Objective To investigate the biological function of mangrove Candida parapsilokis exopolysaccharide(EPS). Methods The vulvovaginal candidiasis(VVC) model of BALB/c mice was constructed to intervene with EPS on the vagina. The local tissues of the vagina were collected for paraffin section, HE staining and microchip detection. Results PMNs infiltration was significantly reduced, and the expression levels of S100 A8 and S100 A9 were down-regulated. Conclusion The application of EPS has a good anti-inflammatory effect in the VVC model. This effect is correlated to extracellular polysaccharides on S100 A8/A9 expression in dose dependence manner.