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[Effect of butyl alcohol extract of Baitouweng Decoction on vaginal mucosal neutrophil chemotaxis in vulvovaginal candidiasis mice].

To investigate the effects of butyl alcohol extract of Baitouweng Decoction(BAEB) on neutrophil chemotaxis in vaginal mucosa of mice with vulvovaginal candidiasis(VVC). Seventy-two SPF female Kunming mice were randomly divided into normal control group, model group, fluconazole group, BAEB low-dose group, middle-dose group and high-dose group. Subcutaneous injection of estradiol benzoate was conducted to induce pseudo-estrus, and then 2×10~6 CFU·mL~(-1)of Candida albicans was inoculated into vaginal lumen, followed by drug treatment for 7 days. Gram staining was used to observe the morphological changes of C. albicans in vagina; vaginal fungal load was detected on agar plate. Histological changes of vaginal tissues in mice were observed by HE staining. Lactate dehydrogenase(LDH), interleukin-6(IL-6) and tumor necrosis factor(TNF-α) levels in mouse lavage fluid were detected by enzyme-linked immunosorbent assay(ELISA). Neutrophils in vaginal lavage fluid was observed and counted by using Pap smear. The levels of IL-8 and MIP-2 in vaginal mucosa were detected by ELISA. IL-8 and MIP-2 mRNA levels in vaginal mucosa of mice were detected by qRT-PCR. The results showed that as compared with the normal group, VVC model group had a large number of hyphae and a high level of fungal loadinvagina. The vaginal mucosa was completely destroyed, the number of neutrophils increased, and the protein and mRNA levels of IL-8 and MIP-2 were up-regulated. After BAEB treatment, the hyphae of the treatment group was decreased, the fungal load was decreased, the impaired mucosa showed different degrees of improvement, the inflammatory factors were decreased to varying degrees, and the protein and mRNA levels of chemokine IL-8 and MIP-2 were down-regulated. In conclusion, BAEB may be used to treat VVC by inhibiting vulvovaginal candidiasis via blocking neutrophils recruitment into vagina.