卡氏支孢霉系统感染小鼠模型的建立

Experimental Study on the Pathogenicity of Cladosporium carrionii in Mice

目的采用卡氏支孢霉建立着色真菌病动物模型,并探讨卡氏支孢霉对小鼠的致病性。方法小鼠分为健康和免疫抑制组,腹腔接种卡氏支孢霉,30d时处死进行肉眼观察、病理及真菌检查。结果健康组和免疫抑制组小鼠感染发病率均为100%,腹腔内脏及系膜均见多发性黑色结节,组织病理H-E染色、PAS染色及真菌直接镜检均可见棕色菌丝及硬壳细胞,培养见卡氏支孢霉生长。健康组炎症反应较免疫抑制组强。结论卡氏支孢霉无需经动物转种恢复毒力,直接腹腔接种免疫抑制和健康小鼠均可成功建立着色真菌病模型;本模型可以作为研究着色真菌病发病机制的一个手段。

Objective To develop a murine model of chromomycosis by using Cladosporium carrioni and explore the pathogenicity of Cladosporium carrio nii in mice. Methods The suspension of Cladosporium carrioni was inoculated to two groups of mice, the immunocompetent mice and the immunosuppressed mice, b y intraperitoneal route using 1 ml inoculum containing 108 conidia/mL. All mice were sacrificed 30 days after inoculation, and then macroscopic examination, his topathology and fungal culture were performed. Results The morbidity in both g roups was 100% according to the dark brown hyphae and sclerotic bodies found in histopathologic examination and fungal culture. Macroscopic examination found th at the adhesion among the internal organs in immunocompetent mice was more sever e than that in immunosuppressed mice. Histopathologic sections showed that necro sis and inflammatory infiltration in immunocompetent mice were more obvious than those in immunosuppressed mice. Conclusions The virulence of Cladosporium car rionii strains is strong enough to construct experimental murine model of chromo mycosis, and animal passage of the strains is unnecessary. This murine model cou ld be used to study the pathogenesis of chromomycosis.