血链球菌胞内蛋白及膜蛋白分别对热带念珠菌生物膜作用的研究

Studies of the Effects of Intracellular Proteins and Membrane Proteins in Streptococcus Sanguis on Biofilm of Candida Tropicalis

目的:提取血链球菌标准株ATCC10556的胞内蛋白及膜蛋白,研究血链球菌胞内蛋白及血链球菌膜蛋白对热带念珠菌生物膜的生物学作用。方法:参照Fujimura[1]方法分离血链球菌胞内蛋白有效成分,使之作用于热带念珠菌生物膜,并以激光共聚焦显微镜观察热带念珠菌生物膜厚度的变化。参照碳酸钠梯度离心法[2]提取膜蛋白,观察其对热带念珠菌及其生物膜是否具有抑制作用。结果:在胞内蛋白作用下,24h内热带念珠菌生物膜厚度明显变薄与阴性对照组相比有显著差异,并且12h效果最为显著(P<0.05)。膜蛋白作用下的热带念珠菌生物膜厚度与阴性对照组相比未见明显差异。结论:血链球菌胞内蛋白对热带念珠菌生物膜具有显著的抑制作用。血链球菌膜蛋白对热带念珠菌及其生物膜无抑制作用。

Objective： To extract intracellular and membrane proteins from Streptococcus sanguis（ATCC10556）, and investigate their mechanism of action on Candida tropicalis biofilms. Methods： Intracellular proteins were isolated from Streptococcus sanguis by the method of Fujimura and were applied to Candida tropicalis biofilms. Then observation of changes on thickness of biofilms was taken. We extract membrane proteins by sodium carbonate gradient centrifugation, and judge whether they have inhibition on Candida tropicalis and biofilms or not. Results： Thickness of Candida tropicalis biofilms changed significantly in 24h with the action of intracellular proteins, and it had the most obvious effect within 12h. There was no significant difference on thickness of Candida tropicalis biofilms between membrane proteins and negative control groups. Conclusions： Intracellular proteins of Streptococcus sanguis have notable inhibition on biofilms of Candida tropiealis. Membrane proteins of Streptococcus sanguis have no inhibition on Candida tropicalis and their biofilms.