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不同碳源对白色念珠菌生物膜的调控作用

Modulation of Candida albicans Biofilm by Different Carbon Sources.

作者信息

Pemmaraju Suma C, Pruthi Parul A, Prasad R, Pruthi Vikas

机构信息

Molecular Microbiology Lab, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee, Uttarakhand, 247667, India.

Molecular Biology and Proteomics Lab, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee, Uttarakhand, 247667, India.

出版信息

Mycopathologia. 2016 Jun;181(5-6):341-52. doi: 10.1007/s11046-016-9992-8. Epub 2016 Feb 22.

Abstract

In the present investigation, the role of carbon sources (glucose, lactate, sucrose, and arabinose) on Candida albicans biofilm development and virulence factors was studied on polystyrene microtiter plates. Besides this, structural changes in cell wall component β-glucan in presence of different carbon sources have also been highlighted. Biofilm formation was analyzed by XTT (2,3-bis[2-Methoxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide) reduction assay. Glucose-grown cells exhibited the highest metabolic activity during adhesion among all carbon sources tested (p < 0.05). However, cells exposed to sucrose exhibited highest biofilm formation and matrix polysaccharides secretion after 48 h. The results also correlated with the biofilm height and roughness measurements by atomic force microscopy. Exposure to lactate induced hyphal structures with the highest proteinase activity while arabinose-grown cells formed pseudohyphal structures possessing the highest phospholipase activity. Structural changes in β-glucan characterized by Fourier transform infrared (FTIR) spectroscopy displayed characteristic band of β-glucan at 892 cm(-1) in all carbon sources tested. The β(1→6) to β(1→3) glucan ratio calculated as per the band area of the peak was less in lactate (1.15) as compared to glucose (1.73), sucrose (1.62), and arabinose (2.85). These results signify that carbon sources influence C. albicans biofilm development and modulate virulence factors and structural organization of cell wall component β-glucan.

摘要

在本研究中,在聚苯乙烯微量滴定板上研究了碳源(葡萄糖、乳酸、蔗糖和阿拉伯糖)对白色念珠菌生物膜形成和毒力因子的作用。除此之外,还突出了不同碳源存在下细胞壁成分β-葡聚糖的结构变化。通过XTT(2,3-双[2-甲氧基-4-硝基-5-磺基苯基]-2H-四唑-5-甲酰苯胺)还原试验分析生物膜形成。在所有测试的碳源中,葡萄糖培养的细胞在黏附过程中表现出最高的代谢活性(p < 0.05)。然而,暴露于蔗糖的细胞在48小时后表现出最高的生物膜形成和基质多糖分泌。结果还与通过原子力显微镜测量的生物膜高度和粗糙度相关。暴露于乳酸诱导具有最高蛋白酶活性的菌丝结构,而阿拉伯糖培养的细胞形成具有最高磷脂酶活性的假菌丝结构。通过傅里叶变换红外(FTIR)光谱表征的β-葡聚糖结构变化在所有测试的碳源中均显示出β-葡聚糖在892 cm(-1)处的特征峰。根据峰的面积计算,与葡萄糖(1.73)、蔗糖(1.62)和阿拉伯糖(2.85)相比,乳酸中β(1→6)与β(1→3)葡聚糖的比例较低(1.15)。这些结果表明,碳源影响白色念珠菌生物膜的形成,并调节毒力因子和细胞壁成分β-葡聚糖的结构组织。

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