Lysine enhances the effect of amphotericin B against Candida albicans in vitro

• Published in: Acta biochimica et biophysica Sinica Vol. 48; no. 2; pp. 182 - 193
• Main Authors: Zhao, Liuya, Jiang, Jingchen, Zhu, Zhenyu, Liao, Zebin, Yao, Xiangwen, Yang, Yu, Cao, Yingying, Jiang, Yuanying
• Format: Journal Article
• Language: English
• Published: China 01.02.2016
• Subjects: AMB; Amphotericin B - administration & dosage; Antifungal Agents - administration & dosage; Biofilms - drug effects; Candida albicans - drug effects; Candida albicans - genetics; Candida albicans - physiology; Candidiasis, Invasive - drug therapy; Drug Resistance, Fungal; Drug Synergism; Genes, Fungal - drug effects; Humans; Hyphae - drug effects; In Vitro Techniques; Lysine - administration & dosage; Membrane Potential, Mitochondrial - drug effects; Microbial Sensitivity Tests; Reactive Oxygen Species - metabolism; 两性霉素B; 体外作用; 必需氨基酸; 抗真菌作用; 白色念珠菌; 赖氨酸; Candida albicans; lysine; amphotericin B; biofilm; reactive oxygen species
• ISSN: 1672-9145; 1745-7270
• DOI: 10.1093/abbs/gmv125

Amphotericin B （AmB） is a polyene antibiotic produced by Streptomyces nodosus and has been used for 〉50 years in the treatment of acute systemic fungal infections. In the present study, we demonstrated that lysine, an essential amino acid, could enhance the effect of AmB against Candida albicans in vitro, although lysine itself did not exert a fungicidal effect. In addition, the combination of AmB with lysine could provide an enhanced action against Candida parapsilosis and Cryptococ- cus neoformans compared with AmB alone. Lysine could also enhance the antifungal effect of caspofungin or nystatin. An enhanced effect of the combination of lysine with AmB was observed for the prevention of biofilm and hypha formation. Furthermore, our results demonstrated that lysine-mediated oxidative damage, such as the generation of endogenous reactive oxygen species, may be the mechanism underlying the enhancing effect of lysine on AmB. Our results also showed that CaMCA 1 gene plays an important role in increasing the sensitivity of C. albicans cells upon AmB treatment. Using AmB together with lysine may be a promising strategy for the therapy of disseminated candidiasis.