Infection and Drug Resistance (Aug 2022)
Antibiofilm Activity of Essential Fatty Acids Against Candida albicans from Vulvovaginal Candidiasis and Bloodstream Infections
Abstract
Shuai Wang,1 Peng Wang,1 Jun Liu,1 Chunxia Yang,1 Qiangyi Wang,2 Mingze Su,3 Ming Wei,1 Li Gu1 1Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People’s Republic of China; 2Department of Clinical Laboratory, Beijing Hospital, Chinese Academy of Medical Sciences, Beijing, People’s Republic of China; 3Department of Clinical Laboratory, Beijing Tongren Hospital, Capital Medical University, Beijing, People’s Republic of ChinaCorrespondence: Ming Wei; Li Gu, Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, 8 Gongren Tiyuchang Nanlu, Chaoyang District, Beijing, 100020, People’s Republic of China, Tel +86-10-85231513, Email [email protected]; [email protected]: The biofilm formation of Candida albicans is an important virulence factor as it can increase tolerance to conventional antifungal drugs and the host immune system. The study aimed to assess the effect of essential fatty acids (EFAs) against biofilm formation and mature biofilms of C. albicans strains, which were isolated from vulvovaginal candidiasis and candidemia.Methods: The biofilm formation ability of C. albicans and antifungal activities of fluconazole were determined. Additionally, the effects of six EFAs [α-linolenic acid (ALA), eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), linoleic acid (LOA), γ-linolenic acid (GLA), and arachidonic acid (AA)] against C. albicans under planktonic and biofilm conditions were evaluated.Results: 94.1% of C. albicans exhibited biofilm formation capacity, and 98.5% of C. albicans were susceptible to fluconazole. The biofilms of C. albicans were highly resistant to fluconazole with minimum biofilm eradication concentration values ≥ 64 μg/mL. The EFAs attenuated biofilm formation in a dose-dependent manner, and GLA displayed a remarkable inhibitory activity against biofilm formation of C. albicans. In addition, EPA, DHA, and GLA at 0.1 mM could inhibit the biofilm formation of C. albicans without affecting the planktonic growth rate. Notably, EPA and AA at 1 mM had both inhibitory and eradication activities on C. albicans biofilms.Conclusion: This is the first study to directly compare different EFAs for their capacity to affect C. albicans biofilm formation as well as biofilm eradication. These results suggest EPA and AA could serve as potential new antifungal agents for the treatment of clinical infections caused by C. albicans biofilms.Keywords: Candida albicans, polyunsaturated fatty acids, biofilm, inhibition, eradication
