Elemental sulfur enhances the anti-fungal effect of Lacticaseibacillus rhamnosus Lcr35.

Autor: Kaur M; NEXBIOME Therapeutics, 22 Allée Alan Turing, 63000 Clermont-Ferrand, France; Université Clermont Auvergne, CNRS, LMGE, F-63000 Clermont-Ferrand, France., Miquel S; Université Clermont Auvergne, CNRS, LMGE, F-63000 Clermont-Ferrand, France. Electronic address: sylvie.miquel@uca.fr., Ollivier-Nakusi L; Université Clermont Auvergne, CNRS, LMGE, F-63000 Clermont-Ferrand, France., Thoral C; NEXBIOME Therapeutics, 22 Allée Alan Turing, 63000 Clermont-Ferrand, France., Vareille-Delarbre M; Université Clermont Auvergne, CNRS, LMGE, F-63000 Clermont-Ferrand, France., Bekirian C; Institut Pasteur, Université Paris Cité, INRAE USC 2019, Unité Biologie et Pathogénicité Fongiques, 25, rue du Docteur Roux, 75015 Paris, France., d'Enfert C; Institut Pasteur, Université Paris Cité, INRAE USC 2019, Unité Biologie et Pathogénicité Fongiques, 25, rue du Docteur Roux, 75015 Paris, France., Fontaine T; Institut Pasteur, Université Paris Cité, INRAE USC 2019, Unité Biologie et Pathogénicité Fongiques, 25, rue du Docteur Roux, 75015 Paris, France., Roget K; NEXBIOME Therapeutics, 22 Allée Alan Turing, 63000 Clermont-Ferrand, France., Forestier C; Université Clermont Auvergne, CNRS, LMGE, F-63000 Clermont-Ferrand, France.
Jazyk: angličtina
Zdroj: Microbes and infection [Microbes Infect] 2024 Mar-Apr; Vol. 26 (3), pp. 105286. Date of Electronic Publication: 2023 Dec 30.
DOI: 10.1016/j.micinf.2023.105286
Abstrakt: Lacticaseibacillus rhamnosus Lcr35 is a well-known bacterial strain whose efficiency in preventing recurrent vulvovaginal candidiasis has been largely demonstrated in clinical trials. The presence of sodium thiosulfate (STS) has been shown to enhance its ability to inhibit the growth of Candida albicans strains. In this study, we confirmed that Lcr35 has a fungicidal effect not only on the planktonic form of C. albicans but also on other life forms such as hypha and biofilm. Transcriptomic analysis showed that the presence of C. albicans induced a metabolic adaptation of Lcr35 potentially associated with a competitive advantage over yeast cells. However, STS alone had no impact on the global gene expression of Lcr35, which is not in favor of the involvement of an enzymatic transformation of STS. Comparative HPLC and gas chromatography-mass spectrometry analysis of the organic phase from cell-free supernatant (CFS) fractions obtained from Lcr35 cultures performed in the presence and absence of STS identified elemental sulfur (S 0 ) in the samples initially containing STS. In addition, the anti-Candida activity of CFS from STS-containing cultures was shown to be pH-dependent and occurred at acidic pH lower than 5. We next investigated the antifungal activity of lactic acid and acetic acid, the two main organic acids produced by lactobacilli. The two molecules affected the viability of C. albicans but only at pH 3.5 and in a dose-dependent manner, an antifungal effect that was enhanced in samples containing STS in which the thiosulfate was decomposed into S 0 . In conclusion, the use of STS as an excipient in the manufacturing process of Lcr35 exerted a dual action since the production of organic acids by Lcr35 facilitates the decomposition of thiosulfate into S 0 , thereby enhancing the bacteria's own anti-fungal effect.
Competing Interests: Declaration of competing interest There is no conflict of interest.
(Copyright © 2024 Institut Pasteur. Published by Elsevier Masson SAS. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: