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Characterization of an Enterococcus faecalis bacteriophage SFQ1 as a potential therapeutic agent.

ABSTRACT: Enterococcus faecalis is a well-established resident of the human gastrointestinal tract and is also a major cause of human infections. Unfortunately, therapeutic options for E. faecalis infections remain limited, particularly with the emergence of vancomycin-resistant strains in hospital settings. Consequently, there has been a renewed interest in phage therapy as an alternative to antibiotics. In this study, we have isolated a bacteriophage, vB_EfaS-SFQ1, from hospital sewage, which effectively infects E. faecalis strain EFS01. Phage SFQ1 is a siphovirus and exhibits a relatively broad host range. Furthermore, it has a short latent period of approximately 10 min and a large burst size of about 110 PFU/cell at a multiplicity of infection (MOI) of 0.01, and it could effectively disrupt the biofilms formed by E. faecalis. Thus, this study provides a detailed characterization of E. faecalis phage SFQ1, which has great potential for treating E. faecalis infections.

SUBMITTER: Song F

PROVIDER: S-EPMC10324664 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature

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Characterization of an Enterococcus faecalis bacteriophage SFQ1 as a potential therapeutic agent.

Song Fuqiang F Sheng Jun J Tan Jishan J Xie Huajie H Wang Xiaoyu X Guo Wenqiong W

Frontiers in microbiology 20230622

Enterococcus faecalis is a well-established resident of the human gastrointestinal tract and is also a major cause of human infections. Unfortunately, therapeutic options for E. faecalis infections remain limited, particularly with the emergence of vancomycin-resistant strains in hospital settings. Consequently, there has been a renewed interest in phage therapy as an alternative to antibiotics. In this study, we have isolated a bacteriophage, vB_EfaS-SFQ1, from hospital sewage, wh ...[more]

PMID: 37426023

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Project description:BackgroundIn nosocomial settings, vancomycin-resistant Enterococcus faecalis is a major health threat leading to increased morbidities, mortalities, and treatment costs. Nowadays, several approaches are under investigation to enhance the activity of or replace the traditional antibiotics. Bacteriophage therapy was sought as a potential approach for combating E. faecalis infections. The present study focuses on isolating and characterizing bacteriophage against clinical multi-drug resistant (MDR) E. faecalis strain Lb-1492. The phage stability, lytic activity, host-range, latent period, burst size, the ability to detach the pre-formed biofilm and destroy entrapped cells were investigated. The phage genome was purified, sequenced, and subjected to bioinformatics analysis for identifying and characterizing its features, as well as, the suitability for clinical application. Finally, the ability of the phage to rescue mice from deadly, experimentally induced E. faecalis bacteremia was evaluated.ResultsA virulent phage was isolated from sewage water against a clinical MDR E. faecalis isolate. Morphological and genomic studies indicated that the phage belongs to the Efquatrovirus genus, with a long tail, icosahedral head and a linear double-stranded DNA genome of approximately 42.9 kbp. The phage was named vB_Efa_ZAT1 (shortly ZAT1). It demonstrated a shorter latent period and larger burst size than regular-tailed phages, and a characteristic stability over a wide range of pH and temperatures, with the optimum activity at pH 7.4 and 37 °C, respectively. Phage ZAT1 showed a narrow spectrum of activity and a characteristic biofilm disruption ability. The phage managed successfully to control E. faecalis-induced bacteremia in mice models, which was lethal within 48 h in the control group. An intraperitoneal injection of 3 × 108 PFU of the phage solution given 1 h after the bacterial challenge was sufficient to save all the animals, completely reversing the trend of 100% mortality caused by this bacterium.ConclusionsPhage therapy can be a promising alternative to traditional antibiotics in the post-antibiotic era with a significant antimicrobial and antibiofilm activities against MDR E. faecalis.

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Characterization of an Enterococcus faecalis bacteriophage SFQ1 as a potential therapeutic agent.

Publications

Characterization of an <i>Enterococcus faecalis</i> bacteriophage SFQ1 as a potential therapeutic agent.

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