Anti-infective potential of hydroalcoholic extract of Phyllanthus emblica seeds against selected human-pathogenic bacteria.
Infect Disord Drug Targets. 2019 Aug 21. Epub 2019 Aug 21. PMID: 31433763
INTRODUCTION: In context of the global threat of antimicrobial resistance among pathogenic bacteria against conventional bactericidal antibiotics, investigation on complementary/ alternative approaches to manage bacterial infections is warranted. Present study aimed at investigating the anti-pathogenic potential of Phyllanthus emblica seed extract (PESE) against four different pathogenic bacteria.
METHODS: Hydroalcoholic extract of P. emblica seeds was tested for its possible in vitro quorum-modulatory potential against Chromobacterium violaceum, Serratia marcescens, Pseudomonas aeruginosa, and Staphylococcus aureus through broth dilution assay. In vivo efficacy of PESE was assayed employing Caenorhabditis elegans as the model host for these four pathogens.
RESULTS: PESE was found to exert in vitro quorum-modulatory effect on C. violaceum, S. marcescens, P. aeruginosa, and S. aureus at≥50 µg/mL. This extract could curb the haemolytic activity of all the four test bacteria by 23-65%, inhibit biofilm formation, and was also able to modulate their antibiotic susceptibility and catalase activity. Susceptibility of P. aeruginosa and S. aureus to lysis by human serum was enhanced under the influence of this extract by 23% and 49% respectively. Repeated exposure of both these notorious pathogens to PESE did not induce resistance in them. In vivo assay confirmed the protective effect of this extract on C. elegans, when challenged with the PESE-treated pathogenic bacteria. PESE also showed notable prebiotic potential by promoting the growth of three probiotic strains.
CONCLUSION: To the best of our awareness, this is the first report on quorum-modulatory potential of P. emblica seed extract, validating its anti-infective potential and prebiotic property.