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Opportunities and Challenges in the Use of Live Biotherapeutics to Fight Infections in the Era of Multi-Drug-Resistance

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Immunology".

Deadline for manuscript submissions: 10 March 2025 | Viewed by 2017

Special Issue Editor


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Guest Editor
Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
Interests: biofilm; biofilm-associated infections; antimicrobial peptides; new antimicrobial agents; host–pathogen interactions; virulence factors; Pseudomonas aeruginosa; Staphylococcus aureus
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Special Issue Information

Dear Colleagues,

The continuous and growing spread of drug-resistant microbial pathogens is a widely recognized global alarm destined to become one of the major public health problems in the years to come. The paucity of new antibiotics on the market demands the identification of non-traditional approaches to target multi-drug-resistant microorganisms.  Among these approaches, the use of live biotherapeutics (LB) or products thereof, is a futuristic but promising strategy against drug-resistant pathogens. A number of products may fall into the LB category, including single bacterial strains (e.g., probiotics), engineered bacterial strains, defined bacterial consortia, single phages or phage mixtures.  The general tactics entail exploiting the natural competition among living entities to control infections or restore a healthy microbiota at distinct body sites. Modalities through which LB may achieve successful eradication or prevent colonization of drug-resistant pathogens include competition for nutrients, saturation of receptors for adhesion, stimulation of immunity, dampening excessive inflammation, other than implementation of a bactericidal effect either directly (e.g., phages) or indirectly through the production of microbicidal metabolites (e.g., bacteriocins, antimicrobial peptides, organic acids, enzymes). This Special Issue aims to collect original research or review articles focusing on the use of LB or their metabolic products as a new class of antimicrobial agents in order to highlight the opportunities, but also the possible obstacles in the translation of LB to the clinic. Particularly welcome will be manuscripts focusing on, but not limited to, the following themes: multiple activities and modes of molecular actions of LB; development of in vitro and in vivo models of infections for rational LB candidate selection; combinatorial synergistic strategies among LB and other antimicrobials; modes of delivery of LB; and personalized strategies of LB administration. We expect that this Special Issue may contribute to boost our understanding on the benefits and molecular mechanisms associated with LB action, which may promote their applications in anti-infective therapy.

This Special Issue is supervised by Giovanna Batoni (University of Pisa) and assisted by Marta Bianchi (University of Pisa).

Prof. Dr. Giovanna Batoni
Guest Editor

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Keywords

  • probiotics
  • postbiotics
  • bioengineered probiotics
  • engineered bacterium
  • next-generation probiotics
  • phage
  • phage therapy
  • multi-drug-resistant organisms
  • microbiota replacement
  • live biotherapeutic product

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Published Papers (1 paper)

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13 pages, 1590 KiB  
Brief Report
Anti-Persisters Activity of Lacticaseibacillus rhamnosus Culture Filtrates against Pseudomonas aeruginosa in Artificial Sputum Medium
by Marta Bianchi, Semih Esin, Esingül Kaya, Giovanna Batoni and Giuseppantonio Maisetta
Int. J. Mol. Sci. 2024, 25(13), 7113; https://doi.org/10.3390/ijms25137113 - 28 Jun 2024
Viewed by 1703
Abstract
Persisters are antibiotic-tolerant bacteria, playing a role in the recalcitrance and relapse of many bacterial infections, including P. aeruginosa pulmonary infections in Cystic Fibrosis (CF) patients. Among novel antimicrobial strategies, the use of probiotics and their products is emerging as a particularly promising [...] Read more.
Persisters are antibiotic-tolerant bacteria, playing a role in the recalcitrance and relapse of many bacterial infections, including P. aeruginosa pulmonary infections in Cystic Fibrosis (CF) patients. Among novel antimicrobial strategies, the use of probiotics and their products is emerging as a particularly promising approach. The aim of this study was to evaluate the anti-persisters activity of culture filtrate supernatants of Lacticaseibacillus rhamnosus (LRM-CFS) against P. aeruginosa in artificial sputum medium (ASM), which resembles the CF lung environment. Planktonic persisters of two clinical strains of P. aeruginosa (PaCF1 and PaCF4) were obtained following two different procedures: (i) exposing stationary-phase cultures to cyanide m-chlorophenylhydrazone (CCCP) in LB medium; (ii) incubating stationary-phase cultures with high doses of tobramycin (128-fold MIC) in ASM. In addition, persisters from biofilm were obtained by exposing 48 h old biofilm of P. aeruginosa to 128 x MIC of ciprofloxacin. LRM-CFS at dilutions of 1:6 and 1:4 resulted in being bactericidal in ASM against both PaCF1 and PaCF4 persisters obtained after CCCP or tobramycin treatment. Moreover, LRM-CFS at dilution 1:4 caused a reduction of antibiotic-tolerant bacteria in the biofilm of both P. aeruginosa strains. Overall, LRM-CFS represents a promising adjuvant therapeutic strategy against P. aeruginosa recalcitrant infections in CF patients. Full article
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