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Lytic Cycle of Bacteriophages

Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the lytic replication...
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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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Phage Therapy for Urinary Tract Infections: Progress and Challenges Ahead.

Chase J Morgan1, Haley Atkins2, Alan J Wolfe3

  • 1School of Biological Sciences, Division of Molecular Biology, University of California San Diego, La Jolla, CA, 92093, USA.

International Urogynecology Journal
|May 13, 2025
PubMed
Summary

Phage therapy offers a promising alternative to antibiotics for urinary tract infections (UTIs) due to rising antimicrobial resistance. Further research into standardized protocols, dosing, and the urinary microbiome is crucial for optimizing phage therapy efficacy in clinical settings.

Keywords:
Phage therapyUrinary phageUrinary tract infectionUrinary virome

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Bacteriophage Research

Background:

  • Urinary tract infections (UTIs) present a significant public health challenge due to increasing antimicrobial resistance.
  • Phage therapy, using bacteriophages to target bacteria, is emerging as a potential alternative or adjunctive treatment for UTIs.
  • Current clinical application of phage therapy for UTIs is limited by knowledge gaps and inconsistent research reporting.

Purpose of the Study:

  • To review the current status of phage therapy for UTIs.
  • To identify critical research priorities for optimizing phage therapy's clinical efficacy.
  • To address challenges hindering the widespread adoption of phage therapy in UTI treatment.

Main Methods:

  • A comprehensive literature review of current research on UTI phage therapy was conducted.
  • The review focused on identifying inconsistencies in phage susceptibility testing, phage characterization, and microbiological assessments.
  • Analysis of existing studies to pinpoint areas needing further investigation.

Main Results:

  • Key areas for future research include determining optimal phage dosing and routes of administration.
  • Understanding phage-host and phage-patient interactions, as well as the role of the urinary microbiome, is essential.
  • There is a need for standardized data collection and reporting, alongside robust randomized clinical trials.

Conclusions:

  • Phage therapy holds significant promise as an alternative to antibiotics for managing UTIs, particularly with rising antimicrobial resistance.
  • Standardized protocols, optimized dosing strategies, and a deeper understanding of the urinary microbiome are vital for successful phage therapy.
  • Rigorous clinical trials are necessary to establish efficacy and guide the integration of phage therapy into standard UTI treatment.