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Optimum treatment of intracellular infection
Abstract:
The intracellular location of some micro-organisms has been early recognised as a critical point to explain failure of antibiotic therapy to eradicate such pathogens from infected hosts. Most often parasites invade 'professional' phagocytic cells, including neutrophils, monocytes and macrophages, by resisting the intracellular bactericidal phagolysosomal pathway. Alternatively, they may invade 'non-professional' phagocytic cells (cells with fewer phagocytic and bactericidal abilities) such as endothelial cells, or even cells without lysosomes such as erythrocytes. The intracellular activity of an antibiotic depends on several factors including its ability to reach the eukaryotic cell membrane, its subcellular localisation as compared to that of the parasite, the possibility that the intracellular milieu may partially inactivate its activity, and the susceptibility of the intracellular form of the parasite. In vitro and animal models have been developed to investigate antibiotic activity against intracellular pathogens. However, it should be emphasised that only data obtained from patients give reliable information to define the optimum antibiotic regimen.
Insights
Understanding antibiotic efficacy against intracellular pathogens is key to successful treatment. This research highlights factors affecting antibiotic activity within host cells and emphasizes patient data for optimal regimens.
Area of Science:
- Microbiology
- Pharmacology
- Infectious Diseases
Background:
- Intracellular pathogens resist antibiotic therapy by residing within host cells, evading the immune system.
- Microorganisms invade professional phagocytes (neutrophils, macrophages) and non-professional cells (endothelial cells, erythrocytes).
- The intracellular environment poses challenges for antibiotic effectiveness, impacting drug delivery and pathogen susceptibility.
Purpose of the Study:
- To explore the critical role of microbial intracellular location in antibiotic treatment failure.
- To identify factors influencing antibiotic activity against intracellular pathogens.
- To underscore the importance of clinical data for optimizing antibiotic regimens.
Main Methods:
- Review of in vitro and animal models for studying antibiotic activity.
- Analysis of factors affecting antibiotic penetration and activity within eukaryotic cells.
- Emphasis on the necessity of patient-derived data for regimen definition.
Main Results:
- Intracellular pathogen location significantly impacts antibiotic treatment outcomes.
- Antibiotic efficacy is influenced by cell entry, subcellular localization, intracellular inactivation, and pathogen susceptibility.
- In vitro and animal models provide valuable insights but are limited in predicting clinical success.
Conclusions:
- The intracellular niche of pathogens is a major hurdle in eradicating infections with antibiotics.
- Optimizing antibiotic therapy requires a comprehensive understanding of drug behavior within host cells.
- Clinical data from patients are indispensable for establishing effective antibiotic treatment strategies against intracellular infections.