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Microbial strategies for intracellular survival
1Institut für Medizinische Mikrobiologie und Hygiene, Fakultät für Klinische Medizin Mannheim, Universität Heidelberg, Germany.
Abstract:
Not only viruses but also certain bacteria, fungi as well as protozoa are able to reside and multiply within host cells; some of these microorganisms are facultative, others obligate intracellular hosts. They differ from each other in their mode of entry and in their strategies to survive intracellularly. Some remain in the phagocytic vacuole where they either block the fusion of lysosomes or resist the attack of the acidic milieu as well as the enzymatic digestion and multiply. Others escape from the vacuole to the cytoplasm where they travel around. This implies that chemotherapy has to respect these various intracellular life cycles. Therefore an antibiotic treatment can only be effective when the drug arrives in an active form at the special site of microbial residence.
Insights
Certain bacteria, fungi, and protozoa can live inside host cells, using different survival strategies. Effective antibiotic treatment requires drugs to reach these intracellular pathogens in an active form.
Area of Science:
- Microbiology
- Cell Biology
- Infectious Diseases
Background:
- Viruses, bacteria, fungi, and protozoa can be intracellular pathogens.
- These microorganisms exhibit diverse strategies for entry and survival within host cells.
Purpose of the Study:
- To highlight the varied intracellular life cycles of microbial pathogens.
- To emphasize the importance of drug delivery to intracellular sites for effective chemotherapy.
Main Methods:
- Review of microbial intracellular survival mechanisms.
- Analysis of factors influencing antimicrobial efficacy within host cells.
Main Results:
- Intracellular pathogens utilize distinct mechanisms to evade host defenses, such as residing in phagocytic vacuoles or escaping to the cytoplasm.
- Survival strategies include blocking lysosome fusion, resisting acidic environments, and enzymatic digestion.
Conclusions:
- Understanding diverse intracellular pathogen life cycles is crucial for developing effective antimicrobial therapies.
- Chemotherapy must ensure active drug presence at the specific site of microbial residence for successful treatment.