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Microbial pathogenicity and host defense mechanisms--crucial parameters of posttraumatic infections
1Department of Microbiology and Immunology, Ruhr University, Bochum, FRG.
Abstract:
Posttraumatic and postoperative infections which may be either localized or turn into sepsis are a major cause of morbidity and mortality in surgical patients. They derive from the imbalance between microbial pathogenicity factors and the host defense system. The virulence mechanisms include adhesion, chemotaxis, invasion, resistance, and production of toxins. In addition, local and/or systemic immune functions in these patients are altered. Unspecific as well as specific cellular and humoral defense mechanisms are affected. The interaction of defined microbial pathogenicity factors with immune effector cells results in the activation of a variety of inflammatory mediators; they are a prerequisite for protective immunity but also induce local or systemic damage in the host when they occur in excessive amounts or when their metabolism is inadequately controlled. The analysis of the pathophysiological events during infection in surgical patients by taking advantage of modern molecular and cell biological methods may contribute to the development of novel therapeutic strategies.
Insights
Surgical infections, a major cause of patient mortality, stem from a microbial-host defense imbalance. Understanding these complex interactions may lead to new therapeutic strategies for posttraumatic and postoperative infections.
Area of Science:
- Surgical infections
- Immunology
- Microbial pathogenesis
Background:
- Posttraumatic and postoperative infections are significant causes of morbidity and mortality in surgical patients.
- These infections arise from an imbalance between microbial virulence factors and the host's immune system.
- Altered local and systemic immune functions are characteristic of surgical patients.
Purpose of the Study:
- To analyze the pathophysiological events during infection in surgical patients.
- To explore the interaction between microbial pathogenicity factors and host immune cells.
- To identify potential targets for novel therapeutic strategies.
Main Methods:
- Analysis of pathophysiological events using modern molecular and cell biological methods.
- Investigation of microbial virulence mechanisms (adhesion, chemotaxis, invasion, resistance, toxin production).
- Assessment of host defense mechanisms (unspecific, specific cellular, and humoral).
Main Results:
- Microbial virulence factors disrupt host defense, leading to localized infections or sepsis.
- Activation of inflammatory mediators contributes to both protective immunity and host damage.
- Excessive or uncontrolled inflammatory mediator metabolism exacerbates pathological outcomes.
Conclusions:
- Understanding the intricate interplay between microbial factors and host immunity is crucial.
- Modern molecular and cell biology methods offer insights into infection pathogenesis.
- This knowledge can guide the development of innovative therapeutic approaches for surgical infections.