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Identification, characterization, and gene expression profiling of endotoxin-induced myocarditis
Ma-Li Wong1, Fiona O'Kirwan, Nadia Khan
1Center for Pharmacogenomics, Neuropsychiatric Institute, Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine, University of California, Los Angeles, CA 90095-1761, USA. mali@ucla.edu
Summary
Endotoxin-induced myocarditis (EIM) causes cardiac dysfunction in septic shock. This study identifies EIM, revealing differential ventricle responses and novel drug targets for sepsis treatment.
Area of Science:
- Cardiovascular Pathology
- Immunology
- Molecular Biology
Background:
- Sepsis-induced cardiac dysfunction is a reversible condition.
- Myocardial depressant factors, potentially including nitric oxide, are implicated in myocyte dysfunction.
- The precise pathophysiological mechanisms of sepsis-induced myocardial injury remain unclear.
Purpose of the Study:
- To identify and characterize a novel pathophysiological entity in endotoxin-induced myocarditis (EIM).
- To investigate differential responses between the left and right ventricles in EIM.
- To identify novel molecular targets for therapeutic intervention in sepsis.
Main Methods:
- Gene expression profiling was employed to analyze myocardial responses.
- Inducible nitric oxide synthase (NOS2) mRNA induction patterns were examined.
- Histopathological analysis identified myocarditis and aseptic necrosis.
Main Results:
- Endotoxin-induced myocarditis (EIM) was identified as a distinct pathophysiological entity.
- Differential patterns of NOS2 mRNA induction were observed in the left and right ventricles.
- Focal areas of aseptic necrosis were present in the right ventricle 24 hours after systemic inflammatory response syndrome (SIRS) induction.
- Gene expression profiling revealed novel transcriptional changes, indicating spatial and temporal heterogeneity in myocardial responses.
Conclusions:
- EIM is characterized by differential ventricular responses and myocardial injury.
- Novel genes identified represent potential therapeutic targets for SIRS and sepsis.
- A stepwise, multitarget therapeutic strategy is suggested for sepsis.
- Findings may inform immunotherapy development for bioterrorism-related diseases.