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Measurement of Mitochondrial Respiration in Human and Mouse Skeletal Muscle Fibers by High-Resolution Respirometry
Published on: October 4, 2024
Microarray analysis suggests that burn injury results in mitochondrial dysfunction in human skeletal muscle
A Aria Tzika1, Dionyssios Mintzopoulos, Michael Mindrinos
1NMR Surgical Laboratory, Department of Surgery, Massachusetts General and Shriners Hospitals, Harvard Medical School, Boston, MA 02114, USA. atzika@hms.harvard.edu
International Journal of Molecular Medicine
|July 30, 2009
Summary
Severe burn injuries disrupt skeletal muscle metabolism by altering gene expression. Key mitochondrial regulators, peroxisome proliferator-activated receptors (PPARs), show significant changes, suggesting a pathway to muscle dysfunction post-burn.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Extensive burn injuries induce muscle catabolism, a complex metabolic process.
- Understanding the molecular basis of burn-induced muscle catabolism is crucial for developing therapeutic interventions.
- Skeletal muscle dysfunction is a significant complication following severe burns.
Purpose of the Study:
- To investigate the functional classification of differentially expressed genes in skeletal muscle after burn injury.
- To identify molecular mechanisms underlying muscle catabolism in pediatric burn patients.
- To explore the role of peroxisome proliferator-activated receptors (PPARs) and mitochondrial genes in burn injury.
Main Methods:
- Microarray analysis of skeletal muscle tissue from pediatric burn patients and healthy controls.
- Comparison of gene expression profiles within 10 days of burn injury.
- Functional classification of differentially expressed genes, focusing on PPARs and mitochondrial pathways.
Main Results:
- Burn injury significantly altered the expression of genes involved in cellular organization, stress response, apoptosis, and intracellular signaling.
- Expression of PPARgamma-1beta (PGC-1beta), a key mitochondrial biogenesis factor, was downregulated (P<0.0001).
- Expression of PPARdelta, PGC-1alpha, and mitochondrial uncoupling protein 2 (UCP2) was upregulated (P<0.001, P=0.0037, P=0.008, respectively).
Conclusions:
- Altered expression of PPARs and mitochondrial genes occurs early after severe burn injury.
- These gene expression changes suggest a potential for metabolic and mitochondrial dysfunction in skeletal muscle post-burn.
- Targeting PPAR signaling pathways may offer a therapeutic strategy for mitigating burn-induced muscle catabolism.
