Related Experiment Video
Updated: Mar 15, 2026
A Flow Cytometry-based Assay for Measuring Mitochondrial Membrane Potential in Cardiac Myocytes After Hypoxia/Reoxygenation
Published on: July 13, 2018
The synthetic antimicrobial peptide 19-2.5 attenuates mitochondrial dysfunction in cardiomyocytes stimulated with
Lukas Martin1, Carsten Peters1, Lena Heinbockel2
11 Department of Intensive Care and Intermediate Care, University Hospital Aachen, Aachen, Germany.
Abstract:
Septic cardiomyopathy affects up to 70% of patients with septic shock and the derangement of cardiac mitochondrial function contributes to the likelihood of death. However, at present, there is no specific therapeutic drug available. The peroxisome proliferator-activated receptor (PPAR)-γ coactivator-1α (PGC-1α) and coactivator-1β (PGC-1β) modulate members of the PPARs, which regulate mitochondrial energy metabolism and the production of mitochondrial reactive oxygen species in the heart. This study investigated the potential of the newly developed synthetic antimicrobial peptide 19-2.5 (Pep2.5) to attenuate mitochondrial dysfunction in murine cardiomyocytes stimulated with serum from septic shock patients. Pep2.5 treatment attenuated the suppression of PPAR-α, PPAR-γ ( P = 0.0004 and P = 0.0001, respectively) and PGC-1α/β ( P = 0.0008 and P = 0.0147, respectively) in cardiomyocytes stimulated with serum from septic shock patients compared with untreated cells. Pep2.5 treatment enhanced the mitochondrial maximum respiration ( P < 0.0001), increased cellular ATP levels ( P < 0.0001) and reduced the production of mitochondrial reactive oxygen species. Thus, the administration of Pep2.5 may have the potential as a promising therapeutic approach in septic cardiomyopathy by attenuating mitochondrial dysfunction in the septic heart.
Insights
A new peptide, Pep2.5, shows promise in treating septic cardiomyopathy by improving cardiac mitochondrial function and reducing harmful reactive oxygen species in heart cells.
Area of Science:
- Cardiology
- Mitochondrial Biology
- Pharmacology
Background:
- Septic cardiomyopathy, a common complication of septic shock, significantly increases mortality.
- Cardiac mitochondrial dysfunction is a key factor in septic cardiomyopathy, yet no specific treatments exist.
- Peroxisome proliferator-activated receptor (PPAR) coactivators (PGC-1α/β) regulate mitochondrial energy metabolism and reactive oxygen species (ROS) production in the heart.
Purpose of the Study:
- To investigate the therapeutic potential of a novel synthetic antimicrobial peptide, Pep2.5, in mitigating mitochondrial dysfunction in septic cardiomyopathy.
- To determine if Pep2.5 can restore the function of PPARs and PGC-1α/β in cardiomyocytes exposed to septic shock serum.
Main Methods:
- Murine cardiomyocytes were stimulated with serum from septic shock patients.
- The effects of Pep2.5 treatment on PPAR-α, PPAR-γ, PGC-1α/β expression were assessed.
- Mitochondrial respiration, cellular ATP levels, and ROS production were measured in treated and untreated cardiomyocytes.
Main Results:
- Pep2.5 treatment significantly attenuated the suppression of PPAR-α, PPAR-γ, and PGC-1α/β in cardiomyocytes exposed to septic shock serum.
- Pep2.5 administration enhanced mitochondrial maximum respiration and increased cellular ATP levels.
- Treatment with Pep2.5 markedly reduced the production of mitochondrial reactive oxygen species.
Conclusions:
- The synthetic peptide Pep2.5 demonstrates potential in ameliorating mitochondrial dysfunction associated with septic cardiomyopathy.
- Pep2.5 may represent a promising therapeutic strategy for septic cardiomyopathy by restoring mitochondrial health in the septic heart.
Related Concept Videos
01:14Myocarditis III: Medical Management
01:19Translocation of Proteins into the Mitochondria
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...