Cardioprotection via preserved mitochondrial structure and function in the mPer2-mutant mouse myocardium
| Autor: | Robert M. Lust, Kathleen Thayne, Susan D. Kent, Tracy L. Johnson, Ethan J. Anderson, Harrison D. Blanton, Jonathan DeAntonio, Jitka A. I. Virag, Fatiha Moukdar, Jian Ding |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Pathology
medicine.medical_specialty Physiology Mutant Blotting Western Myocardial Infarction Apoptosis Myocardial Reperfusion Injury Biology medicine.disease_cause Mitochondria Heart chemistry.chemical_compound Mice Oxygen Consumption Physiology (medical) medicine Animals Myocytes Cardiac Circadian rhythm Cardioprotection Mutation Macrophages Period Circadian Proteins Immunohistochemistry Mice Mutant Strains Cell biology Adenosine Diphosphate Mice Inbred C57BL Adenosine diphosphate Disease Models Animal Oxidative Stress chemistry Neutrophil Infiltration Mitochondrial Membranes Call for Papers Female Cardiology and Cardiovascular Medicine Reactive Oxygen Species Oxidative stress Biomarkers |
| Popis: | We have previously shown that myocardial infarct size in nonreperfused hearts of mice with a functional deletion of the circadian rhythm gene mPer2 (mPer2-M) was reduced by 43%. We hypothesized that acute ischemia-reperfusion injury (I/R = 30 min I/2 h R) would also be reduced in these mice and that ischemic preconditioning (IPC) (3 × 5 min cycles) before I/R, which enhances protection in wild-type (WT) hearts, would provide further protection in mPer2-M hearts. We observed a 69 and 75% decrease in infarct size in mPer2-M mouse hearts compared with WT following I/R and IPC, respectively. This was coincident with 67% less neutrophil infiltration and 57% less apoptotic cardiomyocytes. IPC in mPer2-M mice before I/R had 48% less neutrophil density and 46% less apoptosis than their WT counterparts. Macrophage density was not different between WT and mPer2-M I/R, but it was 45% higher in mPer2-M IPC mouse hearts compared with WT IPC. There were no baseline differences in cardiac mitochondrial function between WT and mPer2-M mice, but, following I/R, WT exhibited a marked decrease in maximal O2 consumption supported by complex I-mediated substrates, whereas mPer2-M did not, despite no difference in complex I content. Moreover, cardiac mitochondria from WT mice exhibited a very robust increase in ADP-stimulated O2 consumption in response to exogenously added cytochrome c, along with a high rate of reactive oxygen species production, none of which was exhibited by cardiac mitochondria from mPer2-M following I/R. Taken together, these findings suggest that mPer2 deletion preserves mitochondrial membrane structure and functional integrity in heart following I/R injury, the consequence of which is preservation of myocardial viability. Understanding the mechanisms connecting cardiac events, mitochondrial function, and mPer2 could lead to preventative and therapeutic strategies for at risk populations. |
| Databáze: | OpenAIRE |
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