Abstract
Studies on the role of mitochondrial fission/fusion (MFF) proteins in the heart have been initiated recently due to their biological significance in cell metabolism. We hypothesized that the expression of MFF proteins is affected by post-infarction remodeling and in vitro cardiomyocyte hypertrophy, and serves as a target for the Na+/H+ exchanger 1 (NHE-1) inhibition. Post-infarction remodeling was induced in Sprague–Dawley rats by coronary artery ligation (CAL) while in vitro hypertrophy was induced in cardiomyocytes by phenylephrine (PE). Mitochondrial fission (Fis1, DRP1) and fusion (Mfn2, OPA1) proteins were analyzed in heart homogenates and cell lysates by Western blotting. Our results showed that 12 and 18 weeks after CAL, Fis1 increased by 80% (P < 0.01) and 31% (P < 0.05), and Mfn2 was reduced by 17% (P < 0.05) and 22% (P < 0.05), respectively. OPA1 was not changed at 12 weeks, although its expression decreased by 18% (P < 0.05) with 18 weeks of ligation. MFF proteins were also affected by PE-induced hypertrophy that was dependent on mitochondrial permeability transition pore opening and oxidative stress. The NHE-1-specific inhibitor EMD-87580 (EMD) attenuated changes in the expression of MFF proteins in both the models of hypertrophy. The effect of EMD was likely mediated, at least in part, through its direct action on mitochondria since Percoll-purified mitochondria and mitoplasts have been shown to contain NHE-1. Our study provides the first evidence linking cardiac hypertrophy with MFF proteins expression that was affected by NHE-1 inhibition, thus suggesting that MFF proteins might be a target for pharmacotherapy with anti-hypertrophic drugs.
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Abbreviations
- ANP:
-
Atrial natriuretic peptide
- ANT:
-
Adenine nucleotide translocase
- CAL:
-
Coronary artery ligation
- COX:
-
Cytochrome c oxidase
- CyP-D:
-
Cyclophilin D
- DRP1:
-
Dynamin-related protein 1
- EMD:
-
EMD87580
- Fis1:
-
Mitochondrial fission 1 protein
- MCT-1:
-
Monocarboxylate cotransporter 1
- MFF:
-
Mitochondrial fission and fusion
- Mfn1 and Mfn2:
-
Mitofusins 1 and 2
- MPT:
-
Mitochondrial permeability transition
- NHE-1:
-
Na+/H+ exchanger 1
- OPA1:
-
Optic atrophy type 1 protein
- PE:
-
Phenylephrine
- RIR:
-
ROS-induced ROS
- ROS:
-
Reactive oxygen species
- RR:
-
Ruthenium red
- α-SA:
-
α-Skeletal actin
- SfA:
-
Sanglifehrin A
- SHR:
-
Spontaneously hypertensive rats
- VDAC:
-
Voltage dependent anion channel
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Acknowledgments
Dr. M. Karmazyn holds a Tier 1 Canada Research Chair in Experimental Cardiology. This study was supported by a grant from the Institute of Cardiovascular and Respiratory Health of the Canadian Institutes of Health Research to Dr. M. Karmazyn and in part, by the School of Medicine, University of Puerto Rico to Dr. S. Javadov. Dr. A. Kilić was supported by a Fellowship from the Heart and Stroke Foundation of Canada and the Tailored Advanced Collaborative Training in Cardiovascular Science (TACTICS) program.
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Javadov, S., Rajapurohitam, V., Kilić, A. et al. Expression of mitochondrial fusion–fission proteins during post-infarction remodeling: the effect of NHE-1 inhibition. Basic Res Cardiol 106, 99–109 (2011). https://doi.org/10.1007/s00395-010-0122-3
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DOI: https://doi.org/10.1007/s00395-010-0122-3