Mitochondrial NHE1: a newly identified target to prevent heart disease

作者：Alvarez Bernardo V^*; Villa Abrille Maria C

来源：Frontiers in Physiology, 2013, 4: 152.

DOI：10.3389/fphys.2013.00152

• ischemia
• mitochondrial permeability transition pore
• NHE1
• mitochondrial swelling
• siRNA

Mitochondria' damage has been associated with early steps of cardiac dysfunction in heart subjected to ischemic stress, oxidative stress and hypertrophy. A common feature for the mitochondrial deterioration is the loss of the mitochondrial membrane potential (Delta psi m) with the concomitant irreversible opening of the mitochondrial permeability transition pore (MPTP) which follows the mitochondrial Ca2+ overload, and the subsequent mitochondrial swelling. We have recently characterized the expression of the Na+/H+ exchanger 1 (mNHE1) in mitochondrial membranes. This surprising observation provided a unique target for the prevention of the Ca2+-induced MPTP opening, based on the inhibition of the NHE1 m. In this line, inhibition of NHE1 m activity and/or reduction of NHE1 m expression decreased the Ca2+-induced mitochondrial swelling and the release of reactive oxygen species (ROS) in isolated cardiac mitochondria and preserved the Delta psi m in isolated cardiomyocytes. Mitochondrial NHE1 thus represents a novel target to prevent cardiac disease, opening new avenues for future research.

• 出版日期2013