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. 2007 Sep;14(9):1647-56.
doi: 10.1038/sj.cdd.4402167. Epub 2007 Jun 1.

Mdm38 Protein Depletion Causes Loss of Mitochondrial K+/H+ Exchange Activity, Osmotic Swelling and Mitophagy

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Mdm38 Protein Depletion Causes Loss of Mitochondrial K+/H+ Exchange Activity, Osmotic Swelling and Mitophagy

K Nowikovsky et al. Cell Death Differ. .
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Abstract

Loss of the MDM38 gene product in yeast mitochondria results in a variety of phenotypic effects including reduced content of respiratory chain complexes, altered mitochondrial morphology and loss of mitochondrial K(+)/H(+) exchange activity resulting in osmotic swelling. By use of doxycycline-regulated shut-off of MDM38 gene expression, we show here that loss of K(+)/H(+) exchange activity and mitochondrial swelling are early events, associated with a reduction in membrane potential and fragmentation of the mitochondrial reticulum. Changes in the pattern of mitochondrially encoded proteins are likely to be secondary to the loss of K(+)/H(+) exchange activity. The use of a novel fluorescent biosensor directed to the mitochondrial matrix revealed that the loss of K(+)/H(+) exchange activity was immediately followed by morphological changes of mitochondria and vacuoles, the close association of these organelles and finally uptake of mitochondrial material by vacuoles. Nigericin, a K(+)/H(+) ionophore, fully prevented these effects of Mdm38p depletion. We conclude that osmotic swelling of mitochondria triggers selective mitochondrial autophagy or mitophagy.

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