Journal
BIOLOGICAL & PHARMACEUTICAL BULLETIN
Volume 43, Issue 12, Pages 1993-1996Publisher
PHARMACEUTICAL SOC JAPAN
DOI: 10.1248/bpb.b20-00747
Keywords
mitochondria; Ca2+ uniporter; Na+-Ca2+ exchanger; Ca2+ imaging; KB-R7943; cardiomyocyte
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Funding
- JSPS KAKENHI [JP20K07299, JP20K16013, JP20K07091]
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The effect of KB-R7943, an inhibitor of the plasmalemmal Na+-Ca2+ exchanger, on mitochondrial Ca2+ transporters was examined with membrane-permeabilized cardiomyocyte-derived H9c2 cells expressing the fluorescent Ca2+ indicator, yellow cameleon 3.1, in the mitochondria. KB-R7943, as well as ruthenium red, inhibited the rise in mitochondrial Ca2+ on increasing the extramitochondrial Ca2+ concentration from 0 nM to 300 nM. CGP-37157, but not KB-R7943, inhibited the decline in mitochondrial Ca2+ on return to Ca2+ free extramitochondrial solution. These results indicated that KB-R7943 has inhibitory effects on the mitochondrial Ca2+ uniporter, but not on the mitochon-drial Na+-Ca2+ exchanger.
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