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2016 ; 113
(13
): E1872-80
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Mitochondrial calcium uniporter regulator 1 (MCUR1) regulates the calcium
threshold for the mitochondrial permeability transition
#MMPMID26976564
Chaudhuri D
; Artiga DJ
; Abiria SA
; Clapham DE
Proc Natl Acad Sci U S A
2016[Mar]; 113
(13
): E1872-80
PMID26976564
show ga
During the mitochondrial permeability transition, a large channel in the inner
mitochondrial membrane opens, leading to the loss of multiple mitochondrial
solutes and cell death. Key triggers include excessive reactive oxygen species
and mitochondrial calcium overload, factors implicated in neuronal and cardiac
pathophysiology. Examining the differential behavior of mitochondrial Ca(2+)
overload in Drosophila versus human cells allowed us to identify a gene, MCUR1,
which, when expressed in Drosophila cells, conferred permeability transition
sensitive to electrophoretic Ca(2+) uptake. Conversely, inhibiting MCUR1 in
mammalian cells increased the Ca(2+) threshold for inducing permeability
transition. The effect was specific to the permeability transition induced by
Ca(2+), and such resistance to overload translated into improved cell survival.
Thus, MCUR1 expression regulates the Ca(2+) threshold required for permeability
transition.