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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Cell+Physiol
2016 ; 311
(1
): C67-80
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The mitochondrial Ca2+ uniporter: regulation by auxiliary subunits and signal
transduction pathways
#MMPMID27122161
Jhun BS
; Mishra J
; Monaco S
; Fu D
; Jiang W
; Sheu SS
; O-Uchi J
Am J Physiol Cell Physiol
2016[Jul]; 311
(1
): C67-80
PMID27122161
show ga
Mitochondrial Ca(2+) homeostasis, the Ca(2+) influx-efflux balance, is
responsible for the control of numerous cellular functions, including energy
metabolism, generation of reactive oxygen species, spatiotemporal dynamics of
Ca(2+) signaling, and cell growth and death. Recent discovery of the molecular
identity of the mitochondrial Ca(2+) uniporter (MCU) provides new possibilities
for application of genetic approaches to study the mitochondrial Ca(2+) influx
mechanism in various cell types and tissues. In addition, the subsequent
discovery of various auxiliary subunits associated with MCU suggests that
mitochondrial Ca(2+) uptake is not solely regulated by a single protein (MCU),
but likely by a macromolecular protein complex, referred to as the MCU-protein
complex (mtCUC). Moreover, recent reports have shown the potential role of MCU
posttranslational modifications in the regulation of mitochondrial Ca(2+) uptake
through mtCUC. These observations indicate that mtCUCs form a local signaling
complex at the inner mitochondrial membrane that could significantly regulate
mitochondrial Ca(2+) handling, as well as numerous mitochondrial and cellular
functions. In this review we discuss the current literature on mitochondrial
Ca(2+) uptake mechanisms, with a particular focus on the structure and function
of mtCUC, as well as its regulation by signal transduction pathways, highlighting
current controversies and discrepancies.