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SHR Neuro Krebs Kardio Lipid

Trenker, M; Malli, R; Fertschai, I; Levak-Frank, S; Graier, WF.
Uncoupling proteins 2 and 3 are fundamental for mitochondrial Ca2+ uniport.
Nat Cell Biol. 2007; 9(4): 445-452. [OPEN ACCESS]
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Autor/innen der Med Uni Graz:
Fertschai Ismene
Graier Wolfgang
Levak Sanja
Malli Roland
Trenker Michael

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Number of Figures: 4
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Mitochondrial Ca(2+) uptake is crucial for the regulation of the rate of oxidative phosphorylation, the modulation of spatio-temporal cytosolic Ca(2+) signals and apoptosis. Although the phenomenon of mitochondrial Ca(2+) sequestration, its characteristics and physiological consequences have been convincingly reported, the actual protein(s) involved in this process are unknown. Here, we show that the uncoupling proteins 2 and 3 (UCP2 and UCP3) are essential for mitochondrial Ca(2+) uptake. Using overexpression, knockdown (small interfering RNA) and mutagenesis experiments, we demonstrate that UCP2 and UCP3 are elementary for mitochondrial Ca(2+) sequestration in response to cell stimulation under physiological conditions - observations supported by isolated liver mitochondria of Ucp2(-/-) mice lacking ruthenium red-sensitive Ca(2+) uptake. Our results reveal a novel molecular function for UCP2 and UCP3, and may provide the molecular mechanism for their reported effects. Moreover, the identification of proteins fundemental for mitochondrial Ca(2+) uptake expands our knowledge of the physiological role for mitochondrial Ca(2+) sequestration.
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