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Pichaud 2013 J Bioenerg Biomembr

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Publications in the MiPMap
Pichaud N, Ballard JWO, Tanguay RM, Blier PU (2013) Mitochondrial haplotype divergences affect specific temperature sensitivity of mitochondrial respiration. J Bioenerg Biomembr 45:25-35.

» PMID: 23054075

Pichaud N, Ballard JWO, Tanguay RM, Blier PU (2013) J Bioenerg Biomembr

Abstract: The aim of this study was to investigate the effect of temperature changes on the functional properties of mitochondria from two sets of D. simulans fly lines harboring the siII and siIII haplotypes in a common nuclear genetic background. We studied four introgressed isofemale lines possessing the mtDNA of siII and the nuclear background of siIII (siII-introgressed) and four lines possessing siIII mitochondria with its native nuclear genome (siIII-controls). We assessed the catalytic capacities of electron transport system (ET-pathway) at four different temperatures (12, 18, 24 and 28 ºC). The impact of temperature on the pyruvate dehydrogenase (PDH) activity, the mitochondrial respiration (coupled and uncoupled respiration), cytochrome c oxidase activity, as well as the excess capacity of complex IV (COX) were evaluated in these two sets of flies. Our results showed that the temperature coefficient values (Q(10)) measured for mitochondrial respiration in the lower range of temperatures (12 to 18 ºC) showed a 2 to 3 fold increase in siII-introgressed when compared to siIII-controls. This result shows that the impact of temperature on mitochondrial function is different between the two mitotypes studied. The Q(10) results seem to be linked to the apparent COX excess capacity of 193% for siIII-controls that is inexistent for siII-introgressed at 12 ºC. One explanation for these results is that the mitochondria can compensate for the disruption of mito-nuclear interactions at 24 ºC but not at lower temperatures. An alternate explanation would be that siII haplotype confer divergent kinetic properties to the ET-pathway that translate to different temperature sensitivities Keywords: Mitochondrial DNA . Introgression . Electron transport system . Temperature

O2k-Network Lab: CA Rimouski Blier PU, AU Sydney Ballard JW, CA Moncton Pichaud N

Labels: MiParea: Respiration 

Organism: Hexapods  Tissue;cell: Skeletal muscle  Preparation: Permeabilized tissue 

Regulation: Temperature  Coupling state: LEAK, OXPHOS, ET  Pathway: N, NS, ROX  HRR: Oxygraph-2k