Difference between revisions of "Hilton 2010 J Comp Physiol B"
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|instruments=Oxygraph-2k | |instruments=Oxygraph-2k | ||
|organism=Fish | |organism=Fish | ||
|tissues= | |tissues=Heart | ||
|preparations=Intact Organism, Permeabilized tissue | |preparations=Intact Organism, Permeabilized tissue | ||
|couplingstates=OXPHOS | |couplingstates=OXPHOS | ||
|kinetics=Reduced Substrate; Cytochrome c, Temperature | |kinetics=Reduced Substrate; Cytochrome c, Temperature | ||
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Revision as of 11:36, 27 February 2013
| Hilton Z, Clements KD, Hickey AJ (2010) Temperature sensitivity of cardiac mitochondria in intertidal and subtidal triplefin fishes. J Comp Physiol B 180: 979-990. |
Hilton Z, Clements KD, Hickey AJ (2010) J Comp Physiol B
Abstract: The heart is acutely sensitive to temperature in aquatic ectotherms and appears to fail before any other organ as the thermal maximum is reached, although the exact cause of this failure remains unknown. The heart is highly aerobic and therefore dependent on mitochondrial oxidative phosphorylation (OXPHOS) to meet energy requirements, but the role of cardiac mitochondria in limiting heart function at high temperatures remains unclear. We used permeabilised ventricle fibres to explore heart mitochondrial function in situ in three closely related species of small New Zealand triplefin fishes in response to temperature. We compared this to measures of whole animal respiration rates and critical oxygen tensions in these fishes. Bellapiscis medius, an intertidal species, had the greatest tolerance to hypoxia at higher temperatures and had more efficient OXPHOS at 30 °C than the two subtidal species Forsterygion varium and F. malcolmi. B. medius also displayed the highest cytochrome c oxidase flux, which may in part explain how B. medius tolerates higher temperatures and hypoxia. Triplefin heart mitochondria exhibit decreased coupling to phosphorylation with increasing temperature. This most likely impairs ATP supply to the heart at elevated temperatures, potentially contributing to heart failure at ecologically relevant temperatures. • Keywords: subtidal triplefin fishes, Bellapiscis medius, Forsterygion varium, Forsterygion malcolmi
• O2k-Network Lab: NZ Auckland Hickey AJ
Labels:
Organism: Fish"Fish" is not in the list (Human, Pig, Mouse, Rat, Guinea pig, Bovines, Horse, Dog, Rabbit, Cat, ...) of allowed values for the "Mammal and model" property.
Tissue;cell: Heart
Preparation: Intact Organism"Intact Organism" is not in the list (Intact organism, Intact organ, Permeabilized cells, Permeabilized tissue, Homogenate, Isolated mitochondria, SMP, Chloroplasts, Enzyme, Oxidase;biochemical oxidation, ...) of allowed values for the "Preparation" property., Permeabilized tissue
Coupling state: OXPHOS
HRR: Oxygraph-2k
