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.
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Abbreviations
- ADP:
-
Adenosine-5′-diphosphate
- ATP:
-
Adenosine-5′-triphosphate
- BSA:
-
Bovine serum albumin
- CCO:
-
Cytochrome c oxidase
- CCOc :
-
Cytochrome c oxidase in the presence of additional cytochrome c
- EGTA:
-
Ethylene glycol tetraacetic acid
- ETS:
-
Electron transport system
- FADH2 :
-
Flavin adenine dinucleotide (reduced)
- FCCP:
-
Carbonyl cyanide p-(trifluoro-methoxy) phenyl-hydrazone
- HEPES:
-
Na N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid
- JO 2 :
-
Rate of mitochondrial oxygen consumption
- LSLR:
-
Least squares linear regression
- MES:
-
2-(N-morpholino) ethanesulfonic acid
- NADH:
-
Nicotinamide adenine dinucleotide (reduced)
- OXPHOS:
-
Oxidative phosphorylation
- RCR:
-
Respiratory control ratio
- ROS:
-
Reactive oxygen species
- TMPD:
-
N,N,N′,N′-tetramethyl-p-phenyldiamine
- VO 2 :
-
Rate of oxygen consumption
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Acknowledgments
We are very grateful to Ms K Ruggiero for advice with statistical analyses, Brady Doak and Murray Birch as skippers of the R.V. Hawere, Ryan Chai for assistance in the laboratory, and three anonymous reviewers for comments that greatly improved the manuscript. This work was supported by a Royal Society of New Zealand Marsden Fund grant (UOA218) to KDC. All experiments and procedures met with the ethical requirements of the University of Auckland, New Zealand (NZ) (Approval AEC/03/2006/R456) and with the current laws of NZ.
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Communicated by I.D. Hume.
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Hilton, Z., Clements, K.D. & Hickey, A.J.R. Temperature sensitivity of cardiac mitochondria in intertidal and subtidal triplefin fishes. J Comp Physiol B 180, 979–990 (2010). https://doi.org/10.1007/s00360-010-0477-7
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DOI: https://doi.org/10.1007/s00360-010-0477-7