High anoxia tolerance in the subterranean salamander Proteus anguinus without oxidative stress nor activation of antioxidant defenses during reoxygenation
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Publication Date
January 2009
Abstract
The present study describes a high anoxia tolerance in an amphibian at high temperature. Indeed, the subterranean salamander Proteus anguinus survived 12 h under anoxia at 12°C. Surprisingly, such experimental conditions did not affect P. anguinus oxidative status while muscles and liver antioxidant enzymes activities decreased under 8 h anoxia and only return to basal level during reoxygenation. To test if such adaptation is common in Urodels, equivalent experimentations have been conducted on another newt: the stream-dwelling Calotriton asper. This latter species exhibited only 1.5 h survival under anoxia in spite of higher antioxidant enzymes activities than P. anguinus. Furthermore, aerobic recovery after 1 h anoxia induced a 30% increase of oxidative damage partly explained by SOD and CAT activities that did not return to control values during reoxygenation, demonstrating a lower capacity to counteract ROS overproduction than P. anguinus. In addition, uncoupling protein (UCP) transcript was for the first time detected, partly sequenced and quantified in amphibian muscles and liver. UCP may be considered as a ROS production attenuator by mediating a discharge of the proton gradient generated by the respiratory chain. The putative role of UCP in post-anoxic oxidative status of both species is discussed.
Keywords
Amphibian, Reactive Oxygen Species, Anoxia/Reoxygenation, Antioxidant Enzymes, Uncoupling Protein
Document Type
Article
Notes
Journal of Comparative Physiology B, Vol. 179 (2009-01-16).
Identifier
SFS0072935_00001
Recommended Citation
Issartel, Julien; Hervant, Frédéric; and de Fraipont, Michelle, "High anoxia tolerance in the subterranean salamander Proteus anguinus without oxidative stress nor activation of antioxidant defenses during reoxygenation" (2009). KIP Articles. 2556.
https://digitalcommons.usf.edu/kip_articles/2556