Title : Worms from the Arctic are better adapted to freezing and high salinity than worms from temperate regions: Oxidative stress responses in Enchytraeus albidus - Silva_2013_Comp.Biochem.Physiol.A.Mol.Integr.Physiol_166_582 |
Author(s) : Silva AL , Holmstrup M , Amorim MJ |
Ref : Comparative Biochemistry & Physiology A Comparative Physiology Mol Integr Physiol , 166 :582 , 2013 |
Abstract :
Enchytraeus albidus is a freeze-tolerant enchytraeid found in diverse habitats, from supra-littoral to terrestrial, and spanning temperate to arctic regions. Thus, this worm is often exposed to sub-zero temperatures and fluctuating salinity regimes that can lead to physiological stress. We therefore studied the oxidative stress by measuring lipid peroxidation, anti-oxidant defenses and neurotransmission activity in E. albidus from arctic (Greenland) and temperate (Germany) regions during a short-term exposure to saline conditions (0, 15, 35 and 50 per thousand NaCl) and low temperatures (+2, -2 and -5 degrees C). Various enzymatic and non-enzymatic oxidative stress markers were analyzed. Results have shown that both salt and freezing caused oxidative stress in E. albidus, particularly from Germany, as confirmed by catalase, glutathione-S-transferase and superoxide dismutase activities and lipid peroxidation levels. Neurotransmission (as judged from acetylcholinesterase activity) was reduced by saline conditions at +2 degrees C, but stimulated at -2 and -5 degrees C. Worms from Greenland had relatively higher and more stable levels of antioxidants than worms from Germany, reflecting their higher tolerance of freezing and saline conditions. |
PubMedSearch : Silva_2013_Comp.Biochem.Physiol.A.Mol.Integr.Physiol_166_582 |
PubMedID: 24029732 |
Silva AL, Holmstrup M, Amorim MJ (2013)
Worms from the Arctic are better adapted to freezing and high salinity than worms from temperate regions: Oxidative stress responses in Enchytraeus albidus
Comparative Biochemistry & Physiology A Comparative Physiology Mol Integr Physiol
166 :582
Silva AL, Holmstrup M, Amorim MJ (2013)
Comparative Biochemistry & Physiology A Comparative Physiology Mol Integr Physiol
166 :582