Journal
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMS AND ENVIRONMENTAL PHYSIOLOGY
Volume 187, Issue 8, Pages 1137-1154Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00360-017-1088-3
Keywords
Notothenia; Energy metabolism; Oxidative stress; Temperature; Admiralty Bay
Categories
Funding
- Brazilian Ministry of the Environment (MMA)
- Ministry of Science, Technology, and Innovation (MCTI)
- National Council for the Development of Scientific and Technological Research (CNPq)
- Brazilian Federal Agency for Support and Evaluation of Graduate Education (CAPES)
- Secretariat of the Inter-Ministerial Commission for the Resources of the Sea (SeCIRM)
- CAPES
- CNPq [CAPES/PNPD 2443/2011, CNPq 52.0125/2008-8, 30.5562/2009-6, 30.5969/2012-9]
- INCT-APA [CNPq 574.018/2008-5, FAPERJ E-26/170.023/2008]
Ask authors/readers for more resources
The objective of the present study was to assess the effect of short-term (2-144 h) heat stress (8 A degrees C) on energy production processes and antioxidant defense systems in the kidneys and gills of Notothenia rossii and Notothenia coriiceps. Heat stress affected energy metabolism and oxidative stress parameters in a time-, tissue-, and species-dependent manner, and gills were more sensitive than kidneys to heat stress. N. rossii kidneys were able to stabilize carbohydrate metabolism after 12 h of heat stress, whereas the glycogen levels in N. coriiceps kidneys fluctuated in response to varying glucose-6-phosphatase (G6Pase) levels. The gills of N. rossii were able to stabilize their energy demand and aerobic metabolism under heat stress, whereas in the gills of N. coriiceps, changes in carbohydrate metabolic pathways depended on the exposure time: initially, anaerobiosis was activated after 6 h; the energy demand, characterized by glycogen consumption, increased after 72 h, and aerobic metabolism was activated within 144 h. With regard to the antioxidant defenses of the N. rossii kidney, it was found that levels of antioxidant enzymes were reduced during the first hours of heat stress, contributing to increased lipid peroxidation, whereas N. coriiceps kidneys did not show signs of oxidative damage. The gills of N. rossii exhibited more pronounced oxidative damage in response to heat stress than those of N. coriiceps despite the presence of increasing levels of antioxidants, likely due to tissue hypoxia.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available