Effect of long-term thermal challenge on the Antarctic notothenioid Notothenia rossii

Autor: Claudio Adriano Piechnik, Luís Fernando Fávaro, Maria Rosa Dmengeon Pedreiro de Souza, Cintia Machado, Mariana Forgati, Flávia Baduy, Tania Zaleski, Priscila Krebsbach Kandalski, Danilo Santos Eugênio, Lucélia Donatti
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Male
Physiology
Acclimatization
Biochemistry
Notothenia rossii
chemistry.chemical_compound
Malate Dehydrogenase
African catfish
Citrate synthase
Glutathione Transferase
0303 health sciences
biology
Muscles
Temperature
04 agricultural and veterinary sciences
General Medicine
Catalase
Liver
Female
Anaerobic exercise
Glycogen
Fish Proteins
medicine.medical_specialty
Elevated-temperature
Antarctic Regions
Aquatic Science
Superoxide dismutase
Biochemical parameters
03 medical and health sciences
Goldfish tissues
Albumins
Internal medicine
Lactate dehydrogenase
medicine
Animals
Climate-change
030304 developmental biology
L-Lactate Dehydrogenase
Triglyceride
Superoxide Dismutase
Cold adaptation
Lipid Metabolism
biology.organism_classification
Perciformes
Glucose
Endocrinology
chemistry
Gluconeogenesis
Antioxidant defense system
Oxidative stress
040102 fisheries
biology.protein
0401 agriculture
forestry
and fisheries
Clarias-gariepinus
Energy Metabolism
Temperature-acclimation
Zdroj: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Popis: The thermal stability of the Antarctic Ocean raises questions concerning the metabolic plasticity of Antarctic notothenioids to changes in the environmental temperature. In this study, Notothenia rossii survived 90 days at 8 degrees C, and their condition factor level was maintained. However, their hepatosomatic (0.29x) index decreased, indicating a decrease in nutrient storage as a result of changes in the energy demands to support survival. At 8 degrees C, the plasma calcium, magnesium, cholesterol, and triglyceride concentrations decreased, whereas the glucose (1.91x) and albumin (1.26x) concentrations increased. The main energy substrate of the fish changed from lipids to glucose due to a marked increase in lactate dehydrogenase activity, as demonstrated by an increase in anaerobic metabolism. Moreover, malate dehydrogenase activity increased in all tissues, suggesting that fish acclimated at 8 degrees C exhibit enhanced gluconeogenesis. The aerobic demand increased only in the liver due to an increase (2.23x) in citrate synthase activity. Decreases in the activities of superoxide dismutase, catalase, and glutathione-Stransferase to levels that are most likely sufficient at 8 degrees C were observed, establishing a new physiological activity range for antioxidant defense. Our findings indicate that N. rossii has some compensatory mechanisms that enabled its long-term survival at 8 degrees C. CAPESCAPES CNPqNational Council for Scientific and Technological Development (CNPq) FAPERJ through projects PNPD (CAPES) [2443/2011] EBA (MCTI/CNPq) [52.0125/2008-8] INCT-APA (CNPq)National Council for Scientific and Technological Development (CNPq) [574018/2008-5, FAPERJ E-26/170.023/2008] EBA (CNPq)National Council for Scientific and Technological Development (CNPq) [305562/2009-6, 305969/2012-9]
Databáze: OpenAIRE
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