Seasonal fluctuations of pancreatic activities and cyclic nucleotide levels in the frog Rana esculenta |
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| Authors: | S Scapin |
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| Affiliation: | 1. Department of Neuroscience and Behavior, Ribeirão Preto Medical School, University of São Paulo, SP, Brazil;2. National Institute for Translational Medicine (INCT-TM), CNPq, Brazil;1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China;2. College of Geography and Environment, Shandong Normal University, Ji’nan 250358, PR China;3. Department of Ecology and Environmental Sciences, Umeå University, Umeå SE-901 87, Sweden;4. Department of Geography and Environmental Science, Hunter College of the City University of New York, NY 10021, USA;5. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, PR China;1. State Key Laboratory of Fine Chemicals, Research and Development Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Electronic & Computer Engineering, Hong Kong University of Science and Technology, 999077, Hong Kong, China;3. SINOPEC Dalian Research Institute of Petroleum and Petrochemicals, Dalian 116045, China;4. Panjin Institute of Industrial Technology, Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Dalian University of Technology, Panjin 124221, Liaoning, China;1. Innovative Drug Research Centre (IDRC), School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, China;2. Key Laboratory of Drug Targeting and Novel Delivery System of the Ministry of Education, West China School of Pharmacy, Sichuan University, Chengdu 610041, China |
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| Abstract: | 1. Seasonal influence on pancreatic activity has been determined in the frog Rana esculenta. 2. Protein content, amylase activity and cyclic nucleotide levels, show significant changes throughout the year, being higher in the active period (spring, summer), with respect to a constant pancreas weight. 3. A significant correlation between protein content and cyclic AMP levels has been observed. 4. Results suggest that feeding habits exert a control on the pancreatic activity even if stimuli other than food intake cannot be ruled out. |
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