Biochemical compartmentation of fish tissues. Distribution of gluconeogenic enzymes in the brain.
1. Specific glucose-6-phosphatase and fructose-1,6-diphosphatase activity were found to be biochemically compartmentalized in four parts of the brain in nine nutritionally important fishes. 2. Glucose-6-phosphatase and fructose-1,6-diphosphatase activity were highest in the cerebrum and lowest in the cerebellum. 3. Piscivorous fishes had the highest gluconeogenic enzyme content, followed by catfishes and major carps. 4. After the liver and muscles, the various parts of the brain play an important role in carbohydrate metabolism. 5. A direct relationship between the stage of evolution and elevation of gluconeogenic enzyme levels was observed. 6. It is evident from the results and the discussion that evolution modifies the biochemical organization of fishes in general and of their brain in particular.
D000818:Animals; D001921:Brain / Q000201:enzymology*; D002531:Cerebellum / Q000201:enzymology; D005399:Fishes / Q000378:metabolism*; D006597:Fructose-Bisphosphatase / Q000378:metabolism; D005952:Glucose-6-Phosphatase / Q000378:metabolism; D007031:Hypothalamus / Q000201:enzymology; D008526:Medulla Oblongata / Q000201:enzymology; D013788:Thalamus / Q000201:enzymology
D006597:Fructose-Bisphosphatase; D005952:Glucose-6-Phosphatase