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1999 (2)
1Author    G. TripathiRequires cookie*
 Title    Kinetics of Thyroid Hormone Induced Changes in Liver and Skeletal Muscle Enzymes of Clarias batrachus  
 Abstract    Kinetics of triiodothyronine (T 3) induced changes were studied in cytoplasmic malate dehydrogenase (cM DH), mitochondrial malate dehydrogenase (mMDH) and lactate dehydrogenase (LD H) of the liver and skeletal muscle of a catfish, Clarias batrachus. The rates of gradual inductions in the activities of all the three metabolic enzymes were faster in skeletal muscle than those of the liver. These time-dependent and tissue-specific inductions may be due to the possible differ­ ences in the rates of different enzymic syntheses. The maximum inductions in the activities of cMDH, mMDH and LD H were recorded around 19 hr after T 3 treat­ ment. Thereafter, the activities of all the enzymes grad­ ually declined to their half levels within the next 12 hr which reflected the physiological half-life of these meta­ bolic enzymes in the freshwater catfish. 
  Reference    Z. Naturforsch. 54c, 458 (1999); received December 28 1998/March 1 1999 
  Published    1999 
  Keywords    Triiodothyronine, MDH, LDH, Liver, Skeletal Muscle 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0458_n.pdf 
 Identifier    ZNC-1999-54c-0458_n 
 Volume    54 
2Author    Ghanashyam TripathiRequires cookie*
 Title    Scaling of Some Metabolic Enzymes in Liver of a Freshwater Teleost: An Adaptive Mechanism  
 Abstract    The activities of mitochondrial malate dehydrogenase (m M DH) and the total mito­ chondrial proteins increase as a function of body mass in the freshwater catfish, Clarias batrachus. It clearly indicates an increase in energy production in larger-sized individuals for various purposes including prey-predator interactions. The higher activity of lactate dehydro­ genase (LDH) in larger fish may indicate more production of lactate for gluconeogenesis in the liver to meet emergency requirements of increased energy demand. However, the activity of cytoplasmic malate dehydrogenase (cMDH) decreases with the increasing body mass of the fish which reflects reduction in N ADPH production and, in turn, reduced lipogenesis in liver of larger individuals. Thus, the present observations suggest an adaptive mechanism dealing with the higher energy budget, and reduced synthetic activities (lipogenesis) in the liver of larger-sized freshwater catfish. This type of biochemical scaling might be also support­ ing other metabolic pathways in order to adjust some physiological functions for survival in the aquatic environment. 
  Reference    Z. Naturforsch. 54c, 1103—1106 (1999); received July 12/September 1 1999 
  Published    1999 
  Keywords    Teleost, Liver, Scaling, Lactate Dehydrogenase, Malate Dehydrogenase 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-1103.pdf 
 Identifier    ZNC-1999-54c-1103 
 Volume    54