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Kinetics of Thyroid Hormone Induced Changes in Liver and Skeletal Muscle Enzymes of Clarias batrachus

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Kinetics of Thyroid Hormone Induced Changes in Liver and Skeletal Muscle Enzymes of Clarias batrachus

G. Tripathi

Department of Zoology, J.N.V. University, Jodhpur-342001, India

Z. Naturforsch.54 c,458Ð461 (1999);

received December 28, 1998/March 1, 1999

Triiodothyronine, MDH, LDH, Liver, Skeletal Muscle Kinetics of triiodothyronine (T3) induced changes were studied in cytoplasmic malate dehydrogenase (cMDH), mitochondrial malate dehydrogenase (mMDH) and lactate dehydrogenase (LDH) 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 LDH were recorded around 19 hr after T3 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.

Reprint requests to G. Tripathi, 7B Ratan Sadan, Vijay Nagar, New Pali Road, Jodhpur-342001, India.

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