Abstract
Chloramphenicol a potent inhibitor of bacterial and some mammalian cell protein synthesis, was administered i.p. to a group of mice for 6 consecutive days. Another group of animals was treated similarly with thiamphenicol and a third group served as control. The effects of the two antibiotics on the activity of some liver enzymes; the two pyridoxal 5-phosphate dependent enzymes, kynurenine hydrolase and kynurenine amino-transferase; pyridoxal phosphokinase; β-glucuronidase and acid ribonuclease were determined. Chloramphenicol and thiamphenicol decreased significantly the activities of kynurenine hydrolase, β-glucuronidase and acid ribonuclease and both drugs increased the activity of pyridoxal phosphokinase significantly. Their effect on kynurenine amino-transferase was different, Chloramphenicol decreased while thiamphenicol increased the enzyme activity. Results are discussed and possible explanations suggested.
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