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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Selective effects of two chloromethyl ketones on amino acid and phosphate uptake in rat liver and tumors.

Injection of L-1-tosylamido-2-phenylethyl chloromethyl ketone (TPCK) at a level of 10 mg/100 g body weight inhibited the incorporation of 3H-labeled amino acids into protein in Morris hepatomas 7777and 9618A2. The degree of inhibition was similar in cytoplasmic proteins and in histone and nonhistone nuclear protein fractions. There was no inhibitory effect on 3H-labeled amino acid incorporation in the livers of the tumor-bearing rats. The inhibitory effect of N-tosyl-L-lysine chloromethyl ketone (TLCK) on incorporation of 3H-labeled amino acids was observed in both the slowly growing hepatoma 7787 and the rapidly growing hepatoma 7777. In hepatoma 7777, TLCK (2.5 mg/100 g body wt) exerted a greater inhibitory effect on incorporation when administered 60 minutes before [3H]leucine injection than when injected simultaneously. Studies on tissue uptake of amino acids, thymidine, and phosphate indicated that inhibitory effects of TPCK and TLCK on active transport may be a major factor in the action of these drugs on macromolecular synthesis. The inhibitory effects of TPCK and TLCK seen in transplanted hepatomas and a colon tumor were not generally seen in normal tissues of the tumor-bearing rats.[1]


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