The use of liver extract in dermatology.
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The incorporation of labeled precursors into DNA, RNA and protein in phytohaemagglutinin (PHA)-prestimulated human lymphocytes was maximally inhibited by liver extract (LEx) or arginase at 24 h. The activities of DNA polymerase alpha, beta and gamma were less inhibitable by these agents than was [3H]thymidine incorporation. The inhibition of DNA, RNA and protein syntheses by either LEx or arginase is probably due to arginine depletion by arginase activity, since their syntheses were similarly inhibited when cultured in an arginine-free medium in the absence of arginase. These results indicate that arginase nonspecifically inhibits the activities of DNA polymerase. The inhibition is probably due to arginine depletion.