Purification and characterization of type AI arginase with immune inhibitory activity: Potential for the treatment of transplant rejection
作者
Soo-Ray Wang
卷期/出版年月
35卷2期 (2002/4)
頁次
59-66
摘要
A protein obtained from mammalian livers capable of inhibiting mitogen-induced lymphocyte proliferation, is called “liver-derived inhibitory protein”, or has been purified from mouse ;over homogenates and was proven to be arginase. Arginase in mammalian body has two isoforms, type I is liver orgin (i.e. LIP), type II exists in other tissues of the body. LIP can inhibit boyh Y- and B-lymphocytes. It is temperature stable up to 65℃ and PH stable from 3 to 11. LIP molecular weight is 105 kDa. The immune inhibitory property of liver arginase is due to arginine depletion resulting in suppression of syntheses of thymidine kinase and uridine kinase which have a half of only two hours; hence the DNA and RNA syntheses are inhibited and cell proliferation is suppressed. Liver arginase is the only mammalian amino acid-degradation enzyme that can potently inhibit lymphocyte proliferation. Because lymphocyte inhibition by liver arginase is reversible and is of non-cytotoxic, it is conceivable that liver arginase of human origin has a great potential of therapeutical benefit in treating transplant rejection.