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N-ethylmaleimide inhibits xanthine oxidase activity with no detectable change in xanthine dehydrogenase activity in rabbit liver

机译:N-乙基马来酰亚胺抑制黄嘌呤氧化酶活性,而兔子肝脏中的黄嘌呤脱氢酶活性未检测到变化

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摘要

The effect of an alkylating agent, N-ethylmaleimide (NEM), on the activities of xanthine oxidase (XO) and xanthine dehydrogenase (XD) in the presence and absence of Cu2+ or trypsin in the cytosolic fraction from rabbit liver was examined. At concentrations ranging from 0.25 to 2.0 muM, allopurinol, which is generally considered to be a XO inhibitor, suppressed the XD activity (41.5-93.4% inhibition) in addition to the XO activity (28.6-88.4% inhibition) under basal conditions, without the addition of CU2+ or trypsin. In contrast, NEM (100-400 muM) inhibited the XO activity (35.7-85.7% inhibition) without affecting the XD activity. Also, NEM inhibited the CU2+- and trypsin-induced XO activities, but did not affect the XD activity at the same concentration range. These results demonstrate that NEM can be a selective inhibitor of XO activity in rabbit liver. (C) 2000 Elsevier Science Inc. All rights reserved. [References: 36]
机译:研究了在有和没有Cu2 +或胰蛋白酶的兔肝胞质组分中,烷基化剂N-乙基马来酰亚胺(NEM)对黄嘌呤氧化酶(XO)和黄嘌呤脱氢酶(XD)活性的影响。在0.25至2.0μM的浓度范围内,通常被认为是XO抑制剂的别嘌醇在基础条件下除XO活性(抑制28.6-88.4%)外,还抑制XD活性(抑制41.5-93.4%)。添加CU2 +或胰蛋白酶。相反,NEM(100-400μM)抑制了XO活性(抑制了35.7-85.7%),而没有影响XD活性。同样,NEM抑制CU2 +和胰蛋白酶诱导的XO活性,但在相同浓度范围内不影响XD活性。这些结果证明,NEM可以是兔肝XO活性的选择性抑制剂。 (C)2000 Elsevier Science Inc.保留所有权利。 [参考:36]

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