Pharmacological characterization of guanidinoethyldisulphide (GED), a novel inhibitor of nitric oxide synthase with selectivity towards the inducible isoform
作者:Csaba Szabó、Ruslana Bryk、Basilia Zingarelli、Garry J. Southan、Timothy C. Gahman、Venkat Bhat、Andrew L. Salzman、Donald J. Wolff
DOI:10.1111/j.1476-5381.1996.tb15589.x
日期:1996.8
potency of GED on ecNOS in the ring preparations is considerably lower than its potency against iNOS in the cultured cells. These data suggest that the selectivity of GED towards iNOS may lie, in part, at the enzyme level, as well as differential uptake by cells expressing the various isoforms of NOS. 5. In a rat model of endotoxin shock in vivo, administration of GED, at 3 mg kg-1 bolus followed by 10 mg
1.胍,am,S-烷基异硫脲和近来巯基烷基胍已被描述为通过NO合酶(NOS)从L-精氨酸生成一氧化氮(NO)的抑制剂。我们最近证明了由巯基乙基胍(MEG)的二聚化形成的胍基乙基二硫化物(GED)是一氧化氮合酶的新型抑制剂。在这里,我们描述了GED在纯化的NOS亚型,各种培养的细胞类型,血管环制剂以及内毒素休克中的药理特性。2. GED有效抑制纯化的诱导型NOS(iNOS),内皮型NOS(ecNOS)和脑型NOS(bNOS)酶的NOS活性,Ki值分别为4.3、18和25 microM。因此,在酶水平上,GED对iNOS的选择性是ecNOS的4倍。GED对ecNOS和iNOS的抑制作用是竞争性的。L-精氨酸和非竞争性四氢生物蝶呤。3.用促炎细胞因子或细菌脂多糖的适当混合物刺激小鼠J774巨噬细胞,大鼠主动脉平滑肌细胞,鼠肺上皮细胞和人肠DLD-1细胞,以表达iNOS。在这些细胞中,GED有效抑