El-Naggar, A. M.; Zaher, M. R.; El-Ghaffar, S. A., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1983, vol. 22, # 4, p. 392 - 395
Inhibition of nitric oxide synthesis by NG-nitro-L-arginine methyl ester (L-NAME): requirement for bioactivation to the free acid, NG-nitro-L-arginine
摘要:
The L‐arginine derivatives NG‐nitro‐L‐arginine (L‐NOARG) and NG‐nitro‐L‐arginine methyl ester (L‐NAME) have been widely used to inhibit constitutive NO synthase (NOS) in different biological systems. This work was carried out to investigate whether L‐NAME is a direct inhibitor of NOS or requires preceding hydrolytic bioactivation to L‐NOARG for inhibition of the enzyme.A bolus of L‐NAME and L‐NOARG (0.25 μmol) increased coronary perfusion pressure of rat isolated hearts to the same extent (21 ± 0.8 mmHg; n = 5), but the effect developed more rapidly following addition of L‐NOARG than L‐NAME (mean half‐time: 0.7 vs. 4.2 min). The time‐dependent onset of the inhibitory effect of L‐NAME was paralleled by the appearance of L‐NOARG in the coronary effluent.Freshly dissolved L‐NAME was a 50 fold less potent inhibitor of purified brain NOS (mean IC50 = 70 μm) than L‐NOARG (IC50 = 1.4 μm), but the apparent inhibitory potency of L‐NAME approached that of L‐NOARG upon prolonged incubation at neutral or alkaline pH. H.p.l.c. analyses revealed that NOS inhibition by L‐NAME closely correlated with hydrolysis of the drug to L‐NOARG.Freshly dissolved L‐NAME contained 2% of L‐NOARG and was hydrolyzed with a half‐life of 365 ± 11.2 min in buffer (pH 7.4), 207 ± 1.7 min in human plasma, and 29 ± 2.2 min in whole blood (n = 3 in each case). When L‐NAME was preincubated in plasma or buffer, inhibition of NOS was proportional to formation of L‐NOARG, but in blood the inhibition was much less than expected from the rates of L‐NAME hydrolysis. This was explained by accumulation of L‐NOARG in blood cells.These results suggest that L‐NAME represents a prodrug lacking NOS inhibitory activity unless it is hydrolyzed to L‐NOARG. Bioactivation of L‐NAME proceeds at moderate rates in physiological buffers, but is markedly accelerated in tissues such as blood or vascular endothelium.
[EN] INHIBITORS OF GROWTH FACTOR ACTIVATION ENZYMES<br/>[FR] INHIBITEURS D'ENZYMES D'ACTIVATION DE FACTEUR DE CROISSANCE
申请人:UNIV WASHINGTON
公开号:WO2016144654A1
公开(公告)日:2016-09-15
The present invention generally relates to compounds that are useful for inhibiting one or more of hepatocyte growth factor activator, matriptase, hepsin, Factor Xa, or thrombin. The present invention also relates to various methods of using the inhibitor compounds including treating a malignancy, a pre-malignant condition, or cancer by administering an effective amount of the inhibitor to a subject in need thereof.
1,3-Diarylprop-2-en-1-ones, compositions containing them and use thereof
申请人:AVENTIS PHARMA S.A.
公开号:US20030153611A1
公开(公告)日:2003-08-14
1,3-Diarylprop-2-en-1-ones and derivatives, compositions containing them, manufacturing process and use. Substituted 1,3-diarylprop-2-en-1-ones with therapeutic activity may be used in oncology.
1,3-DIARYLPROP-2-EN-1-ONES, COMPOSITIONS CONTAINING THEM AND USE THEREOF
申请人:Aventis Pharma S.A.
公开号:US20040147584A2
公开(公告)日:2004-07-29
Abstract of the Disclosure
1,3-Diarylprop-2-en-1-ones and derivatives, compositions containing them, manufacturing process and use. Substituted 1,3-diarylprop-2-en-1-ones with therapeutic activity may be used in oncology.
Polar Hydrophilic Prodrugs of Amphetamine and Other Stimulants and Processes for Making and Using the Same
申请人:Mickle Travis C.
公开号:US20080207757A1
公开(公告)日:2008-08-28
Disclosed are polar, hydrophilic stimulant prodrug compositions comprising at least one stimulant chemically attached to a polar hydrophilic ligand, a salt thereof, a derivative thereof, or a combination thereof. Methods of making and using the same are also disclosed.
Unique salts of trimebutine and N-monodesmethyl trimebutine, and their corresponding stereoisomers, having improved analgesic properties useful in the treatment of visceral pain are provided. The salts of the present invention are particularly useful in the treatment of conditions characterized by abdominal pain, such as inflammatory bowel disease (IBD) and irritable bowel syndrome (IBS), diabetic gastroparesis, and dyspepsia.