Small Molecular, Macromolecular, and Cellular Chloramines React with Thiocyanate To Give the Human Defense Factor Hypothiocyanite
摘要:
Thiocyanate reacts noncatalytically with myeloperoxidase-derived HOCl to produce hypothiocyanite (OSCN-), thereby potentially limiting the propensity of HOCl to inflict host issue damage that can lead to inflammatory disease. However, the efficiency with which SCN- captures HOCl in vivo depends on the concentration of SCN- relative to other chemical targets. In blood plasma, where the concentration of SCN- is relatively low, proteins may be the principal initial targets of HOCl, and chloramines are a significant product. Chloramines eventually decompose to irreversibly damage proteins. In the present study, we demonstrate that SCN- reacts efficiently with chloramines in small molecules, in proteins, and in Escherichia coli cells to give OSCN- and the parent amine. Remarkably, OSCN- reacts faster than SCN- with chloramines. These reactions of SCN- and OSCN- with chloramines may repair some of the damage that is inflicted on protein amines by HOCl. Our observations are further evidence for the importance of secondary reactions during the redox cascades that are associated with oxidative stress by hypohalous acids.
Design and Synthesis of New Transient Receptor Potential Vanilloid Type-1 (TRPV1) Channel Modulators: Identification, Molecular Modeling Analysis, and Pharmacological Characterization of the <i>N</i>-(4-Hydroxy-3-methoxybenzyl)-4-(thiophen-2-yl)butanamide, a Small Molecule Endowed with Agonist TRPV1 Activity and Protective Effects against Oxidative Stress
cyclic substitute of the unsaturated alkyl chain of the natural ligand, capsaicin. Accordingly, a new class of amides was synthesized in good yield and high purity and their molecular recognition against the target was investigated by means of docking experiments followed by molecular dynamics simulations, in order to rationalize their geometrical and thermodynamic profiles. The pharmacological properties
Synthesis of 3,6-disulfonated 4-aminonaphthalimides
作者:Walter W. Stewart
DOI:10.1021/ja00415a033
日期:1981.12
Small Molecular, Macromolecular, and Cellular Chloramines React with Thiocyanate To Give the Human Defense Factor Hypothiocyanite
作者:Bheki A. Xulu、Michael T. Ashby
DOI:10.1021/bi902089w
日期:2010.3.9
Thiocyanate reacts noncatalytically with myeloperoxidase-derived HOCl to produce hypothiocyanite (OSCN-), thereby potentially limiting the propensity of HOCl to inflict host issue damage that can lead to inflammatory disease. However, the efficiency with which SCN- captures HOCl in vivo depends on the concentration of SCN- relative to other chemical targets. In blood plasma, where the concentration of SCN- is relatively low, proteins may be the principal initial targets of HOCl, and chloramines are a significant product. Chloramines eventually decompose to irreversibly damage proteins. In the present study, we demonstrate that SCN- reacts efficiently with chloramines in small molecules, in proteins, and in Escherichia coli cells to give OSCN- and the parent amine. Remarkably, OSCN- reacts faster than SCN- with chloramines. These reactions of SCN- and OSCN- with chloramines may repair some of the damage that is inflicted on protein amines by HOCl. Our observations are further evidence for the importance of secondary reactions during the redox cascades that are associated with oxidative stress by hypohalous acids.