Production of cysteinyl-dopamine during intravenous dopamine therapy

11Citations
Citations of this article
11Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

Background. Oxidized dopamine rapidly forms thiol-conjugates with -SH groups on cysteine, glutathione, and proteins. We used cysteinyl-dopamine production as an index of thioester production during intravenous dopamine treatment of critically ill patients. Methods. Cysteinyl-dopamine and catecholamines were measured by high-performance liquid chromatography with electrochemical detection. The production of cysteinyl-dopamine by purified human neutrophils was measured using dopamine (1 μmol/L) and cysteine (1 mmol/L) concentrations similar to those found during dopamine treatment. To examine the impact of endotoxic shock on cysteinyl-dopamine production, anesthetized rats were given dopamine (12 to 15 μg/kg/min intravenously) with or without endotoxin (50 mg/kg intravenously). Results. In vitro, neutrophils converted 26% of dopamine to cysteinyl-dopamine (30 min at 37°C). Activating neutrophils with zymogen increased dopamine consumption from 26 to 68%, but only 36% appeared as cysteinyl-dopamine. The remainder may have been oxidized to other cysteinyl derivatives. Endotoxin increased cysteinyl-dopamine in rat plasma from 2.5 nmol/L (range <0.2 to 11) to 9.7 nmol/L (range <0.3 to 31, P = 0.1). After four hours, with or without endotoxin, cysteinyl-dopamine was <0.3 nmol/L in cerebrospinal fluid. In the plasma of eight patients receiving dopamine (6 to 20 μg/kg/min for 1 to 3 days), dopamine was 0.5 to 9.9 μmol/L, and cysteinyl-dopamine was 48 to 1660 nmol/L. Cysteinyl-dopamine was 4.3 to 22.6% of dopamine and correlated with leukocyte count (r2 = 0.388, P = 0.099). Conclusions. A significant fraction of exogenously administered dopamine reacts with -SH groups of cysteine and probably also with -SH groups on peptides and proteins. During brief dopamine treatment of endotoxic shock in rats, neither dopamine nor cysteinyl-dopamine crossed the blood-brain barrier.

Cite

CITATION STYLE

APA

Magnay, J. L., Tong, J., Drangova, R., & Baines, A. D. (2001). Production of cysteinyl-dopamine during intravenous dopamine therapy. Kidney International, 59(5), 1891–1898. https://doi.org/10.1046/j.1523-1755.2001.0590051891.x

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free