Abstract:This study was designed to determine whether both enantiomers of chloroquine inhibit histamine N-methyltransferase. The mean estimates of IC50 for the d- and l-enantiomers of chloroquine were 4.9 and 17.8 microM (liver), respectively and 6.9 and 21.6 microM (brain), respectively. Ki estimates were significantly lower with d- than with l-chloroquine; hence, d-chloroquine interacts with the enzyme more effectively than l-chloroquine. If the adverse effects of chloroquine are due to the inhibition of histamine N-… Show more
“…22 Evidence suggests that some of the adverse effects of chloroquine are mediated through accumulation of histamine in the tissues because chloroquine inhibits histamine-N-methyltransferase, quantitatively the most important pathway in the metabolism of histamine. 23 To test the hypothesis that local release of histamine could mediate the vasodilatory response observed, we coinfused chloroquine with HI-and H,antagonists. There was a reduction in the venodilatory response to chloroquine infusion, suggesting a role for histamine release in chloroquine-mediated venodilation.…”
Chloroquine produces venodilation at infusion rates that achieve local concentrations likely similar to those observed systemically after clinically relevant intravenous doses. The date also suggest a role for nitric oxide and histamine release in mediating this response.
“…22 Evidence suggests that some of the adverse effects of chloroquine are mediated through accumulation of histamine in the tissues because chloroquine inhibits histamine-N-methyltransferase, quantitatively the most important pathway in the metabolism of histamine. 23 To test the hypothesis that local release of histamine could mediate the vasodilatory response observed, we coinfused chloroquine with HI-and H,antagonists. There was a reduction in the venodilatory response to chloroquine infusion, suggesting a role for histamine release in chloroquine-mediated venodilation.…”
Chloroquine produces venodilation at infusion rates that achieve local concentrations likely similar to those observed systemically after clinically relevant intravenous doses. The date also suggest a role for nitric oxide and histamine release in mediating this response.
“…(FU et al, 1986). Donatelli et al (1994) . Em coelhos, (-)-(R)-CQ apresentou maior meia-vida de eliminação juntamente com maior área sob a curva (AUC) de (+)-(S)-DCQ (AUGUSTIJNS; VERBEKE, 1992).…”
Section: Preparação De Amostras De Origem Biológicaunclassified
MAGALHÃES, I. R. S. Application of liquid-phase microextration to the analysis of some antimalarial drugs and their metabolites in plasma. 2009. 148 p. Thesis (Doctoral Degree).
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