A Phase I, Single Centre, Double-blind, Randomised, Placebo-controlled, Parallel-group, 2-part Study to Assess the Safety, Tolerability and Pharmacokinetics of Single and Multiple Ascending Inhaled Doses of AZD9819 in Healthy Subjects

The purpose of the study is to assess safety and tolerability of AZD9819 following inhaled administration of single and multiple increasing doses, and to estimate the maximum dose that is tolerated in healthy people.

Start Date01 Aug 2010

Sponsor / Collaborator

AstraZeneca PLC

100 Clinical Results associated with AZD-9819

100 Translational Medicine associated with AZD-9819

100 Patents (Medical) associated with AZD-9819

Literatures (Medical) associated with AZD-9819

01 Oct 2015·Drug Metabolism and DispositionQ2 · MEDICINE

Lipid Peroxide–Mediated Oxidative Rearrangement of the Pyrazinone Carboxamide Core of Neutrophil Elastase Inhibitor AZD9819 in Blood Plasma Samples

Q2 · MEDICINE

Article

Author: Hosagrahara, Vinayak P ; Wells, Andrew S ; Gu, Chungang ; Svensson, Per H ; Hallström, Gösta ; Johnsson, Eskil ; Lewis, Richard J

This study focused on the mechanistic interpretation of ex vivo oxidation of a candidate drug in blood plasma samples. An unexpected lipid peroxide-mediated epoxidation followed by a dramatic rearrangement led to production of a five-membered oxazole derivative from the original six-membered pyrazinone-carboxamide core of a human neutrophil elastase inhibitor, 6-(1-(4-cyanophenyl)-1H-pyrazol-5-yl)-N-ethyl-5-methyl-3-oxo-4-(3-(trifluoromethyl)phenyl)-3,4-dihydropyrazine-2-carboxamide (AZD9819). The rearranged oxidation product 2-(1-(4-cyanophenyl)-1H-pyrazol-5-yl)-5-(N-ethylacetamido)-N-(3-(trifluoromethyl)phenyl)oxazole-4-carboxamide was characterized by accurate-mass tandem mass spectrometry fragmentations, by two-dimensional NMR and X-ray crystallography of an authentic standard, and by incorporation of an (18)O atom from molecular (18)O2 to the location predicted by our proposed mechanism. The lipid peroxide-mediated oxidation was demonstrated by using human low-density lipoprotein (LDL) in pH 7.4 phosphate buffer and by inhibiting the oxidation with ascorbic acid or l-glutathione, two antioxidants effective in both plasma and the LDL incubation. A nucleophilic mechanism for the epoxidation of AZD9819 by lipid hydroperoxides explains the prevention of its ex vivo oxidation by acidification of the plasma samples. The discovery of the lipid peroxide-dependent oxidation of an analyte and the means of prevention could provide valuable information for biotransformation and bioanalysis.

100 Deals associated with AZD-9819

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