Publication Type Journal Article
Title Synthesis and oxidation of 2-hydroxynevirapine, a metabolite of the HIV reverse transcriptase inhibitor nevirapine
Authors Alexandra Maria Moita Antunes David A. Novais João Ferreira da Silva P P Santos M. Conceição Oliveira Frederick A. Beland M. Matilde Marques
Groups BioMol
Journal ORGANIC \& BIOMOLECULAR CHEMISTRY
Year 2011
Month
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Volume 9
Number 22
Pages 7822-7835
Abstract Nevirapine (11-cyclopropyl-5,11-dihydro-4-methyl-6H-dipyrido[3,2-b:2 3 e][1,4]d iazepin-6-one, NVP) is a non-nucleoside HIV-1 reverse transcriptase inhibitor used to prevent mother-to-child transmission of the virus. However, severe hepatotoxicity and serious adverse cutaneous effects have raised concerns about the safety of NVP administration. NVP metabolism yields several phenol-type derivatives conceivably capable of undergoing further metabolic oxidation to electrophilic quinoid species that could react with bionucleophiles. The covalent adducts thus formed might be at the genesis of toxic responses. As an initial step to test this hypothesis, we synthesized the phenolic metabolite, 2-hydroxy-NVP, and investigated its oxidation in vitro. Using potassium nitrosodisulfonate and sodium periodate as model oxidants, we obtained evidence for fast generation of an electrophilic quinone-imine, which readily underwent hydrolytic conversion to fully characterized spiro derivatives, 1 -cyclopropyl-4-methyl-1H,1 H-spiro[pyridine-2,2 -pyrido[2,3-d]pyri midine]-3,4 ,6(3 H)-trione in aqueous media and 1 -cyclopropyl-4-methyl-1 H,2H-spiro[pyridine-3,2 -pyrido[2,3-d]pyri midine]2,4 ,6(1H,3 H)-trione in non-aqueous media. The spiro compound generated in aqueous solution underwent subsequent hydrolytic degradation of the NVP ring system, whereas the one formed in non-aqueous media was stable to hydrolysis. The product profile observed with the chemical oxidants in aqueous solution was replicated using lactoperoxidase-mediated oxidation of 2-hydroxy-NVP. These observations suggest that metabolic activation of NVP, via Phase I oxidation to 2-hydroxy-NVP and subsequent generation of a quinone-imine, could occur in vivo and play a role in NVP-induced toxicity.
DOI http://dx.doi.org/10.1039/c1ob06052j
ISBN
Publisher
Book Title
ISSN 1477-0520
EISSN 1477-0539
Conference Name
Bibtex ID ISI:000296203700033
Observations
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