Work

Hydralazine-dependent carbon dioxide free radical formation by metabolizing mitochondria.

Year: 1988

Type: article

Abstract: The addition of hydralazine (1-hydrazinophthalazine) to rat liver mitochondria metabolizing malate/glutamate causes formation of a carbon-centered free radical which was spin-trapped with phenyl-t-butylnitrone (PBN) or dimethylpyrrolidine-N-oxide (DMPO). The coupling constants of the spin-trapped free radical were AN = 16.1, AH beta = 4.6 G for PBN and AN = 15.9, AH beta = 18.9 G for DMPO-trapped radical in aqueous solution. The spin-trapped free radical was shown to be the carbon dioxide anion free radical by independent synthesis, high pressure liquid chromatography separation, and electron paramagnetic resonance characterization. The amount of carbon dioxide anion free radical produced was absolutely dependent upon the presence of hydralazine and varied depending on mitochondrial substrate, with by far the highest amount produced by pyruvate. Studies with 13C-labeled pyruvate demonstrated that the carbon dioxide free radical came from C-1 of this compound.

Source: Journal of Biological Chemistry

DOI: 10.1016/s0021-9258(18)37957-2

Authors: P K Wong, J L Poyer, C M DuBose, R A Floyd

Institution: Oklahoma Medical Research Foundation

Language: English

Topic: Electron Spin Resonance Studies

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,430

Funders: National Cancer Institute, National Institute of Environmental Health Sciences