Electron spin resonance studies on isolated hepatocytes treated with ferrous or ferric iron.
Isolated rat hepatocytes incubated with iron salts in the presence of the spin trapping agent alpha-4-pyridyl-l-oxide N-tert-butyl nitrone (4-POBN) generate a clear electron spin resonance signal; this signal is not detectable in the absence of exogenous iron. The hyperfine splitting constants are identical whether ferrous or ferric iron is used. The free radical trapped does not appear to be an active oxygen species but rather a carbon-centred radical, which we here ascribe to a lipodienyl radical on the basis of its hyperfine splitting features. Support to this interpretation is lent by the fact that no such radical could be generated in hepatocytes fully protected against lipid peroxidation by pretreating the donor rats with alpha-tocopherol.
Poli
G
G
Institute of General Pathology, University of Turin, Italy.
Albano
E
E
Tomasi
A
A
Cheeseman
K H
KH
Chiarpotto
E
E
Parola
M
M
Biocca
M E
ME
Slater
T F
TF
Dianzani
M U
MU
D000818:Animals; D002478:Cells, Cultured; D002712:Chlorides; D004578:Electron Spin Resonance Spectroscopy; D005290:Ferric Compounds / Q000494:pharmacology*; D005296:Ferrous Compounds / Q000494:pharmacology*; D005609:Free Radicals; D008099:Liver / Q000166:cytology / Q000187:drug effects*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D014810:Vitamin E / Q000494:pharmacology
D002712:Chlorides; D005290:Ferric Compounds; D005296:Ferrous Compounds; D005609:Free Radicals; D014810:Vitamin E; C020748:ferrous sulfate; C024555:ferric chloride