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Induction of superoxide in glioma cell line U87 stimulated with lipopolysaccharide and interferon‐γ: ESR using a new flow‐type quartz cell
Author(s) -
Nakagawa Hidehiko,
Moritake Takashi,
Tsuboi Koji,
Ikota Nobuo,
Ozawa Toshihiko
Publication year - 2000
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(00)01398-3
Subject(s) - nitric oxide , superoxide dismutase , chemistry , superoxide , microbiology and biotechnology , cell culture , spin trapping , interferon gamma , lipopolysaccharide , sod1 , biochemistry , biology , radical , immunology , oxidative stress , enzyme , in vitro , genetics , organic chemistry
The production of superoxide and nitric oxide induced in U87 glioma treated with lipopolysaccharide (LPS) and interferon‐γ (IFN‐γ) was examined by electron spin resonance (ESR) spectroscopy using a newly designed flow‐type quartz cuvette without detaching cells from the culture plate. ESR spectra of 2,2,6,6‐tetramethyl‐4‐hydroxy‐1‐piperidinyloxy (TEMPOL) with U87 cells on a quartz culture plate were measured at 15 min intervals. The signal intensity of TEMPOL decreased in the presence of U87 cells at the pseudo‐first order rate. The signal decay was accelerated in the U87 cells treated with LPS/IFN‐γ for 24 h, and was suppressed in the presence of superoxide dismutase and catalase. By the spin‐trapping method, nitric oxide from U87 cells pretreated with LPS/IFN‐γ for 24 h was measured by the ESR, but only a weak signal of nitric oxide adducts was detected. Further, the nitrite and nitrate levels in the medium did not increase for 24 h. By the ESR measurement of cells on culture plates without detachment stress, it was found that the production of superoxide was induced by LPS/IFN‐γ, but that of nitric oxide was not, in U87 glioma cells.