Differences in the reduction kinetics of incorporated spin labels in undifferentiated and differentiated mouse neuroblastoma cells

Significant differences in the rate of reduction of two spin labels, 5-doxylstearic acid and TEMPOL, in the undifferentiated and differentiated NB-15 mouse neuroblastoma cells were demonstrated by using electron paramagnetic resonance (EPR) spectroscopy. The half-time (T1/2) values for decay of the...

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Veröffentlicht in:Biochimica et biophysica acta Jg. 845; H. 2; S. 189
Hauptverfasser: Chen, K Y, McLaughlin, M G
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Netherlands 30.05.1985
Schlagworte:
Animals
Cell Differentiation
Cell Line
Cell Membrane - metabolism
Cyclic N-Oxides - metabolism
Electron Spin Resonance Spectroscopy
Half-Life
Kinetics
Mice
Neuroblastoma - metabolism
Neuroblastoma - pathology
Oxidation-Reduction
Spin Labels
Sulfhydryl Compounds - metabolism
ISSN:0006-3002
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Zusammenfassung:Significant differences in the rate of reduction of two spin labels, 5-doxylstearic acid and TEMPOL, in the undifferentiated and differentiated NB-15 mouse neuroblastoma cells were demonstrated by using electron paramagnetic resonance (EPR) spectroscopy. The half-time (T1/2) values for decay of the EPR signal of 5-doxylstearic acid in the undifferentiated and differentiated neuroblastoma cells were 70 min and 290 min, respectively. The T1/2 values of TEMPOL in the undifferentiated and differentiated cells were 18 min and 34 min, respectively. The cellular reductant was characterized as non-protein-bound sulfhydryl groups. A corresponding difference in the cellular non-protein-bound sulfhydryl content, 19.30 nmol/mg protein for the undifferentiated cells and 6.78 nmol/mg protein for the differentiated cells, was observed. Comparison of the reduction rates of TEMPOL, 5-doxylstearic acid and 16-doxylstearic acid in the undifferentiated NB-15 cells suggested that the permeation of non-protein-bound sulfhydryl compounds from the cytosol to membrane may be responsible for the reduction of the lipid-soluble stearic acid spin labels.
Bibliographie:ObjectType-Article-2
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content type line 23
ISSN:0006-3002
DOI:10.1016/0167-4889(85)90176-4