Abstract
A flow cytometric method for quantitation of glutathione (GSH) was applied to simultaneous analysis of the major leukocyte types in peripheral blood. Cellular thiols (predominantly GSH) were stained with monochlorobimane (MCIB), and thiol fluorescence was measured with a flow cytometer. The fluorescence of the thiols closely reflected the GSH content, as measured by a specific glutathione reductase assay. Fluorescence of individual cell types could be measured after delineating those cells by their light-scatter characteristics, utilizing dual-angle light scatter for discrimination. By this means, GSH contents of 12.5 +/- 2.0 nmol/10(7) neutrophils, 14.5 +/- 2.7 nmol/10(7) monocytes, and 5.0 +/- 1.0 nmol/10(7) lymphocytes were found. The results obtained for neutrophils with the flow cytometer were virtually identical with those obtained with chemical assay in purified samples of neutrophils, indicating the validity of the flow cytometric method.
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