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The membrane fraction of guinea pig polymorphonuclear leukocytes stimulated with phorbol myristate acetate exhibits the respiratory burst NADPH oxidase activity. This activity is markedly unstable at 37 degrees C, disappearing with a half-life of 11.0 min. When the membrane fraction was pretreated with 0.1% glutaraldehyde, the NADPH oxidase was found to become more stable; its half-life increased about sixfold without any enhancement of the initial activity. The glutaraldehyde treatment of the membrane fraction also protected the NADPH oxidase against inactivation with 0.1-0.2% Triton X-100. These stabilizing effects of glutaraldehyde on the NADPH oxidase seem to be due to its protein cross-linking ability, since its monovalent analogue, butyraldehyde, did not show any effect on the NADPH oxidase activity. In fact, sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that glutaraldehyde cross-linked many proteins constituting the membrane.
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