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The action of Ca2+ on H2O2 formation catalyzed by an NADPH-dependent H2O2-generating system was studied in a thyroid particulate fraction. It was shown that H2O2 formation was inhibited by EGTA and restored in the presence of micromolar concentrations of free Ca2+, and that Mg2+ was unable to restore the activity of the EGTA-inhibited particulate fraction.… (More)
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Solubilization of the thyroid particulate-associated NADPH-dependent H2O2 generating system has been tested with different detergents; (3-(3-cholamidopropyl)-dimethylammonio)1-propane sulfonate (CHAPS) was found to be the best of the six detergents tested. The ratio of H2O2 generation to NADPH oxidation was similar for CHAPS extract and native particulate… (More)