The rat carotid body superfused with low p0, exhibited an optical absorbance spectrum which resembles the reduced spectrum of the NADPH oxidase in neutrophils.Diphenylene iodonium (DPI) as a specific inhibitor of the oxidase attenuated the reduced absorbance spectrum in the carotid body. Also absorbance bleaching by low doses of cyanide (50 and 100 pM) was inhibited by DPI, whereas higher doses of cyanide (300 PM) caused an absorbance spectrum typical for reduced cytochromes.It is concluded that an NADPH oxidase acts as a p0, sensor in the carotid body with low affinity for oxygen and high affinity for cyanide.
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