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H2O2 Sensors of Lungs and Blood Vessels and Their Role in the Antioxidant Defense of the Body

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Abstract

This paper considers the composition and function of sensory systems monitoring H2O2 level by the lung neuroepithelial cells and carotid bodies. These systems are localized in the plasma membrane of the corresponding cells and are composed of O 2• -generating NADPH-oxidase and an H2O2-activated K+ channel. This complex structure of the H2O2 sensors is probably due to their function in antioxidant defense. By means of these sensors, an increase in the H2O2 level in lung or blood results in a decrease in lung ventilation and constriction of blood vessels. This action lowers the O2 flux to the tissues and, hence, intracellular [O2]. The [O2] decrease, in turn, inhibits intracellular generation of reactive oxygen species. The possible roles of such systems under normal conditions (e.g., the effect of O 2• in air) and in some pathologies (e.g., pneumonia) is discussed.

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  1. Department of Bioenergetics, Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119899, Russia

    V. P. Skulachev

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Skulachev, V.P. H2O2 Sensors of Lungs and Blood Vessels and Their Role in the Antioxidant Defense of the Body. Biochemistry (Moscow) 66, 1153–1156 (2001). https://doi.org/10.1023/A:1012489131436

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