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• W2167519860 abstract "1 The symptoms of paraquat poisoning depend largely on the amount of compound consumed, although in many cases the most characteristic feature of poisoning is lung damage, causing severe anoxia which leads to death. 2 Studies in experimental animals have demonstrated that paraquat produces an acute damaging phase in the lung, followed by a reparative phase dominated by an extensive fibrosis. The latter is a major contributor to the lung lesion that causes anoxia. The specific toxicity in the lung can be explained in part by the selective accumulation of paraquat into this organ in comparison with other tissues. The accumulation is energy-dependent and probably specific to certain lung cells. 3 It is now known that paraquat is accumulated into the lung by a recently described diamine transport process located in the alveolar epithelial cells and the Clara cells of the airways. When accumulated, paraquat undergoes a NADPH-dependent one-electron reduction to form its free radical which almost instantly reacts with molecular oxygen to reform the cation and concomitantly produce superoxide anion. This species of oxygen radical can contribute to the formation of more toxic species of radical which may directly damage vital cellular constituents. 4 Paraquat has been shown to stimulate rapidly the pentose phosphate pathway and inhibit the synthesis of fatty acids in the lung in a dose-dependent manner. In addition there is a rapid increase in the pulmonary levels of mixed disulphides and the eventual reduction of NADPH levels in the lung. 5 These results are consistent with the suggestion that paraquat causes a rapid and pronounced oxidation of NADPH which initiates compensatory biochemical responses in the lung. 6 With toxic levels of paraquat the compensatory biochemical processes are insufficient to maintain levels of NADPH consistent with cell viability. Thus, cell death may result from NADPH depletion, or the loss of this vital co-factor may render the lung more susceptible to free-radical attack and thereby peroxidation of vital cellular constituents." @default.
• W2167519860 created "2016-06-24" @default.
• W2167519860 creator A5031081756 @default.
• W2167519860 date "1987-01-01" @default.
• W2167519860 modified "2023-09-30" @default.
• W2167519860 title "Mechanism of Paraquat Toxicity in Lung and its Relevance to Treatment" @default.
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• W2167519860 doi "https://doi.org/10.1177/096032718700600105" @default.
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