Effects of nitrogen dioxide on red blood cells of rats: Changes in components of red cell membranes during in vivo exposure to NO2 |
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Authors: | Kunimitsu Kaya Takashi Miura Kentaro Kubota |
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Institution: | Division of Basic Medical Sciences, National Institute for Environmental Studies, Yatabe, Tsukuba, Ibaraki 305, Japan |
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Abstract: | Red cell membranes, prepared from red blood cells of rats exposed to 4, 10, or 20 ppm nitrogen dioxide (NO2) for 1 to 10 days, were examined for evidence of changes in membrane components. Appreciable changes were not found in contents of phospholipid and cholesterol during exposure to 10 ppm NO2. By contrast, protein content altered with the time of exposure. Moreover, changes in protein composition were observed by employing sodium dodecyl sulfate — polyacrylamide gel electrophoresis. Twenty-four-hour exposure to NO2 at the concentration above 10 ppm resulted in a marked increase in the percentage of lysophosphatidylethanolamine (LysoPE) to the total phospholipids. The prolonged exposure to 10 ppm NO2 gave rise to a further increase in LysoPE, whereas the percentage of phosphatidylethanolamine (PE) showed a gradual decrease. A 1-day exposure to 4.0 ppm NO2 also caused an increase in sialic acid content and decreases in those of PE and hexose. In addition to contents of these components the percentage of LysoPE increased 5 days after exposure and the elevated values were maintained up to the end of exposure period. These results demonstrate that red blood cells in circulation exhibit different membrane properties in terms of lipid and carbohydrate composition during 10 days of exposure to 4.0 ppm NO2. |
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Keywords: | CMH glucosylceramide CDH lactosylceramide CTH galactosylgalacto-sylglucosylceramide PE phosphatidylethanolamine PC phosphatidylcholine SPH sphingomyelin PI phosphatidylinositol LPE lysophosphatidylethanolamine PS phosphatidylserine PA phosphatidic acid LPC lysophosphatidylcholine |
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