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Activity of platelet-activating factor (PAF) acetylhydrolase in plasma from healthy habitual cigarette smokers

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Summary

The activity of platelet-activating factor acetylhydrolase, a specific metabolizing enzyme of platelet-activating factor (PAF), in plasma of 39 male subjects was determined radiochemically by the method of Stafforini et al., (1987) J Biol Chem 262: 4223–4230, to clarify to what extent PAF affects atherosclerotic disorders induced by habitual smoking. The subjects examined included 18 habitual smokers (mean age: 62±10.6 years) and 21 age-matched nonsmokers. Plasma PAF acetylhydrolase activity was higher in the smokers than in the nonsmokers. There was no difference between smokers and nonsmokers in platelet aggregability in response to PAF or ADP. A higher apoprotein B/apoprotein A-I ratio in smokers as compared to nonsmokers was the only manifestation of abnormal lipoprotein metabolism in the former group. In the smokers, plasma PAF acetylhydrolase activity was directly proportional to total cholesterol, LDL-cholesterol, triglyceride, apoprotein B, LDL-cholesterol/HDL-cholesterol or apoprotein B/apoprotein A-I, and inversely proportional to HDL-cholesterol or apoprotein A-I. The results obtained suggest that alterations in PAF acetylhydrolase levels result from a slightly abnormal lipoprotein metabolism. Determination of plasma PAF acetylhydrolase activity is useful to study the role of PAF in atherosclerotic changes induced by smoking.

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Authors and Affiliations

  1. Department of Pathologic Physiology, Institute of Cerebrovascular Diseases, Hirosaki University School of Medicine, Japan

    Tada-atsu Imaizumi, Kei Satoh, Hidemi Yoshida, Yoko Kawamura, Makoto Hiramoto, Masahiro Koyanagi & Shigeru Takamatsu

  2. Training Course for School Nursing, Faculty of Education, Hirosaki University, 5 Zaifu-cho, 036, Hirosaki, Japan

    Mutsu Takamatsu

Authors
  1. Tada-atsu Imaizumi
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  2. Kei Satoh
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  3. Hidemi Yoshida
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  4. Yoko Kawamura
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  5. Makoto Hiramoto
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  6. Masahiro Koyanagi
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  7. Shigeru Takamatsu
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  8. Mutsu Takamatsu
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Imaizumi, Ta., Satoh, K., Yoshida, H. et al. Activity of platelet-activating factor (PAF) acetylhydrolase in plasma from healthy habitual cigarette smokers. Heart Vessels 5, 81–86 (1990). https://doi.org/10.1007/BF02058322

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  • DOI: https://doi.org/10.1007/BF02058322

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