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Time course of incorporation of 20-carbon polyunsaturated fatty acids in a human keratinocyte cell line

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Lipids

Abstract

Human keratinocytes (NCTC 2544) in culture were labeled with equal amounts of either14C-arachidonic acid,14C-dihomo-γ-linolenic acid or14C-eicosapentaenoic acid. At various time points, the incubations were stopped and the distribution of the14C-fatty acids was analyzed. All these eicosanoid precursor fatty acids were effectively incorporated into the cellular lipids of the keratinocytes, and the major radiolabeled individual lipid fraction was phosphatidylethanolamine. The distributions of arachidonic acid and dihomo-γ-linolenic acid within cellular lipids were rather the same. However, less eicosapentaenoic acid than either arachidonic acid or dihomo-γ-linolenic acid was incorporated into the phospholipids and, correspondingly, more eicosapentaenoic acid was incorporated into the nonphosphorus lipids. In the phosphatidylinositol + phosphatidylserine fraction, there was significantly less eicosapentaenoic acid than either arachidonic acid or dihomo-γ-linolenic acid. The present study suggests that these eicosanoid precursor fatty acids are effectively incorporated into the human keratinocytes and that the pattern of incorporation and distribution of eicosapentaenoic acid appears to differ slightly from that of either arachidonic acid or dihomo-γ-linolenic acid.

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Author notes

  1. Kari Punnonen & Taplo Puustinen

    Present address: Department of Physiological Chemistry, Karolinska Institutet, S-10401, Stockholm, Sweden

Authors and Affiliations

  1. Department of Dermatology, University of Turku, 20520, Turku, Finland

    Christer T. Jansen

  2. Department of Physiology, University of Turku, Kiinamyllynkatu 10, 20520, Turku, Finland

    Kari Punnonen & Taplo Puustinen

Authors
  1. Kari Punnonen
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  2. Taplo Puustinen
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  3. Christer T. Jansen
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Punnonen, K., Puustinen, T. & Jansen, C.T. Time course of incorporation of 20-carbon polyunsaturated fatty acids in a human keratinocyte cell line. Lipids 22, 139–143 (1987). https://doi.org/10.1007/BF02537291

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  • DOI: https://doi.org/10.1007/BF02537291

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