Expression of 5-lipoxygenase in differentiating human skin keratinocytes. |
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Authors: | U Janssen-Timmen P J Vickers U Wittig W D Lehmann H J Stark N E Fusenig T Rosenbach O R?dmark B Samuelsson A J Habenicht |
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Affiliation: | Department of Internal Medicine, University of Heidelberg, Medical School, Germany. |
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Abstract: | We studied the expression of arachidonate 5-lipoxygenase (5-LO) in a cell line of human keratinocytes (HaCaT) and in normal human skin keratinocytes in tissue culture. In undifferentiated keratinocytes 5-LO gene expression was low or undetectable as determined by 5-LO mRNA, protein, cell-free enzyme activity, and leukotriene production in intact cells. However, after shift to culture conditions that promote conversion of prokeratinocytes into a more differentiated phenotype, 5-LO gene expression was markedly induced in HaCaT cells and, to a lesser extent, in normal keratinocytes. These results show that 5-LO gene expression is an intrinsic property of human skin keratinocytes. |
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