Abstract
Arachidonate 12-lipoxygenase in the platelet was the first mammalian lipoxygenase discoverved1. It catalyzes the transformation of arachidonic acid into 12(S)-hydroperoxyeicosatetraenoic acid, which is subsequently converted to 12(S)-hydroxyeicosatetraenoic acid (12(S)-HETE) by a glutathione-dependent peroxidase2. We recently identified a human 12-lipoxygenase as the platelet-type enzyme in human epidermoid carcinoma A431 cells, and found that epidermal growth factor (EGF) increased the 12-lipoxygenase mRNA level by about 2-fold with a lag peroid of 10 h, which was parallel to the increase in enzyme activity3. This was the first evidence indicating the inducibility of a human 12-lipoxygenase gene expression by growth factor. In studying the signal transduction of EGF in the induction of 12-lipoxygenase expression, we recently reported the possible involvement of protein kinase C activation in the expression of EGF-induced 12-lipxoygenase4. The biological activities of 12(S)-HETE induces the expression of glycoprotein Ilb-IIIa on the cell membrane of Lewis lung carcinoma cells5 and may also play a significant role in the pathogenesis of some epidermal and epithelial inflammation6. Takahashi et al.7 identified 12-lipoxygenase in human epidermal cells as a platelet-type enzyme and Hussain et al.8 recently found an overexpression of the human platelet-type 12-lipoxygenase in germinal layer keratinocytes in psoriasis.
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Keywords
- A431 Cell
- Enzyme Protein
- Lewis Lung Carcinoma Cell
- Hydroxyeicosatetraenoic Acid
- Epidermal Growth Factor Treatment
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References
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© 1997 Springer Science+Business Media New York
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Chang, WC., Liu, YW., Chen, BK., Chen, CJ. (1997). Regulation of 12-Lipoxygenase Expression by Epidermal Growth Factor in Human Epidermoid Carcinoma A431 Cells. In: Honn, K.V., Marnett, L.J., Nigam, S., Jones, R.L., Wong, P.YK. (eds) Eicosanoids and other Bioactive Lipids in Cancer, Inflammation, and Radiation Injury 3. Advances in Experimental Medicine and Biology, vol 407. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1813-0_6
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