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PNAS | April 30, 2002 | vol. 99 | no. 9 | 6029-6034
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Cell Biology
 Heparin-binding EGF-like growth factor mediates the biological effects of P450 arachidonate epoxygenase metabolites in epithelial cells

Jian-Kang Chen*, Jorge Capdevila*,dagger , and Raymond C. Harris*,Dagger

Departments of * Medicine and dagger  Biochemistry, Vanderbilt University, Nashville, TN 37232

Edited by Pedro M. Cuatrecasas, University of California School of Medicine, San Diego, CA, and approved March 5, 2002 (received for review December 14, 2001)

In addition to its important functions in detoxification of foreign chemicals and biosynthesis of steroid hormones, the cytochrome P450 enzyme system metabolizes arachidonate to 14,15-epoxyeicosatrienoic acid (14,15-EET). This study demonstrates that a P450 arachidonate epoxygenase metabolite can activate cleavage of heparin-binding epidermal growth factor-like growth factor (HB-EGF) and delineates an essential role for HB-EGF in the mitogenic effects of this lipid mediator. Blockade of HB-EGF processing or EGF receptor (EGFR) inhibited 14,15-EET-stimulated early mitogenic signals and DNA synthesis. 14,15-EET failed to induce mitogenesis in cell lines expressing minimal HB-EGF, whereas 14,15-EET induced soluble HB-EGF release into the conditioned media of cell lines that both express high levels of HB-EGF and display mitogenic response to this lipid mediator. Moreover, transfection of a bacterial 14,15-epoxygenase established intracellular endogenous 14,15-EET biosynthesis in cultured cell systems, which allowed direct confirmation of involvement of EGFR transactivation in the endogenous 14,15-EET-mediated mitogenic signaling pathway. This mechanism involves EET-dependent activation of metalloproteinases and release of the potent mitogenic EGFR ligand, HB-EGF.

Dagger To whom reprint requests should be addressed. E-mail: ray.harris{at}mcmail.vanderbilt.edu.

www.pnas.org/cgi/doi/10.1073/pnas.092671899
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