Abstract
Nonpigmented epithelial (NPE) cells and pigmented epithelial (PE) cells were separated from porcine ciliary processes without protease treatment. The relative capabilities of NPE cells and PE cells to synthesize 5-hydroxyeicosatetraenoic acid (5-HETE), 12-HETE, and 5,12-diHETE from 1-[14C] arachidonic acid were determined. HETE compounds were separated by HPLC. The capability of NPE cells to synthesize 5-lipoxygenase and 12-lipoxygenase products was, respectively, five-fold and 2.5 fold higher than that of PE cells. The formation of 5-HETE, 12-HETE and 5,12-diHETE was inhibited virtually completely by 50 microM nordihydroguaiaretic acid but not by 5 microM indomethacin. The major product formed both by NPE cells and PE cells was 12-HETE.
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