LTB4 as marker of 5-LO inhibitory activity of two new N- ω-ethoxycarbonyl-4-quinolones

Abstract

The supposed 5-LO inhibitory activity of two N- ω-ethoxycarbonyl-4-quinolones was tested determining leukotriene B4 (LTB 4) in RBL-1 cell cultures, pretreated with the two compounds of interest. LTB 4, obtained by solid-phase extraction (SPE) from celle cultures supernatants, was determined by micellar electrokinetic chromatography (MEKC). The analysis was performed using an uncoated capillary, filled with borate buffer at pH 8.3, containing 12.5 mM SDS as micelles generator. Therefore, following the decreasing of LTB 4 it was possible to verify the 5-LO inhibitory activity of two quinolone derivatives. To asses the suitability of the use of LTB 4 as marker of the activity of the new compounds, the analysis was repeated using quercetin, a well known 5-LO inhibitor.