Identification of leukotriene C-1 as a major component of slow-reacting substance from rat mononuclear cells.

Slow-reacting substance (SRS) was produced by rat peritoneal mononuclear cells after stimulation with the ionophore A23187. The SRS consisted of two main components as judged by high-pressure liquid chromatography (HPLC) on Florisil. The larger and more polar component consisted mainly of leukotriene (LT) C-1 as judged by ultraviolet spectroscopy, mass spectrometry (after desulfurization), amino acid analysis, and conversion by soybean lipoxygenase. Comparisons with authentic LTC-1 showed identity on reverse phase HPLC and guinea pig ileum bioassay. The latter methods are known to distinguish between LTC-1 and stereoisomers of LTC-1.