Abstract
Rat elicited polymorphonuclear leucocytes (PMNs), when exposed to the ionophore A23187, release three isomers of leukotriene B 4. The three isomers have been purified and tested for their ability to induce the chemokinesis of human PMNs in vitro, the aggregation of rat PMNs in vitro and changes in vascular permeability in rabbit skin in vivo in the presence of PGE 2. The results demonstrate that all three isomers are biologically active and that the enzymatically produced isomer, in which the conjugated triene contains one cis and two trans double bonds, is more potent than the two diastereoisomers of LTB 4 which contain all trans double bonds in the conjugated triene and which are produced by non-enzymatic hydrolysis.
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