Isomers of leukotriene B4 possess different biological potencies.
Rat elicited polymorphonuclear leucocytes (PMNs), when exposed to the ionophore A23187, release three isomers of leukotriene B4. 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 PGE2. 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 LTB4 which contain all trans double bonds in the conjugated triene and which are produced by non-enzymatic hydrolysis.
D000818:Animals; D001095:Arachidonic Acids / Q000302:isolation & purification / Q000494:pharmacology*; D001202:Ascitic Fluid / Q000166:cytology; D000001:Calcimycin / Q000494:pharmacology; D002199:Capillary Permeability / Q000187:drug effects*; D002449:Cell Aggregation / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D006801:Humans; D007975:Leukotriene B4; D009504:Neutrophils / Q000187:drug effects / Q000502:physiology*; D011458:Prostaglandins E / Q000494:pharmacology; D011817:Rabbits; D051381:Rats; D012867:Skin / Q000098:blood supply; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
D001095:Arachidonic Acids; D011458:Prostaglandins E; D007975:Leukotriene B4; D000001:Calcimycin