RT Journal Article SR Electronic T1 PROSTAGLANDIN E1, ASPIRIN AND THE ACTION OF LEUKOCYTIC ENDOGENOUS MEDIATOR JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 516 OP 519 VO 188 IS 3 A1 Charles R. Merriman A1 Herbert F. Upchurch A1 Ralph F. Kampschmidt YR 1974 UL http://jpet.aspetjournals.org/content/188/3/516.abstract AB Leukocytic endogenous mediator (LEM) induces numerous changes typical of those seen during the acute phase of inflammation. The possibility that LEM was acting through prostaglandin E1 (PGE1) was investigated. PGE1 failed to mimic the effects of LEM when injected intracisternally or intravenously. Injection of PGE1 intracisternally increased temperature in rats whereas injections of LEM produced hypothermia. Aspirin, an inhibitor of prostaglandin synthesis, did not block LEM induced release of neutrophils from the bone marrow or the lowering of plasma iron levels. The combination of these two findings plus the variety of routes used to administer both PGE1 and aspirin make it unlikely that PGE1 is involved in either lowering of plasma iron or the release of neutrophils from the bone marrow during the acute phase of inflammation. © 1974 by The Williams & Wilkins Co.