PT  - JOURNAL ARTICLE
AU  - Hou, Cuifen
AU  - Kirchner, Thomas
AU  - Singer, Monica
AU  - Matheis, Michele
AU  - Argentieri, Dennis
AU  - Cavender, Druie
TI  - In Vivo Activity of a Phospholipase C Inhibitor, 1-(6-((17β-3-Methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl)-1<em>H</em>-pyrrole-2,5-dione (U73122), in Acute and Chronic Inflammatory Reactions
AID  - 10.1124/jpet.103.060574
DP  - 2004 May 01
TA  - Journal of Pharmacology and Experimental Therapeutics
PG  - 697--704
VI  - 309
IP  - 2
4099  - http://jpet.aspetjournals.org/content/309/2/697.short
4100  - http://jpet.aspetjournals.org/content/309/2/697.full
SO  - J Pharmacol Exp Ther2004 May 01; 309
AB  - To investigate the role of phospholipase C (PLC) in inflammatory processes, we tested 1-(6-((17β-3-methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl)-1H-pyrrole-2,5-dione (U73122), a widely used PLC inhibitor, in several in vitro and in vivo assays. We first examined the effects of U73122 on human phospholipase C-β (PLC-β) isozymes and found that U73122 significantly inhibited recombinant human PLC-β2, with an IC50 of ∼6 μM. U73122 had little effect on PLC-β1, PLC-β3, or PLC-β4. Consistent with its ability to inhibit PLC-β2 enzymatic activity, U73122 reduced interleukin-8 and leukotriene B4-induced Ca2+ flux and chemotaxis in human neutrophils in a concentration-dependent manner. In vivo, U73122 blocked carrageenan-induced hind paw edema in rats, carrageenan-induced macrophage and lymphocyte accumulation into subcutaneous chambers in dogs, lipopolysaccharide-induced macrophage, lymphocyte infiltration and prostaglandin E2 production in a mouse peritonitis model, and 12-O-tetradecanoylphorbol-13-acetate-induced ear edema in mice. These results implicate PLC-dependent signaling pathways in the development of acute and chronic inflammatory responses in vivo. The American Society for Pharmacology and Experimental Therapeutics