Prostaglandin, Leukotriene, and Thromboxane Synthesis Eric Niederhoffer SIU-SOM Pathway overview Prostaglandin receptors Pathway details Differential actions.

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Presentation transcript:

Prostaglandin, Leukotriene, and Thromboxane Synthesis Eric Niederhoffer SIU-SOM Pathway overview Prostaglandin receptors Pathway details Differential actions of cyclooxygenases COX-1 and COX-2 comparison COX-1 specificity of common NSAIDs Tissue comparison

Pathway Overview Linoleic acid Thromboxane A 2 synthase Lipoxygenase Arachidonic acid Prostaglandin H 2 synthase Prostaglandins (PG)Leukotrienes (LT) Thromboxanes (TXA) Anti-inflammatory steroids Glucocorticoids NSAIDs aspirin Zileuton

Prostaglandin Receptors

Pathway Details Phospholipase A 2 (or PLC) Membrane phospholipids Cyclooxygenase O2O2 Arachidonic acid PGG 2 PGH 2 PG hydroperoxidase 2GSH GSSG NSAIDS (aspirin) Anti-inflammatory steroids Glucocorticoids (mediated by lipocortin-Ca 2+ ) IL-1R IL-1 (inflammation) PGI 2 (PC)PGE 2 PGI 2 synthasePGE 2 synthase PGD 2 PGF 2  PGD 2 synthase PGF 2 synthase PGH 2 synthase LTD 4 LTE 4 LTB 4 LTC 4 Glutathione S-transferase LTA 4 TXA 2 TXA 2 synthase PGJ 2

Differential Actions of Cyclooxygenases NSAIDs COX1 Constitutive COX2 Inducible Inflammatory Endothelial integrity Vascular patency Gastric mucosal integrity Bronchodilation Renal function Platelet function Inflammation Unwanted side- effects Therapeutic antiinflammatory effects PGE 2 PGF 2  Proteases PGI 2 PGE 2 TXA 2 Housekeeping

COX-1 and COX-2 Comparison

COX-1 Specificity of Common NSAIDs Generally, the more selective for COX-1, the more serious side-effects appear

Tissue Comparison Ar Brain/nerveVascular bedsSynovial cells PGH 2 PGF 2  PGD 2 PGE 2 PGI 2 (PC) PGE 2 PGI 2 (PC) PGE 2 TXA 2 So what would happen if we gave a patient a large dose of aspirin or Coxib to reduce inflammation/pain in these tissues?

Review Questions How are prostaglandins, leukotrienes, and thromboxanes synthesized (substrates, enzymes, cofactors)? What is the nomenclature for prostaglandin receptors? How do NSAIDs work? How do steroids work? What are the important characteristics of COX-1 and COX-2?