<prompt> Vasodilation is caused by all, EXCEPT:ProstacyclinThromboxane A2PGE1PGD2  <response>: Principal Inflammatory Actions of Arachidonic Acid Metabolites Eicosanoids ACTION EICOSANOIDS Vasodilation PGI2 prostacyclin, PGE1, PGE2, PGD2 Vasoconstriction Thromboxane A2, leukotrienes C4, D4, E4 Increased vascular permeability Leukotrienes C4, D4, E4Ref: Robbins 8th edition Chapter 2. 