Abstract
Pulmonary embolism (PE) is a life-threatening condition that is associated with the long-term sequelae of chronic pulmonary hypertension. Prior experimental work has suggested that post-PE inflammation is accompanied by pulmonary artery intimal hyperplasia. This study evaluated the effect of the thrombus and tested the hypothesis that thrombolytic, antiplatelet, and anticoagulant agents would decrease pulmonary injury. Male Sprague-Dawley rats (n = 267) underwent laparotomy and temporary clip occlusion of the infrarenal inferior vena cava for the formation of endogenous thrombus or placement of an inert silicone "thrombus." Two days later, repeat laparotomy was performed, the clip removed, and the thrombus or silicone plug was embolized to the lungs. The endogenous thrombus group received normal saline, low-molecular-weight heparin (LMWH), tissue plasminogen activator (tPA), or a gIIB/IIIA antagonist (abciximab). Lung tissue was harvested at various times over 21 days and assayed for total collagen, monocyte chemoattractant protein-1 (MCP-1), interleukin-13 (IL-13), and transforming growth factor-beta (TGF-beta). Fixed sections were stained with trichrome for intimal hyperplasia determination and ED-1 monocytes and alpha-actin-...Continue Reading
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