Pulmonary vein stenosis: expression of receptor tyrosine kinases by lesional cells

Cardiovascular Pathology : the Official Journal of the Society for Cardiovascular Pathology
Wolfram F J RiedlingerTucker Collins

Abstract

Primary pulmonary vein stenosis (PVS) is a progressive disorder of infants. Although catheter based intervention and chemotherapy are used to manage the disorder, the benefit of these approaches is reduced considerably by restenosis. The nature of the intimal cells causing the occlusive lesions in PVS is poorly understood. Seven PVS cases were studied with antibodies for smooth muscle actin (SMA), muscle-specific actin (MSA), monoclonal desmin, S100 protein, CD31, CD34, CD45RO, CD68, CD99, Ki-67 (MIB-I), and with antibodies directed against several receptor tyrosine kinases (RTK), including platelet-derived growth factor alpha and beta receptor (PDGFR-alpha and -beta), epidermal growth factor receptor (EGFR), fibroblast growth factor receptor (FGFR), vascular endothelial growth factor 1 and 2 receptor (VEGFR), and stem cell factor receptor (c-kit). Lesional cells stained strongly and diffusely with SMA and MSA, but not for macrophage, lymphocyte, endothelial markers, or for Ki-67. RTK expression was strong and diffuse for PDGFR-alpha and -beta, FGFR, and VEGFR-2. Lesional cells stained for VEGF and PDGF beta receptor was phosphorylated. The histologic appearance, and the strong diffuse immunoreactivity for smooth muscle markers...Continue Reading

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