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Pulmonary vascular remodeling in congenital heart disease: enhanced expression of heat shock proteins. | LitMetric

Pulmonary vascular remodeling in congenital heart disease: enhanced expression of heat shock proteins.

Indian J Biochem Biophys

Department of Pediatric Cardiology, Center for Congenital Heart Diseases, University Medical Center Groningen, University of Groningen.

Published: December 2009

AI Article Synopsis

Article Abstract

In congenital heart disease (CHD), mechanical wall stress by increased pulmonary artery pressure and pulmonary blood flow is believed to play a pivotal role in the pathogenesis of pulmonary plexogenic arteriopathy (PPA). The pathogenesis of this disease that involves significant pulmonary arterial remodelling, is, however, largely unknown. In the systemic circulation, upregulation of HSP-70 and HSP-27 in the arterial wall occurs in response to acute hypertension, whereas HSP-60 and increased titres of anti-HSP-60 antibodies are associated with atherosclerotic vessel disease. We looked for the involvement of HSPs in the stress response of pulmonary endothelial and vascular smooth muscle cells in different abnormal hemodynamic conditions in patients with CHDs. We analyzed the expression pattern of HSP-27, HSP-70 and HSP-60 in lung biopsies of 38 patients with CHD, using immunohistochemistry. These included 4 individuals with an essentially normal pulmonary circulation, who served as controls. Immunoreactivity against HSP-27 and also against HSP-70 was present in the pulmonary endothelium and vascular smooth muscle cells of patients and controls in a similar pattern. In contrast, expression of HSP-60 was absent in pulmonary arteries of both patients and controls. In patients with advanced PPA, cells within plexiform lesions showed strong staining for HSP-27 and HSP-70, but were again negative for HSP-60. The intensity of immunoreactivity against HSP-70 correlated inversely with medial thickness of pre-acinar arteries (r = -0.32; p = 0.04). Expression of HSP-27 and HSP-70 did not correlate with hemodynamic parameters, although immunoreactivity against HSP27 tended to be increased in cases with high pulmonary artery pressure (r = 0.37; p = 0.16) and was highest in patients with flow-associated pulmonary hypertension (p<0.01). HSP-27 and HSP-70, but not HSP-60 are engaged in the stress response of cells of small pulmonary arteries in pulmonary plexogenic arteriopathy. HSP-27 and HSP-70 are increasingly expressed in the advanced proliferative lesions of this disease.

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