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Platelet-derived growth factor expression in primary pulmonary hypertension: comparison of HIV seropositive and HIV seronegative patients

M Humbert, G Monti, M Fartoukh, A Magnan, F Brenot, B Rain, F Capron, P Galanaud, P Duroux, G Simonneau, D Emilie
European Respiratory Journal 1998 11: 554-559; DOI: 10.1183/09031936.98.11030554
M Humbert
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G Monti
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M Fartoukh
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A Magnan
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F Brenot
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B Rain
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F Capron
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P Galanaud
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P Duroux
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G Simonneau
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D Emilie
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Abstract

Primary pulmonary hypertension (PPH) is characterized by intimal fibrosis and cell proliferation (including fibroblasts, smooth muscle and endothelial cells) in the distal pulmonary arterial tree. Considerable interest has been generated by recent reports of PPH in human immunodeficiency virus (HIV)-1-infected individuals. Although the lack of evidence for a pulmonary artery infection has suggested that in such cases HIV may act through mediator release rather than by direct endothelial infection, the mechanisms underlying HIV-associated PPH remain poorly defined. Platelet-derived growth factor (PDGF) has the ability to induce smooth muscle cell and fibroblast proliferation and migration. Given these considerations, we have attempted to document a possible role for PDGF in PPH occurring in HIV seropositive and seronegative patients. Using semiquantitative polymerase chain reaction (PCR), PDGF A-chain messenger ribonucleic acid (mRNA) expression was analysed in surgical lung biopsies from 13 HIV seronegative patients and one HIV seropositive patient, all displaying severe PPH. In parallel, lung samples from two patients with HIV-1-associated PPH were studied by immunohistochemistry and in situ hybridization. Results were compared to those obtained in three HIV-1-infected individuals with no pulmonary complication (as demonstrated by clinical, radiological, bacteriological, and necropsy findings) and five control lung biopsies. As compared to controls, PDGF A-chain mRNA expression is elevated in lung biopsies from patients displaying PPH (p=0.029). In HIV-1-associated PPH, interstitial perivascular cells expressing PDGF A-chain mRNA and protein could be detected by in situ hybridization and immunohistochemistry, respectively. Platelet-derived growth factor expression is elevated in lung biopsies of patients displaying primary pulmonary hypertension. Growth factors such as platelet-derived growth factor may play a part in the initiation and/or progression of primary pulmonary hypertension.

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Platelet-derived growth factor expression in primary pulmonary hypertension: comparison of HIV seropositive and HIV seronegative patients
M Humbert, G Monti, M Fartoukh, A Magnan, F Brenot, B Rain, F Capron, P Galanaud, P Duroux, G Simonneau, D Emilie
European Respiratory Journal Mar 1998, 11 (3) 554-559; DOI: 10.1183/09031936.98.11030554

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Platelet-derived growth factor expression in primary pulmonary hypertension: comparison of HIV seropositive and HIV seronegative patients
M Humbert, G Monti, M Fartoukh, A Magnan, F Brenot, B Rain, F Capron, P Galanaud, P Duroux, G Simonneau, D Emilie
European Respiratory Journal Mar 1998, 11 (3) 554-559; DOI: 10.1183/09031936.98.11030554
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