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Am J Respir Crit Care Med. 2007 Nov 15;176(10):1041-7. Epub 2007 Sep 6.

Role of endothelium-derived CC chemokine ligand 2 in idiopathic pulmonary arterial hypertension.

Author information

1
INSERM U841 and Département de Physiologie Explorations Fonctionnelles, Hôpital H. Mondor, AP-HP, Créteil, France.

Abstract

RATIONALE:

Inflammatory cytokines may affect pulmonary vascular remodeling in idiopathic pulmonary arterial hypertension (IPAH). CC chemokine ligand 2 (CCL2) is synthesized by vascular cells and can stimulate monocyte/macrophage migration and smooth muscle cell (SMC) proliferation.

OBJECTIVES:

To investigate the role of CCL2 in IPAH.

METHODS:

CCL2 levels in plasma, monocytes, lungs, and medium from pulmonary endothelial cell (P-EC) or pulmonary artery SMC (PA-SMC) cultures were measured by ELISA and Western blot analysis. CCL2 receptor CCR2 mRNA levels in monocytes, P-ECs, and PA-SMCs were measured by real-time polymerase chain reaction. Effect of CCL2 on PA-SMC proliferation and migration was assessed using [3H]thymidine incorporation and a modified Boyden's chamber. The effect of endothelial cell-derived CCL2 on monocyte migration was measured using a modified Boyden's chamber.

MEASUREMENTS AND MAIN RESULTS:

Compared with control subjects, we found the following in patients with IPAH: elevated CCL2 protein levels in plasma and lung tissue, whereas monocyte CCL2 levels were similar between patients and control subjects, and elevated CCL2 release by P-ECs or PA-SMCs. P-ECs released twice as much CCL2 than did PA-SMCs. Monocyte migration was markedly increased in the presence of P-ECs, and the increase was larger with P-ECs from patients with IPAH. CCL2-blocking antibodies reduced P-ECs' chemotactic activity by 60%. Compared with controls, PA-SMCs from patients exhibited stronger migratory and proliferative responses to CCL2, in keeping with the finding that CCR2 was markedly increased in PA-SMCs from patients.

CONCLUSIONS:

These results suggest that CCL2 overproduction may be a feature of the abnormal P-EC phenotype in IPAH, contributing to the inflammatory process and to pulmonary vascular remodeling.

PMID:
17823354
DOI:
10.1164/rccm.200610-1559OC
[Indexed for MEDLINE]

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