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. 1995 May;146(5):1140–1149.

Active macrophage-associated TGF-beta co-localizes with type I procollagen gene expression in atherosclerotic human pulmonary arteries.

L Bahadori 1, J Milder 1, L Gold 1, M Botney 1
PMCID: PMC1869280  PMID: 7747808

Abstract

Vascular remodeling in adult atherosclerotic pulmonary arteries is characterized by discrete areas of neointimal smooth muscle cell extracellular matrix gene expression in close proximity to non-foamy macrophages, suggesting regulation by local macrophage-associated factors. The purpose of these studies was to begin addressing the role of putative macrophage-associated factors such as transforming growth factor-beta (TGF-beta), by determining the spatial relationship between TGF-beta and neointimal matrix gene expression in human atherosclerotic pulmonary arteries. For example, the participation of TGF-beta in vascular remodeling could be inferred by its colocalization with non-foamy macrophages in areas of active matrix synthesis. In situ hybridization and immunohistochemistry demonstrated focal neointimal procollagen gene expression in close association with non-foamy but not foamy macrophages. Immunohistochemistry with isoform-specific anti-TGF-beta antibodies demonstrated all three isoforms of TGF-beta associated with non-foamy macrophages, but foamy macrophages were not immunoreactive. Neointimal and medial smooth muscle cells stained lightly. In contrast, intense TGF-beta immunoreactivity was also associated with medial smooth muscle cells in normal nonremodeling vessels. Immunohistochemistry with antibodies specific for latent TGF-beta was similar to immunohistochemistry for mature TGF-beta in both remodeling and nonremodeling vessels. Finally, using an antibody specific for active TGF-beta 1, immunoreactivity was only seen in non-foamy neointimal macrophages but not in foamy macrophages or medial smooth muscle cells from hypertensive or normal vessels. These observations suggest non-foamy macrophages may participate in modulating matrix gene expression in atherosclerotic remodeling via a TGF-beta-dependent mechanism.

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