© 1997 American Heart Association, Inc.
Articles |
Smooth Muscle Cells Express Granulocyte-Macrophage Colony-Stimulating Factor in the Undiseased and Atherosclerotic Human Coronary Artery
From the Department of Cell Biology and Ultrastructure Research, Institute for Arteriosclerosis Research, Münster, Germany (G.P., C.K., H.R.), and Imperial College School of Medicine, National Heart and Lung Institute, Royal Brompton Hospital, London, UK.
Correspondence to Dr Gabriele Plenz, Institute for Arteriosclerosis Research, Department of Cell Biology and Ultrastructure Research, Domagkstr 3, D-48149 Münster, Germany.
Abstract Granulocyte-macrophage colony-stimulating factor (GM-CSF), one of a family of cytokines that regulate proliferation in macrophages and other types of cells, has been implicated in the inflammatory-fibroproliferative response of atherosclerosis. However, previous studies have been restricted to cultured cells and animal models. In the present study, we investigated GM-CSF expression in undiseased and atherosclerotic human coronary arteries at both the mRNA and protein levels. Dual in situ hybridization/cell-marking experiments demonstrated that subpopulations of intimal smooth muscle cells (SMCs) and endothelial cells express the cytokine in the histologically normal human coronary artery and that augmented expression occurs at these sites, and in macrophage accumulations and medial SMCs, in the atherosclerotic vessel. Corresponding data were obtained by in situ hybridization and reverse transcription–polymerase chain reaction and Northern analyses of cultured cells. Cultured human coronary arterial SMCs showed constitutive expression of GM-CSF in cells that had adopted an activated synthetic phenotype. Electron microscope immunocytochemistry revealed that GM-CSF is a protein localized in the cytoplasmic matrix of SMCs of both the undiseased and atherosclerotic vessel wall; extracellular matrix was largely unlabeled, with only occasional small patches of amorphous immunopositive material. The expression of GM-CSF by subpopulations of intimal SMCs in the undiseased artery and the marked upregulation of GM-CSF apparent in atherosclerotic lesions suggest roles for the cytokine in the cellular events underlying initiation and progression of the human atherosclerotic lesion.
Key Words: granulocyte-macrophage colony-stimulating factor • smooth muscle cells • human coronary artery atheroma
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