Expression of matrix metalloproteases by fibrocytes: possible role in migration and homing

American Journal of Respiratory and Critical Care Medicine
Carolina García-de-AlbaAnnie Pardo

Abstract

Fibrocytes are progenitor cells characterized by the simultaneous expression of mesenchymal, monocyte, and hematopoietic stem cell markers. We previously documented their presence in lungs of patients with idiopathic pulmonary fibrosis. However, the mechanisms involved in their migration, subsequent homing, and local role remain unclear. Matrix metalloproteinases (MMPs) facilitate cell migration and have been implicated in the pathogenesis of pulmonary fibrosis. To evaluate the expression and role of matrix metalloproteinases in human fibrocytes. Fibrocytes were purified from CD14(+) monocytes and cultured for 8 days; purity of fibrocyte cultures was 95% or greater as determined by flow cytometry. Conditioned media and total RNA were collected and the expression of MMP-1, MMP-2, MMP-7, MMP-8, and MMP-9 was evaluated by real-time polymerase chain reaction. Protein synthesis was examined using a Multiplex assay, Western blot, fluorescent immunocytochemistry, and confocal microscopy. MMP-2 and MMP-9 enzymatic activities were evaluated by gelatin zymography. Migration was assessed using collagen I-coated Boyden chambers. Stromal cell-derived factor-1α and platelet-derived growth factor-B were used as chemoattractant with or without...Continue Reading

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