Reorganization of actin cytoskeleton in the initial stage of transendothelial migration of bone marrow multipotent mesenchymal stromal cells

• Published in: Biofizika Vol. 59; no. 5; p. 913
• Main Authors: Aleksandrova, S A, Pinaev, G P
• Format: Journal Article
• Language: Russian
• Published: Russia (Federation) 01-09-2014
• Subjects: Actin Cytoskeleton - metabolism; Animals; Bone Marrow Cells - cytology; Bone Marrow Cells - metabolism; Cell Line; Endothelial Cells - cytology; Endothelial Cells - metabolism; Mesenchymal Stromal Cells - cytology; Mesenchymal Stromal Cells - metabolism; Rats; Transendothelial and Transepithelial Migration - physiology; Tumor Necrosis Factor-alpha - metabolism
• ISSN: 0006-3029

The analysis of actin cytoskeleton reorganization in rat bone marrow multipotent mesenchymal stromal cells after one hour adhesion to a monolayer of endothelial cell line EA.hy 926 allowed us to identify three types of cells interacting with the endothelial cells. Approximately half of multipotent mesenchymal stromal cells retained a rounded shape, most of them contained large round actin aggregates, had irregular borders and contacted with the surface of the endothelial cells by microvilli or protrusions similar to small lamellae. Almost all other cells were surrounded by narrow lamellae along the entire perimeter. In addition, a small amount.of elongated flattened cells that contacting with endothelial cells by means of focal contacts was observed. Microenvironmental factors such as proinflammatory cytokine tumor necrosis factor α or plasma proteins affected the ratio of stromal cell types, with different types of organization of the actin cytoskeleton in multipotent mesenchymal stromal cells population.