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a Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, Connecticut 06520-8063
Shed menstrual endometrium is viable and has the ability to implant and grow in women, who eventually develop endometriosis. Many of the cell-to-cell or cell-to-extracellular matrix (ECM) connections are mediated by integrins. Monocyte chemotactic protein (MCP)-1, a potent chemotactic factor produced in many cell types, is elevated in the peritoneal fluid of women with endometriosis. In this study, we investigated whether endometrial stromal cell (ESC) adhesion itself induces the expression of MCP-1 and whether this process is integrin mediated. ESC were plated on Petri dishes and 24-well plates coated with fibronectin, laminin, collagen IV, poly-L-lysine, or mouse anti-human integrin ß1 and ß2 monoclonal antibodies. Adherence of ESC to various ECM substrates, except for poly-L-lysine, a non-integrin-dependent adhesion matrix, induced the expression of MCP-1 at both mRNA and protein levels. Engagement of ß1-containing integrins was associated with ESC adhesion and resulted in up-regulation of MCP-1 gene expression and protein secretion. Disruption of the actin cytoskeleton by treating ESC with cytochalasin D completely blocked the increase of MCP-1 induced in response to integrin activation. These findings indicate a novel mechanism of MCP-1 regulation. Cell adhesion to ECM is an important event that leads to stimulation of MCP-1 expression, and this process is mediated by integrins.
2 Correspondence: Aydin Arici, Yale University School of Medicine, Department of Obstetrics & Gynecology, 333 Cedar Street, New Haven, CT 06520–8063. FAX: 203 785 7134; aydin.arici{at}yale.edu
3 Current address: Juan A. Garcia-Velasco, Instituto Valenciano de Infertilidad, IVI-Madrid, Spain.
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