Table of Contents
ISRN Inflammation
Volume 2013 (2013), Article ID 259256, 9 pages
http://dx.doi.org/10.1155/2013/259256
Research Article

Monocyte Migration Driven by Galectin-3 Occurs through Distinct Mechanisms Involving Selective Interactions with the Extracellular Matrix

1Programa de pós-graduação em Imunologia Básica e Aplicada, FMRP/USP, Ribeirão Preto, SP, Brazil
2Faculdade de Ciências e Letras, Universidade Estadual Paulista (UNESP), Campus de Assis, São Paulo, SP, Brazil
3Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, FMRP/USP, Ribeirão Preto, SP, Brazil
4Departamento de Biologia Geral, UFV, Viçosa, MG, Brazil
5Centro de Investigação Translacional em Oncologia, Instituto do Câncer do Estado de São Paulo, São Paulo, SP, Brazil
6Departamento de Enfermagem Materno-Infantil e Saúde Pública, EERP/USP, 3900-14040-902 Ribeirão Preto, SP, Brazil

Received 11 January 2013; Accepted 28 January 2013

Academic Editors: B. Bigalke, B. Kim, and M. Reale

Copyright © 2013 Cláudia Danella Polli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Monocyte migration into tissues, an important event in inflammation, requires an intricate interplay between determinants on cell surfaces and extracellular matrix (ECM). Galectin-3 is able to modulate cell-ECM interactions and is an important mediator of inflammation. In this study, we sought to investigate whether interactions established between galectin-3 and ECM glycoproteins are involved in monocyte migration, given that the mechanisms by which monocytes move across the endothelium and through the extravascular tissue are poorly understood. Using the in vitro transwell system, we demonstrated that monocyte migration was potentiated in the presence of galectin-3 plus laminin or fibronectin, but not vitronectin, and was dependent on the carbohydrate recognition domain of the lectin. Only galectin-3-fibronectin combinations potentiated the migration of monocyte-derived macrophages. In binding assays, galectin-3 did not bind to fibronectin, whereas both the full-length and the truncated forms of the lectin, which retains carbohydrate binding ability, were able to bind to laminin. Our results show that monocytes migrate through distinct mechanisms and selective interactions with the extracellular matrix driven by galectin-3. We suggest that the lectin may bridge monocytes to laminin and may also activate these cells, resulting in the positive regulation of other adhesion molecules and cell adhesion to fibronectin.