Cellular and Molecular Biology


Regulated expression of MCP-1 by osteoblastic cells in vitro and in vivo

D.T. Graves1, Y. Jiang2 and A.J. Valente3

1Department of Periodontology and Oral Biology, 2Department of Endodontics, Boston University School of Dental Medicine, Boston 3Department of Medicine, University of Texas Health Science Center, San Antonio, Texas, USA

Offprint requests to: Dr. Dana T. Graves, Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston, MA 02118, USA


Summary. Inflammation is characterized by the recruitment of leukocytes from the vasculature. Recent studies have implicated chemokines as an important class of mediators that function principally to stimulate leukocyte recruitment, and in some cases, leukocyte activity. There are four defined chemokine subfamilies based on their primary structure, CXC, CC, C and CX3C. Members of the CC chemokine subfamily, such as monocyte chemoattractant protein 1 (MCP-1), are chemotactic for monocytes and other leukocyte subsets. The studies described below focus on the expression of MCP-1 in vitro and in vivo in an osseous environment. These studies indicate that MCP-1 is typically not expressed in normal bone or by normal osteoblasts in vitro. Upon stimulation by inflammatory mediators, MCP-1 is up-regulated. This expression is temporally and spatially associated with the recruitment of monocytes in both osseous inflammation and during developmentally regulated bone remodelling. Further-more, exogenous MCP-1 applied to inflamed bone enhances the recruitment of monocytes. Because monocytes produce factors that influence osseous metabolism, including but not limited to prostglandins, platelet-derived growth factor, interleukin-1 or tumor necrosis factor, chemokines that initiate their recruitment are likely to be highly important. Histol. Histopathol. 14, 1347-1354 (1999)

Key words: Bone, Chemokine, Cytokine, Osteoblast, Osteoclast, Review

DOI: 10.14670/HH-14.1347