Macrophage activation results in bone resorption.

Published

Journal Article (Review)

Monocytes or macrophages from important accessory cells in the regulation of bone metabolism and destruction. Cells of the mononuclear phagocyte lineage form the precursor cells of the osteoclasts. Soluble products produced by activated macrophages regulate progenitor cell proliferation, recruitment, differentiation, and activity of osteoblasts and osteoclasts. After osteoclasts are removed from the resorption site, macrophages process bone surfaces and create a cement line before osteoblasts enter to form new bone. Although osteolysis associated with normal bone remodeling is seen as an osteoclast driven process, it may be that in chronic inflammation macrophage activation and vascular derangements lead to low pH, local bone demineralization (acid attack), and H+ mediated stimulation of the primary afferent nociceptive nerve fibers (bone pain). Osteoclasts are not able to attach to demineralized bone or to osteoid surfaces. However, if macrophages degrade the demineralized organic bone matrix, chemotactic factors and attachment sites for osteoclasts are produced. In such a scenario, the osteoclast-osteoblast mediated activation, resorption, and formation cycle would be secondarily activated. Such events may play a role in the most common orthopaedic problem related to macrophage activation, aseptic loosening of orthopaedic joint implants, which is secondary to a chronic foreign body reaction and to micromovement.

Full Text

Duke Authors

Cited Authors

  • Lassus, J; Salo, J; Jiranek, WA; Santavirta, S; Nevalainen, J; Matucci-Cerinic, M; Horák, P; Konttinen, Y

Published Date

  • July 1998

Published In

Start / End Page

  • 7 - 15

PubMed ID

  • 9678028

Pubmed Central ID

  • 9678028

International Standard Serial Number (ISSN)

  • 0009-921X

Language

  • eng

Conference Location

  • United States