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2015 ; 11
(3
): 189-94
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Alternative pathways of osteoclastogenesis in inflammatory arthritis
#MMPMID25422000
Adamopoulos IE
; Mellins ED
Nat Rev Rheumatol
2015[Mar]; 11
(3
): 189-94
PMID25422000
show ga
Osteoclasts are cells of haematopoietic origin that are uniquely specialized to
degrade bone. Under physiological conditions, the osteoclastogenesis pathway
depends on macrophage colony-stimulating factor 1 (CSF-1, also known as M-CSF)
and receptor activator of nuclear factor ?B ligand (RANKL). However, an emerging
hypothesis is that alternative pathways of osteoclast generation might be active
during inflammatory arthritis. In this Perspectives article, we summarize the
physiological pathway of osteoclastogenesis and then focus on experimental
findings that support the hypothesis that infiltrating inflammatory cells and the
cytokine milieu provide multiple routes to bone destruction. The precise identity
of osteoclast precursor(s) is not yet known. We propose that myeloid cell
differentiation during inflammation could be an important contributor to the
differentiation of osteoclast populations and their associated pathologies.
Understanding the dynamics of osteoclast differentiation in inflammatory
arthritis is crucial for the development of therapeutic strategies for
inflammatory joint disease in children and adults.