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Expression and role of interleukin-6 in distraction osteogenesis

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Authors
Cho, T.-J.; Kim, J. A.; Chung, C. Y.; Yoo, W. J.; Gerstenfeld, L. C.; Einhorn, T. A.; Choi, I. H.
Issue Date
2007-03-07
Publisher
Springer Verlag
Citation
Calcif Tissue Int 80:192-200
Keywords
3T3 CellsAnimalsCell LineCell ProliferationCytokines/metabolismDose-Response Relationship, DrugInflammationInterleukin-6/*biosynthesis/*physiologyMiceMice, Inbred C3HOsteoblasts/metabolismOsteogenesisRats, Sprague-Dawley
Abstract
Distraction osteogenesis is a special form of bone healing in which well-controlled distraction stresses and consequent tensile strains within callus tissue induce very efficient new bone formation. Proinflammatory cytokines are involved during the early phase of fracture healing and callus remodeling. Temporal expression patterns of proinflammatory cytokines were assessed in Sprague-Dawley rat tibial models of distraction osteogenesis and acute lengthening, and only interleukin-6 (IL-6) was found to be specifically induced during the distraction phase. IL-6 immunoreactivity was detected not only in hemopoietic cells and osteoblasts but also in the spindle-shaped cells of the fibrous interzone, where most of the tensile strains are concentrated. In vitro study revealed that IL-6 did not affect the proliferation of C3H10T1/2 cells, mouse bone marrow stromal cells (MSCs), or MC3T3-E1 cells; but its blocking antibody reduced the proliferation of C3H10T1/2 cells and MSCs. The mRNA expression of COL1A1 and osteopontin were not changed by IL-6 or its blocking antibody, but the alkaline phosphatase activities of MC3T3-E1 cells were increased by IL-6 and decreased by its blocking antibody. These findings indicate that IL-6 is a proinflammatory cytokine that responds to tensile strain during distraction osteogenesis. IL-6 negatively affects the proliferation of primitive mesenchymal cells, whereas the differentiation of more mature osteoblastic lineage cells is enhanced by IL-6 in vitro. IL-6 appears to be one of the cytokines involved in the complex network of signal cascades evoked during distraction osteogenesis and may differentially affect immature and mature osteoblastic lineage cells.
ISSN
0171-967X (Print)
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=17340223

http://hdl.handle.net/10371/12210
DOI
https://doi.org/10.1007/s00223-006-0240-y
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College of Medicine/School of Medicine (의과대학/대학원)Orthopedic Surgery (정형외과학전공)Journal Papers (저널논문_정형외과학전공)
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