The expression of cytokine activity by fracture callus

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
T A EinhornMark C Horowitz

Abstract

Cytokines, a group of proteins known to regulate hemopoietic and immune functions, are also involved in inflammation, angiogenesis, and bone and cartilage metabolism. Since all of these processes occur following bone injury, or are known to contribute to wound repair mechanisms, this investigation sought to test the hypothesis that cytokines are involved in fracture healing. Two sets of 60 male Sprague-Dawley rats underwent the production of standard closed femoral fractures. The animals were then euthanized in groups of 15 on days 3, 7, 14, and 21 postfracture. A separate control group was also used for the harvesting of intact unfractured bone. At the time of euthanasia, calluses or bone specimens were explanted to organ culture and treated with either media alone or media containing the inducing agents lipopolysaccharide or concanavalin A. A titration of conditioned medium from these cultures was then added to factor-dependent clonal cell lines that are known to be specifically responsive to interleukin-1, interleukin-6, granulocyte-macrophage colony stimulating factor or macrophage-colony stimulating factor. To confirm the identities of each of these cytokines, neutralizing antibody studies were performed. The results showe...Continue Reading

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