Summary
We have examined the histological and cytoskeletal changes in rat connective tissues induced by subcutaneous perfusion with cytokines. Granulocyte macrophage-colony stimulating factor (GM-CSF), tumor necrosis factor-α (TNF-α), interleukin-1-α (IL-l-α), transforming growth factor-β (TGF-β) and platelet-derived growth factor (PDGF) produced a significant fibroblast accumulation, neovascular development and a weak to moderate leukocyte infiltration, while interleukin-2 (IL-2) and γ-interferon (γ-IFN) induced intense mononucleated leukocyte infiltration. Immunofluorescence staining showed that accumulated fibroblastic cells were positive for α-smooth muscle (SM) actin (but negative for the desmin and muscle myosin) only in GM-CSF-treated tissues. Electron microscopic examination established that a signifikant proportion of fibroblastic cell in GM-CSF-, IL-l-α- or TGF-β-treated animals were typical myofibroblasts. Only in GM-CSF-treated animals did microfilament bundles of myofibroblasts contain α-SM actin, when examined by immuno electron microscopy. Our results suggest that locally applied cytokines induce the formation of distinct granulation tissues. In particular, GM-CSF stimulates a-SM actin synthesis in myofibroblasts, illustrating an unexpected extra-hematopoietic in vivo effect of this factor.
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Rubbia-Brandt, L., Sappino, AP. & Gabbiani, G. Locally applied GM-CSF induces the accumulation of α-smooth muscle act in containing myofibroblasts. Virchows Archiv B Cell Pathol 60, 73–82 (1991). https://doi.org/10.1007/BF02899530
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DOI: https://doi.org/10.1007/BF02899530