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Monocytes Stimulated by 110-kDa Fibronectin Fragments Suppress Proliferation of Anti-CD3-Activated T Cells

One hundred ten to 120-kDa fragments of fibronectin (FNf), generated by proteases released in the course of tissue injury and inflammation, stimulate monocytes to produce proinflammatory cytokines, promote mononuclear leukocytes (MNL) transendothelial migration, up-regulate monocyte CD11b and CD86 e...

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Published in:The Journal of immunology (1950) 2005-09, Vol.175 (5), p.3347-3353
Main Authors: Birdsall, Holly H, Porter, Wendy J, Trial, JoAnn, Rossen, Roger D
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container_title The Journal of immunology (1950)
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description One hundred ten to 120-kDa fragments of fibronectin (FNf), generated by proteases released in the course of tissue injury and inflammation, stimulate monocytes to produce proinflammatory cytokines, promote mononuclear leukocytes (MNL) transendothelial migration, up-regulate monocyte CD11b and CD86 expression, and induce monocyte-derived dendritic cell differentiation. To investigate whether the proinflammatory consequences of FNf are offset by responses that can suppress proliferation of activated T lymphocytes, we investigated the effect of FNf-treated MNL on autologous T lymphocytes induced to proliferate by substrate-immobilized anti-CD3. FNf-stimulated MNL suppressed anti-CD3-induced T cell proliferation through both contact-dependent and contact-independent mechanisms. Contact-independent suppression was mediated, at least in part, by IL-10 and TGF-beta released by the FNf-stimulated MNL. After 24-48 h exposure to FNf, activated T cells and monocytes formed clusters displaying CD25, CD14, CD3, and CD4 that were not dissociable by chelation of divalent cations. Killing monocytes with l-leucine methyl ester abolished these T cell-monocyte clusters and the ability of the FNf-stimulated MNL to suppress anti-CD3 induced T cell proliferation. Thus, in addition to activating MNL and causing them to migrate to sites of injury, FNf appears to induce suppressor monocytes.
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subjects CD3 Complex - immunology
Fibronectins - pharmacology
Humans
Immune Tolerance
Leucine - analogs & derivatives
Leucine - pharmacology
Lipopolysaccharide Receptors - analysis
Lipopolysaccharide Receptors - physiology
Lymphocyte Activation - drug effects
Monocytes - drug effects
Monocytes - physiology
Peptide Fragments - pharmacology
T-Lymphocytes - immunology
title Monocytes Stimulated by 110-kDa Fibronectin Fragments Suppress Proliferation of Anti-CD3-Activated T Cells
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