Lymphocytes and their Involvement in the Foreign Body Response to Biomaterials and Tissue Repair

MIKE BARBECK; OLE JUNG

doi:10.21873/invivo.14283

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Figure 1.
T-cell responses to biomaterial classes. Heatmap summarizing Th1, Th2, Th17, and Treg activities in response to bone substitutes, collagen scaffolds, titanium, magnesium, and synthetic polymers. Color gradient indicates intensity of pro-inflammatory vs. pro-regenerative activity (0=low, 3=strong).
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Figure 2.
B-cell responses to biomaterial interfaces. Heatmap depicting antibody production, plasma cell infiltration, immune complex formation, and fibrosis risk across biomaterial classes. Color gradient indicates intensity of pro-inflammatory vs. pro-regenerative activity (0=low, 3=strong).
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Figure 3.
NK-cell responses to biomaterials. Heatmap visualizing cytotoxicity, IFN-γ release, angiogenesis promotion, and fibrosis risk in relation to material type. Color gradient indicates intensity of pro-inflammatory vs. pro-regenerative activity (0=low, 3=strong).
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Figure 4.
Lymphocyte responses to biomaterials and interactions with other immune cells. Flowchart illustrating the adaptive immune cascade following biomaterial implantation. Protein adsorption with conformational changes (IgG/IgE Fc exposure, complement C3b/C5a generation, fibrinogen/fibronectin denaturation) activates APCs and triggers lymphocyte recruitment. B cells produce antibodies, differentiate into plasma cells, and secrete IL-6, leading to immune complex formation, complement activation, and chronic inflammation amplification. T cell polarization via activated DCs generates four distinct subsets: Th1 cells (IFN-γ, TNF-α) drive M1 macrophage activation and chronic inflammation; Th2 cells (IL-4, IL-5, IL-13) promote M2 macrophage polarization and tissue remodeling; Th17 cells (IL-17, IL-22) recruit neutrophils and sustain inflammation; Tregs (IL-10, TGF-β) suppress immune activation and support resolution. NK cells, activated by stress ligands, release IFN-γ (enhancing M1 activation), VEGF (promoting angiogenesis), and perforin/granzymes (cytotoxic clearance). Pro-inflammatory pathways converge to cause fibrotic encapsulation with MNGC and plasma cell infiltration, leading to implant failure. Pro-regenerative pathways result in ECM turnover, vascularization, and successful integration. Color coding: blue=initial events; pink=B cells; light blue=T cell polarization; orange=NK cells; red=M1/adverse outcomes; green=M2/favorable outcomes. APCs: Antigen-presenting cells; C3b/C5a: complement components 3b/5a; DCs: dendritic cells; ECM: extracellular matrix; IFN-γ: interferon-gamma; IgE/IgG: immunoglobulin E/G; IL: interleukin; M1/M2: classically/alternatively activated macrophage; MNGC: multinucleated giant cell; NK: natural killer; TGF-β: transforming growth factor-beta; Th1/Th2/Th17: T helper type 1/2/17; TNF-α: tumor necrosis factor-alpha; Treg: regulatory T cell; VEGF: vascular endothelial growth factor.