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Sökning: WFRF:(Ossendorp F)

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  • Fransen, M. F., et al. (författare)
  • A Restricted Role for FcgammaR in the Regulation of Adaptive Immunity
  • 2018
  • Ingår i: Journal of Immunology. - : The American Association of Immunologists. - 0022-1767 .- 1550-6606. ; 200:8, s. 2615-2626
  • Tidskriftsartikel (refereegranskat)abstract
    • By their interaction with IgG immune complexes, FcgammaR and complement link innate and adaptive immunity, showing functional redundancy. In complement-deficient mice, IgG downstream effector functions are often impaired, as well as adaptive immunity. Based on a variety of model systems using FcgammaR-knockout mice, it has been concluded that FcgammaRs are also key regulators of innate and adaptive immunity; however, several of the model systems underpinning these conclusions suffer from flawed experimental design. To address this issue, we generated a novel mouse model deficient for all FcgammaRs (FcgammaRI/II/III/IV(-/-) mice). These mice displayed normal development and lymphoid and myeloid ontogeny. Although IgG effector pathways were impaired, adaptive immune responses to a variety of challenges, including bacterial infection and IgG immune complexes, were not. Like FcgammaRIIb-deficient mice, FcgammaRI/II/III/IV(-/-) mice developed higher Ab titers but no autoantibodies. These observations indicate a redundant role for activating FcgammaRs in the modulation of the adaptive immune response in vivo. We conclude that FcgammaRs are downstream IgG effector molecules with a restricted role in the ontogeny and maintenance of the immune system, as well as the regulation of adaptive immunity.
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  • Kessler, Jan H., et al. (författare)
  • Antigen processing by nardilysin and thimet oligopeptidase generates cytotoxic T cell epitopes
  • 2010
  • Ingår i: Nature Immunology. - : Springer Science and Business Media LLC. - 1529-2908 .- 1529-2916. ; 12:1, s. 45-53
  • Tidskriftsartikel (refereegranskat)abstract
    • Cytotoxic T lymphocytes (CTLs) recognize peptides presented by HLA class I molecules on the cell surface. The C terminus of these CTL epitopes is considered to be produced by the proteasome. Here we demonstrate that the cytosolic endopeptidases nardilysin and thimet oligopeptidase (TOP) complemented proteasome activity. Nardilysin and TOP were required, either together or alone, for the generation of a tumor-specific CTL epitope from PRAME, an immunodominant CTL epitope from Epstein-Barr virus protein EBNA3C, and a clinically important epitope from the melanoma protein MART-1. TOP functioned as C-terminal trimming peptidase in antigen processing, and nardilysin contributed to both the C-terminal and N-terminal generation of CTL epitopes. By broadening the antigenic peptide repertoire, nardilysin and TOP strengthen the immune defense against intracellular pathogens and cancer.
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  • Resultat 1-6 av 6

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