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- W2000407002 abstract "Our laboratory develops protocols to prevent or reverse ongoing anti-hFIX IgG inhibitors in haemophilia B mice with a F9 gene deletion on BALB/c and C3H/HeJ backgrounds. C3H/HeJ F9(-/Y) mice develop high titre anti-hFIX IgG1 inhibitors and anaphylaxis, whereas most BALB/c F9(-/Y) mice have mild anti-hFIX IgG1 inhibitors and no anaphylaxis. Our aim was to determine if hFIX-specific B- and T-cell responses in BALB/c and C3H/HeJ F9(-/Y) mice trigger the difference in anti-hFIX immune responses. BALB/c and C3H/HeJ F9(-/Y) mice were challenged weekly with recombinant hFIX protein. Humoral immune responses were determined by IgG1 and IgG2a anti-hFIX ELISA, Bethesda assay for inhibitors and B-cell ELISpot on bone marrow and spleen cells. T-cell studies measured the TH 1 (IFN-γ) and TH 2 (IL-4) cytokine responses in splenocytes at the mRNA and protein level in response to hFIX protein. Antibody responses were also measured in C3H/HeJ/OuJ F9(-/Y) mice with restored toll-like receptor 4 (TLR4) function. BALB/c F9(-/Y) mice have a TH 2 skewed response and a reduction in anti-hFIX secreting plasma cells in the bone marrow. Independent antigen challenge revealed both strains generated equivalent IgG1 antibody titres to an intravenously delivered antigen. C3H/HeJ F9(-/Y) mice have a mixed TH 1 and TH 2 response (mainly TH 2). Importantly, TLR4 signalling has a modulatory role in the C3H background on the levels of anti-hFIX IgG1 and incidence of anaphylaxis. The background strain strongly impacts the immune response to hFIX, which can be significantly impacted by mutations in innate immune sensors." @default.
- W2000407002 created "2016-06-24" @default.
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- W2000407002 date "2014-11-23" @default.
- W2000407002 modified "2023-10-02" @default.
- W2000407002 title "Immune responses to human factor IX in haemophilia B mice of different genetic backgrounds are distinct and modified by TLR4" @default.
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- W2000407002 doi "https://doi.org/10.1111/hae.12522" @default.
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