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Cytokine production by CD4+ T cells specific for coagulation factor VIII in healthy subjects and haemophilia A patientsFinancial support: This study was supported by the NHLBI grant HL61922 (to B.M.C.-F.) and HL65578 (to N.S.K).
13 September 2006
Accepted after resubmission 01 March 2007
24 November 2017 (online)
HaemophiliaA patients treated with human factorVIII (fVIII) may develop antibody (Ab) inhibitors to fVIII. FVIII-specific CD4+ T cells are common in haemophilia A patients, but also in healthy subjects who do not have a sustained anti-fVIII Ab response. Here, we examined the fVIII-induced IFNγ -, IL-4- and TGF- β 1-producing CD4+ T blasts by culturing peripheral blood mononuclear cells (PBMC) from controls and patients with recombinant fVIII. FVIII exposure significantly increased IFNγ - and IL-4-, but not TGF-β 1-producing CD4+ T blasts in patients with inhibitors. Patients without inhibitors had fVIII-induced IFNγ - andTGF-β 1-,but not IL-4-producing CD4+ T blasts.Controls did not have IL-4-producing CD4+ T blasts. However, controls whose PMBC proliferated in response to fVIII had fVIII-induced CD4+ T blasts that produced IFN-γ, the number of which correlated with the intensity of the proliferative response to fVIII of their PMBC, whereas controls whose PMBC did not proliferate to fVIII had predominantly fVIII-induced CD4+ T blasts that producedTGF- β 1.The presence in controls and patients without inhibitors of fVIII-induced IFN-γ -producing CD4 + T cells, but not IL-4-producing CD4+ T cells, which are abundant in inhibitor patients, suggests a role of Th1 cells in initiating the immune response to fVIII, and of Th2 cells in the development of strong inhibitor production. The polarized high ratios of Th3/Th1 and Th3/Th2 in controls and patients without inhibitors suggest that a preponderance ofTh3 cells in the response to fVIII may help to maintain tolerance to fVIII.
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