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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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High-dose factor VIII inhibits factor VIII-specific memory B cells in hemophilia A with factor VIII inhibitors.

Hemophilia A in its severe form is a life-threatening hemorrhagic disease that is caused by mutations in the factor VIII (FVIII) gene (symbol F8). About 25% of patients who receive replacement therapy develop neutralizing antibodies that inhibit the function of substituted FVIII. Long-term application of high doses of FVIII has evolved as an effective therapy to eradicate the antibodies and to induce long-lasting immune tolerance. Little is known, however, about the immunologic mechanisms that cause the down-modulation of anti-FVIII antibodies by high doses of FVIII. We report that high doses of FVIII inhibit the restimulation of FVIII-specific memory B cells and their differentiation into antibody-secreting plasma cells in vitro and in vivo in a murine model of hemophilia A. The inhibition of memory B-cell responses is irreversible and not mediated by FVIII-specific T cells. Furthermore, it seems to involve the activation of caspases. We conclude that the inhibition of FVIII-specific memory B cells might be an early event in the down-modulation of anti-FVIII antibodies in patients with hemophilia A who receive high doses of FVIII.[1]

References

  1. High-dose factor VIII inhibits factor VIII-specific memory B cells in hemophilia A with factor VIII inhibitors. Hausl, C., Ahmad, R.U., Sasgary, M., Doering, C.B., Lollar, P., Richter, G., Schwarz, H.P., Turecek, P.L., Reipert, B.M. Blood (2005) [Pubmed]
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