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      저자 : Yasaman Movahednezhad (검색결과 1 건)
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        Abnormal frequency of the memory B cell subsets and plasmablasts in patients with congenital severe hemophilia A: correlation with “Inhibitor” formation

        Omid Reza Zekavat,Yasaman Movahednezhad,Amin Shahsavani,Sezaneh Haghpanah,Negin Shokrgozar,Hossein Golmoghaddam,Mehdi Kalani,Mohammad Reza Bordbar,Nargess Arandi 대한혈액학회 2024 Blood Research Vol.59 No.2

        Background Development of antibodies against infused Factor VIII (FVIII) or "inhibitors" represents a major challenge following FVIII replacement therapy in patients with hemophilia A (HA). Recent studies have shown that certain cellular compartments of the immune system contribute to the production of such antibodies. Herein, we determined the frequency of class-switched CD19+ IgD−CD27+/non-class-switched CD19+ IgD+CD27+ memory B cell subsets and CD19+ CD27hiCD38hi plasmablasts in patients with severe HA and their association with the development of inhibitors in these patients. Methods This cross-sectional case–control study enrolled 32 patients with severe HA, including 8 with and 24 without inhibitors, and 24 healthy individuals. The frequencies of the memory B cell subsets and plasmablasts were determined using flow cytometry. Results The frequency of CD19+ IgD+CD27+ non-class-switched memory B cells was significantly lower in patients with HA (including both patients with and without inhibitors) than in healthy controls. The percentages of both CD19+ IgD−CD27+ class-switched and CD19+ IgD+CD27+ non-class-switched memory B cells did not differ significantly between patients with and without inhibitors. HA patients with inhibitors had significantly higher proportions of CD19+ CD27hiCD38hi plasmablasts than the control group as well as the inhibitor (-) ones. No significant correlation was observed between the inhibitor levels with the percentages of memory B cell subsets and plasmablasts. Conclusion This study is the first to demonstrate a dysregulated proportion of CD19+ IgD+CD27+ non-class-switched memory B cells and CD19+ CD27hiCD38hi plasmablasts in patients with severe HA. Therefore, strategies targeting memory B-cell/plasmablast differentiation may have promising outcomes in the management of inhibitor formation in patients with severe HA.

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