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Blood. 2008 Jun 15;111(12):5621-8. doi: 10.1182/blood-2008-01-134155. Epub 2008 Apr 1.

Capture of plasma membrane fragments from target cells by trogocytosis requires signaling in T cells but not in B cells.

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Institut de Pharmacologie et de Biologie Structurale, Centre National de Recherche Scientifique, Unité Mixte de Recherche 5089, Toulouse, France.


Upon recognition of their respective cellular partners, T and B cells acquire their antigens by a process of membrane capture called trogocytosis. Here, we report that various inhibitors of actin polymerization or of kinases involved in intracellular signaling partially or fully inhibited trogocytosis by CD8(+) and CD4(+) T cells, whereas they had no effect on trogocytosis by B cells. Similarly, trogocytosis by T cells was inhibited at 4 degrees C, whereas in B cells it was independent of temperature, indicating that trogocytosis by B cells does not rely on active processes. By contrast, most inhibitors we tested impaired both T-cell and B-cell activation. The differential effect of inhibitors on T-cell and B-cell trogocytosis was not due to the higher affinity of the B-cell receptor for its cognate antigen compared with the affinity of the T-cell receptor for its own antigen, but it correlated tightly with the abilities of T cells and B cells to form conjugates with their target cells in the presence of inhibitors. Trogocytosis thus has different requirements in different cell types. Moreover, the capture of membrane antigen by B cells is identified as a novel signaling-independent event of B-cell biology.

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