西亚试剂：Conversion of mature B cells into T cells by dedifferentiat

Conversion of mature B cells into T cells by dedifferentiation to uncommitted progenitors

César Cobaleda1,3, Wolfram Jochum2 & Meinrad Busslinger1

Correspondence to: Meinrad Busslinger1 Correspondence and requests for materials should be addressed to M.B. (Email: busslinger@imp.ac.at).

Lineage commitment and differentiation to a mature cell type are considered to be unidirectional and irreversible processes under physiological conditions1. The commitment of haematopoietic progenitors to the B-cell lineage2, 3 and their development to mature B lymphocytes4, 5 critically depend on the transcription factor encoded by the paired box gene 5 (Pax5). Here we show that conditional Pax5 deletion in mice allowed mature B cells from peripheral lymphoid organs to dedifferentiate in vivo back to early uncommitted progenitors in the bone marrow, which rescued T lymphopoiesis in the thymus of T-cell-deficient mice. These B-cell-derived T lymphocytes carried not only immunoglobulin heavy- and light-chain gene rearrangements but also participated as functional T cells in immune reactions. Mice lacking Pax5 in mature B cells also developed aggressive lymphomas, which were identified by their gene expression profile as progenitor cell tumours. Hence, the complete loss of Pax5 in late B cells could initiate lymphoma development and uncovered an extraordinary plasticity of mature peripheral B cells despite their advanced differentiation stage.

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