Xbp1s-negative tumor B cells and pre-plasmablasts mediate therapeutic proteasome inhibitor resistance in multiple myeloma.
Xbp1s-negative tumor B cells and pre-plasmablasts mediate therapeutic proteasome inhibitor resistance in multiple myeloma.
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DOI:
10.1016/j.ccr.2013.08.009
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发表时间:
2013-09-09
期刊:
影响因子:
50.3
通讯作者:
Tiedemann RE
中科院分区:
文献类型:
--
作者:
Leung-Hagesteijn C;Erdmann N;Cheung G;Keats JJ;Stewart AK;Reece DE;Chung KC;Tiedemann RE
Proteasome inhibitor (PI) resistance mechanisms in multiple myeloma (MM) remain controversial. We report the existence of a progenitor organization in primary MM that recapitulates maturation stages between B cells and plasma cells and that contributes to clinical PI resistance. Xbp1s− tumor B cells and pre-plasmablasts survive therapeutic PI, preventing cure, while maturation-arrest of MM before plasmablast stage enables progressive disease on PI treatment. Mechanistically, suppression of Xbp1s in MM is shown to induce bortezomib resistance via de-comittment to plasma cell maturation and immunoglobulin production, diminishing endoplasmic reticulum (ER) front loading and cytotoxic susceptibility to PI-induced inhibition of ER-associated degration (ERAD). These results reveal the tumor progenitor structure in MM and highlight its role in therapeutic failure.
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