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
Tiedemann RE
中科院分区:
医学1区
文献类型:
--
作者:
Leung-Hagesteijn C;Erdmann N;Cheung G;Keats JJ;Stewart AK;Reece DE;Chung KC;Tiedemann RE

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多发性骨髓瘤(MM)中蛋白酶体抑制剂(PI)耐药机制仍存在争议。我们报告了原发性MM中存在的祖细胞组织,其重现了B细胞和浆细胞之间的成熟阶段,并有助于临床PI抗性。Xbp 1 s-肿瘤B细胞和前浆母细胞在治疗性PI中存活,阻止治愈,而在浆母细胞阶段之前MM的成熟停滞使PI治疗的疾病进展。从机制上讲,MM中Xbp 1 s的抑制可诱导硼替佐米耐药,其途径是通过破坏浆细胞成熟和免疫球蛋白产生、减少内质网(ER)前负荷和对PI诱导的ER相关降解(ERAD)抑制的细胞毒性易感性。这些结果揭示了MM中的肿瘤祖细胞结构,并突出了其在治疗失败中的作用。
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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