Loss of PRDM1/BLIMP-1 function contributes to poor prognosis of activated B-cell-like diffuse large B-cell lymphoma.

Loss of PRDM1/BLIMP-1 function contributes to poor prognosis of activated B-cell-like diffuse large B-cell lymphoma.
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DOI:
10.1038/leu.2016.243
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发表时间:
2017-03
期刊:
影响因子:
11.4
通讯作者:
Young KH
Young KH
中科院分区:
医学1区
文献类型:
--
作者:
Xia Y;Xu-Monette ZY;Tzankov A;Li X;Manyam GC;Murty V;Bhagat G;Zhang S;Pasqualucci L;Visco C;Dybkaer K;Chiu A;Orazi A;Zu Y;Richards KL;Hsi ED;Choi WW;van Krieken JH;Huh J;Ponzoni M;Ferreri AJ;Møller MB;Parsons BM;Winter JN;Piris MA;Westin J;Fowler N;Miranda RN;Ok CY;Li Y;Li J;Medeiros LJ;Young KH

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PRDM1 /BLIMP-1 是浆细胞分化的主要调节因子,在活化 B 细胞样 (ABC) 弥漫性大 B 细胞淋巴瘤 (DLBCL) 患者中经常失活。人们对其遗传畸变和相关临床意义知之甚少。我们评估了一大群新发 DLBCL 患者的 PRDM1/BLIMP-1 缺失、突变和蛋白表达。 BLIMP-1 表达经常与 DLBCL 的 ABC 表型和浆母细胞形态亚型相关,但 63% 的 ABC-DLBCL 患者 BLIMP-1 蛋白表达呈阴性。在这些患者中,BLIMP-1 的缺失与 Myc 过度表达和 p53 通路肿瘤抑制分子表达减少有关。此外,我们发现外显子 1 和 2 内的纯合 PRDM1 缺失和 PRDM1 突变(编码对转录抑制至关重要的结构域)对 ABC-DLBCL 患者的预后影响较差,但对生发中心 B 细胞样 DLBCL 患者的预后影响较差。基因表达谱显示,PRDM1/BLIMP-1 表达的丧失与浆细胞分化特征的减少以及参与 B 细胞受体信号传导和肿瘤细胞增殖的基因的上调相关。总之,这些结果为 PRDM1/BLIMP-1 在 ABC-DLBCL 患者中的肿瘤抑制作用提供了临床和生物学见解,并表明 PRDM1/BLIMP-1 功能的丧失导致 ABC-DLBCL 患者的总体预后不良。
PRDM1 /BLIMP-1, a master regulator of plasma-cell differentiation, is frequently inactivated in activated B-cell-like (ABC) diffuse large B-cell lymphoma (DLBCL) patients. Little is known about its genetic aberrations and relevant clinical implications. We assessed a large cohort of patients with de novo DLBCL for PRDM1/BLIMP-1 deletion, mutation, and protein expression. BLIMP-1 expression was frequently associated with the ABC phenotype and plasmablastic morphologic subtype of DLBCL, yet 63% of the ABC-DLBCL patients were negative for BLIMP-1 protein expression. In these patients, loss of BLIMP-1 was associated with Myc overexpression and decreased expression of p53 pathway tumor-suppressor molecules. Also, we found that homozygous PRDM1 deletions and PRDM1 mutations within exons 1 and 2 which encode for domains crucial for transcriptional repression had a poor prognostic impact in patients with ABC-DLBCL but not those with germinal center B-cell-like DLBCL. Gene expression profiling revealed that loss of PRDM1/BLIMP-1 expression correlated with a decreased plasma-cell differentiation signature and upregulation of genes involved in B-cell receptor signaling and tumor-cell proliferation. In conclusion, these results provide clinical and biological insight into the tumor-suppressive role of PRDM1/BLIMP-1 in ABC-DLBCL patients and suggest that loss of PRDM1/BLIMP-1 function contributes to the overall poor prognosis of ABC-DLBCL patients.
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