SYK inhibition modulates distinct PI3K/AKT- dependent survival pathways and cholesterol biosynthesis in diffuse large B cell lymphomas.

SYK inhibition modulates distinct PI3K/AKT- dependent survival pathways and cholesterol biosynthesis in diffuse large B cell lymphomas.
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DOI:
10.1016/j.ccr.2013.05.002
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发表时间:
2013-06-10
期刊:
影响因子:
50.3
通讯作者:
Shipp MA
Shipp MA
中科院分区:
医学1区
文献类型:
--
作者:
Chen L;Monti S;Juszczynski P;Ouyang J;Chapuy B;Neuberg D;Doench JG;Bogusz AM;Habermann TM;Dogan A;Witzig TE;Kutok JL;Rodig SJ;Golub T;Shipp MA

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B细胞受体(BCR)信号通路组分代表弥漫性大B细胞淋巴瘤(DLBCL)和其他B细胞肿瘤的有希望的治疗靶点。BCR信号转导激活脾酪氨酸激酶(SYK)和下游途径,包括PI 3 K/AKT和NF-κB。在以前的研究中,化学SYK阻断选择性地降低BCR信号传导并诱导BCR依赖性DLBCL的凋亡。在此,我们描述了具有高或低基线NF-κB活性的DLBCL中不同的SYK/PI 3 K依赖性存活途径,包括选择性抑制NF-κ B低肿瘤中促凋亡HRK蛋白。我们还将SYK/PI 3 K依赖性胆固醇生物合成定义为在具有低或高NF-κB的DLBCL中维持脂筏中BCR完整性的前馈机制。此外,SYK扩增和PTEN缺失被鉴定为原发性“BCR”型DLBCL中的选择性遗传改变。
B-cell receptor (BCR) signaling pathway components represent promising treatment targets in diffuse large B-cell lymphoma (DLBCL) and additional B-cell tumors. BCR signaling activates spleen tyrosine kinase (SYK) and downstream pathways including PI3K/AKT and NF-κB. In previous studies, chemical SYK blockade selectively decreased BCR signaling and induced apoptosis of BCR-dependent DLBCLs. Herein, we characterize distinct SYK/PI3K-dependent survival pathways in DLBCLs with high or low baseline NF-κB activity including selective repression of the pro-apoptotic HRK protein in NF-κB-low tumors. We also define SYK/PI3K-dependent cholesterol biosynthesis as a feed-forward mechanism of maintaining the integrity of BCRs in lipid rafts in DLBCLs with low or high NF-κB. In addition, SYK amplification and PTEN deletion are identified as selective genetic alterations in primary “BCR”-type DLBCLs.
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