Blood:Cirmtuzumab的抗慢性淋巴细胞白血病机制!

2019-08-14 MedSci MedSci原创

将Nurse样细胞(NLC)与慢性淋巴细胞白血病(CLL)细胞共培养,可诱导白血病细胞的STAT3磷酸化(pSTAT3),该过程可被抗Wnt5a抗体或抗ROR1 mAb cirmtuzumab阻断。研究表明Wnt5a可在30min内诱导NF-κB活化,但需要3个多小时来诱导pSTAT3。

中心点:

Nurse样细胞表达Wnt5a,诱导ROR1依赖性的NF-kB激活,导致CLL细胞中自分泌IL-6激活STAT3。

Cirmtuzumab抑制Wnt5a诱导的ROR1依赖性NF -kB激活,从而压制CLL细胞自分泌IL-6激活STAT3.

摘要:

将Nurse样细胞(NLC)与慢性淋巴细胞白血病(CLL)细胞共培养,可诱导白血病细胞的STAT3磷酸化(pSTAT3),该过程可被抗Wnt5a抗体或抗ROR1 mAb cirmtuzumab阻断。研究表明Wnt5a可在30min内诱导NF-κB活化,但需要3个多小时来诱导pSTAT3。

将分离的CLL细胞培养24小时发现Wnt5a会诱导IL-6、IL-8、CCL2、CCL4和CXCL1表达,这又反过来又可以在30分钟内诱导未受刺激CLL细胞发生pSTAT3。研究人员发现Wnt5a可诱导CLL细胞表达NF-κB的靶基因,包括IL-6,而且该效应可被cirmtuzumab或其他抑制NF-κB的药物阻断。

对来源于接受cirmtuzumab治疗的患者的CLL细胞和浆细胞进行检测发现,治疗后,在CLL细胞中,磷酸化的p65水平降低,以及NF-κB和STAT3靶基因的表达水平也降低,此外,浆细胞的IL-6水平也降低。

总的来说,本研究表明,Wnt5a/ROR1-依赖性信号有助于CLL细胞激活NF-κB,进而促进IL-6自分泌所诱导的pSTAT3激活。本研究表明cirmtuzumab可以抑制慢性淋巴细胞白血病患者的白血病细胞激活NF-κB和STAT3。

原始出处:

Yun Chen, et al.Cirmtuzumab Blocks Wnt5a/ROR1-Stimulation Of NF-κB To Repress Autocrine STAT3-Activation In Chronic Lymphocytic Leukemia. Blood 2019 :blood.2019001366; doi: https://doi.org/10.1182/blood.2019001366

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