Blood:RhoA G17V突变可促进形成具有滤泡辅助T细胞特性的T细胞淋巴瘤

2018-05-17 MedSci MedSci原创

中心点:CD4+细胞表达RhoA G17V可导致细胞性和体液性自身免疫。表达RhoA G17V突变加上丧失Tet2表达,可诱导产生具有AITL特性的T细胞淋巴瘤。摘要:具有滤泡辅助T(TFH)细胞特性的血管免疫细胞性T细胞淋巴瘤(AITL)和其他外周T细胞淋巴瘤(PTCL)患者预后极差。这些淋巴瘤通常表现为癌旁自身免疫和淋巴细胞减少。60%的TFH样淋巴瘤患者携带RhoA G17V突变,但该突变在

中心点:

CD4+细胞表达RhoA G17V可导致细胞性和体液性自身免疫

表达RhoA G17V突变加上丧失Tet2表达,可诱导产生具有AITL特性的T细胞淋巴瘤

摘要:

具有滤泡辅助T(TFH)细胞特性的血管免疫细胞性T细胞淋巴瘤(AITL)和其他外周T细胞淋巴瘤(PTCL)患者预后极差。这些淋巴瘤通常表现为癌旁自身免疫和淋巴细胞减少。60%的TFH样淋巴瘤患者携带RhoA G17V突变,但该突变在肿瘤病理过程中的作用尚无了解。近日Blood杂志上发表一篇关于RhoA G17V突变在肿瘤发生中的作用的文章。

研究人员建立了表达RhoA G17V的转基因小鼠,RhoA G17V的表达受小鼠CD4调控元件控制,表达水平相当于杂合突变(tgRhoA小鼠)。

转基因小鼠的幼稚T细胞显著减少,但相对的TFH细胞数量增多。表达RhoA G17V的幼稚CD4 T细胞对T细胞受体刺激反应超敏。所有tgRhoA小鼠均会出现自身免疫病,包括野生型受体进行骨髓移植后重组的细胞浸润在耳朵和尾巴。

年龄较大的tgRhoA小鼠血清中抗双链DNA抗体滴度和肾脏免疫复合物沉积量均增加。RhoA G17V小鼠与Tet2fl/fl;Vav-Cre+小鼠杂交,可敲除造血室的Tet2、保留AITL的组织学和免疫表型、形成T细胞淋巴瘤,并且获得mTOR相关基因富集的转录特征。移植瘤对mTOR抑制剂依维莫司敏感,提示或可以RhoA G17V为治疗靶点。

综上所述,本研究数据提示RhoA G17V突变可促进在TFH淋巴瘤患者中所观察到的瘤性和癌旁表型。

原始出处:

Samuel Y. Ng, et al.RhoA G17V is sufficient to induce autoimmunity and promotes T cell lymphomagenesis in mice.Blood  2018  :blood-2017-11-818617;  doi: https://doi.org/10.1182/blood-2017-11-818617

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    2018-05-17 wqkm

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