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Blood:RAC2显性突变导致淋巴细胞减少、免疫缺陷

2019-02-06 MedSci MedSci原创

中心点:E62K,是小GTP激酶(RAC2)的显性激活性突变;RAC2[E62K]患者具有淋巴细胞和骨髓缺陷。Rac2+/E62K小鼠具有T/B淋巴细胞减少、中性粒细胞F-肌动蛋白增多以及过氧化物合成过量的表现。摘要:RAC2,与NADPH的p67phox相互作用可激活中性粒细胞合成过氧化物,与p21-活化激酶(PAK1)相互作用对fMLF-诱导的肌动蛋白重塑必不可少。Amy P. Hsu等人员发

中心点:

E62K,是小GTP激酶(RAC2)的显性激活性突变;RAC2[E62K]患者具有淋巴细胞和骨髓缺陷。

Rac2+/E62K小鼠具有T/B淋巴细胞减少、中性粒细胞F-肌动蛋白增多以及过氧化物合成过量的表现。

摘要:

RAC2,与NADPH的p67phox相互作用可激活中性粒细胞合成过氧化物,与p21-活化激酶(PAK1)相互作用对fMLF-诱导的肌动蛋白重塑必不可少。

Amy P. Hsu等人员发现了3例携带RAC2[E62K]新发突变的患者,该突变可导致严重的T/B淋巴细胞减少、骨髓功能障碍和复发性的呼吸道感染。RAC2[E62K]患者的中性粒细胞过氧化物合成过量、fMLF导向的趋药性受损、大胞饮异常。

转染RAC2[E62K]的细胞株表现出活性GTP结合RAC2的特征,包括过氧化物生成和膜皱折增多。进一步研究发现RAC2[E62K]仍具有GTP水解活性,但GTPase激活蛋白(GAP)不能加速水解,导致GTP结合RAC2活性时间延长。Rac2+/E62K小鼠也具有在患者中所见到的T/B淋巴细胞减少、中性粒细胞F-肌动蛋白增多以及华氧化物合成过量的表现。

该获得性突变的功能突出了RAC2在造血干细胞中具有一种特殊的、非冗余的功能,且可借此将RAC2与普遍存在的RAC1区分开来。


原始出处:

Amy P. Hsu,et al. Dominant activating RAC2 mutation with lymphopenia, immunodeficiency and cytoskeletal defects. Blood 2019 :blood-2018-11-886028; doi: https://doi.org/10.1182/blood-2018-11-886028 

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    2019-02-06 Dans.ru

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    2019-02-06 Dans.ru

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