Blood:JAK2ex13InDel驱动成瘤转化,与慢性嗜酸性粒细胞白血病和真性红细胞增多症有关

2020-01-01 QQY MedSci原创

中心点:一种新的JAK2插入/缺失突变与嗜酸性粒细胞增多症和红细胞增多症有关,可能代表了一种新的临床实体。JAK2ex13InDel可在配体缺乏的情况下,通过β常见链受体导致组成性激活促进信号转导激活。摘要:Janus激酶2(JAK2)的JH2结构域的V617F突变是几种骨髓增值性肿瘤(MPNs)的致癌驱动突变,包括原发性血小板减少症、骨髓纤维化和真性红细胞增多(PV)。在MPNs中,还检测到JA

中心点:

一种新的JAK2插入/缺失突变与嗜酸性粒细胞增多症和红细胞增多症有关,可能代表了一种新的临床实体。

JAK2ex13InDel可在配体缺乏的情况下,通过β常见链受体导致组成性激活促进信号转导激活。

摘要:

Janus激酶2(JAK2)的JH2结构域的V617F突变是几种骨髓增值性肿瘤(MPNs)的致癌驱动突变,包括原发性血小板减少症、骨髓纤维化和真性红细胞增多(PV)。在MPNs中,还检测到JAK2的其他突变,最显著的是PV患者的12号外显子上的突变。

本文介绍了一种新的复发突变,即JAK2的JH2结构域内常见的4-氨基酸缺失和可变的1-氨基酸插入(Leu583-Ala586DelInsSer/Gln/Pro)。所有4位嗜酸性粒细胞增多症患者和2位携带Leu583-Ala586DelInsSer均符合PV和慢性嗜酸性白血病(CEL)的诊断标准。

功能性研究显示Leu583-Ala586DelInsSer(即JAK2ex13InDel)通过一种类似于JAK2V617F的机制解除对JAK2的调节,激活信号转导子、转录激活因子5和细胞外信号调节激酶,将亲代Ba/F3细胞转化为独立生长因子。与JAK2V617F相反,JAK2ex13InDel不需要一个外源的1型同源二聚体细胞因子受体来变换Ba/F3细胞,能够在缺乏配体的情况下,激活β常见链家族细胞因子受体(IL-3R、IL-5R和粒细胞-巨噬细胞集落刺激因子受体)信号,对IL-5R的影响最大,与嗜酸性粒细胞增多症的临床表型一致。

认识到这种新的PV/CEL重叠MPN具有重要的临床意义,因为PV和CEL患者都有很高的血栓形成风险,伴随的红细胞、中性粒细胞和嗜酸性粒细胞减少可能是预防血栓栓塞事件所必需的。对病因不明的嗜酸性粒细胞增多症患者髓系恶性肿瘤中复发性突变基因进行二代靶向测序或可揭示更多的Leu583-Ala586DelInsSer/Gln/Pro病例,使这种独特的MPN得以完整表征。

原始出处:

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    2020-01-03 xiaogang319
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    2020-01-03 gao_jian4220
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