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Blood:HLA-B-21二态性可决定急性髓系白血病免疫疗法的临床预后

2019-02-09 MedSci MedSci原创

NK细胞的功能受杀伤性免疫球蛋白样受体家族(KIRs)和NKG2A/CD94异二聚体这类的抑制性受体调孔。这些受体识别候选靶细胞上的I类HLA同源分子;最近有研究表明,在编码先导肽的基因片段中-21位置上的HLA-B的二态性决定了NK细胞的调控主要是依赖KIRs还是NKG2A/CD94受体。但HLA-B二态性对NK细胞介导的白血病细胞破坏或白血病进程的影响尚不明确。在本研究中,Alexander

NK细胞的功能受杀伤性免疫球蛋白样受体家族(KIRs)和NKG2A/CD94异二聚体这类的抑制性受体调孔。这些受体识别候选靶细胞上的I类HLA同源分子;最近有研究表明,在编码先导肽的基因片段中-21位置上的HLA-B的二态性决定了NK细胞的调控主要是依赖KIRs还是NKG2A/CD94受体。

但HLA-B二态性对NK细胞介导的白血病细胞破坏或白血病进程的影响尚不明确。在本研究中,Alexander Hallner等人通过IL2激活的NK细胞和急性髓系白血病(AML)患者的白血病细胞将携带HLA-B-21M或HLA-B-21T的个体的NK细胞的功能进行比较。

携带HLA-B-21M的受试者的NKG2A+ NK细胞发育的更好一些,并对KIR配体匹配的原发性白血病细胞具有更好的去颗粒降解颗粒的能力。

此外,研究人员还在IV期试验(患者接受以IL2为基础的免疫疗法)中评估了HLA-B-21突变对AML病程的潜在影响。结果显示HLA-B-21M或可提高NK细胞的功能;携带HLA-B-21M的患者的无白血病存活率和总体存活率均优于携带HLA-B-21T的患者。

因此,研究人员推断,HLA-B-21位点的遗传变异可能可以决定活化的NK细胞的抗白血病活性以及活化NK细胞的免疫疗法的临床疗效。


原始出处:

Alexander Hallner, et al. The HLA-B -21 dimorphism impacts on NK cell education and clinical outcome of immunotherapy in acute myeloid leukemia.Blood 2019 :blood-2018-09-874990; doi: https://doi.org/10.1182/blood-2018-09-874990 

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