Blood:肿瘤相关髓细胞为T-ALL提供重要支持

2020-07-16 医刀 MedSci原创

耗竭髓细胞亚群可缓解多个器官的白血病负担,延长T-ALL小鼠存活期;人髓细胞可促进患者T-ALL细胞存活,富集的巨噬细胞基因特征与患者预后不良相关。

尽管在致癌基因和抑癌基因中存在促进癌症生长的突变,但急性T淋巴细胞白血病(T-ALL)细胞仍需要外源细胞或信号才能在体外培养中存活。Lyu等既往发现来自胸腺肿瘤微环境(TME)的髓细胞,特别是树突状细胞(DC),可支持体外原代小鼠T-ALL细胞的存活和增殖。因此,其假设肿瘤相关髓细胞在体内也可支持T-ALL。

与这种可能性一致,在两种不同的T-ALL小鼠模型中,耗竭体内髓细胞可显著降低多器官中的白血病负担,并延长小鼠的生存期。髓室对T-ALL生长的影响不依赖于抗肿瘤T细胞反应的抑制。相反,髓细胞是提供直接支持T-ALL细胞的信号。

转录谱分析、功能测定和急性体内髓细胞耗竭等实验共同确定了IGF1R激活是髓细胞介导的T-ALL生长和存活的关键组成部分。研究人员还确定了几个具有直接支持T-ALL细胞生存能力的髓系亚群。

与在小鼠模型上的结果一致,源自人外周血单核细胞的髓样细胞激活了IGF1R,并直接支持原发性患者T-ALL细胞的体外存活。此外,已发表的临床样品中富集的巨噬细胞基因标记与儿科T-ALL患者的不良预后相关。

总而言之,这些数据表明肿瘤相关髓细胞提供了T-ALL在多个器官中生长的重要信号,提示肿瘤相关髓细胞和相关信号或可作为潜在的治疗靶标。

原始出处:

Aram Lyu,et al. Tumor-associated myeloid cells provide critical support for T-ALL. Blood. July 07,2020.

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    2020-07-18 膀胱癌
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    2020-07-18 紫砂壶
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    2020-07-18 chengjn

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