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Blood:前列腺素E2可恢复白血病细胞对糖皮质激素的敏感性

2020-08-13 MedSci原创 MedSci原创

糖皮质激素耐药仍是淋巴细胞恶性肿瘤治疗的一大挑战;本研究证明PGE2可增加cAMP,增强GC诱导性白血病细胞的死亡。

糖皮质激素(GC)耐药性仍然是儿童急性淋巴细胞白血病(ALL)的临床挑战,对GC的反应性是预后的可靠指标。为了明确GC耐药性通路,Roderic等在鼠急性T淋巴细胞白血病(T-ALL)细胞中进行了基于生存的全基因组shRNA筛选。

最终鉴定出了干扰cAMP信号传导,并且在GC耐药性或复发的ALL患者中表达下调的基因(在复发白血病患者中表达下调的基因有272个,在GC耐药性患者样本中表达显著下调的基因有369个)。

无论是在体内还是体外,沉默cAMP激活鸟嘌呤核苷酸结合蛋白(α刺激Gnas基因)均可干扰GC诱导性基因表达,导致地塞米松耐药。研究人员证实cAMP信号传导与地塞米松具有协同作用,可增加GC耐药性人T-ALL细胞的死亡。此外,研究人员还发现前列腺素E受体4在T-ALL样本中表达,并证明了前列腺素E2(PGE2)可增加胞内cAMP,强化GC诱导的基因表达,使人T-ALL样本对地塞米松敏感。

本研究结果提示,PGE2是使复发性儿童T-ALL对GC再敏感的靶标。

原始出处:

Justine Elizabeth Roderick,et al. Prostaglandin E2 stimulates cAMP signaling and re-sensitizes human leukemia cells to glucocorticoid-induced cell death. Blood. August 5,2020.

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    2020-08-14 ms3000000449926787

    学习一下

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