Academy of Medical Sciences, Zhengzhou University, Zhengzhou 450052, China.
Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA.
Int J Mol Sci. 2022 Feb 4;23(3):1785. doi: 10.3390/ijms23031785.
Tyrosine kinase inhibitor (TKI) therapy has greatly improved lung cancer survival in patients with epidermal growth factor receptor (EGFR) mutations. However, the development of TKI-acquired resistance is the major problem to be overcome. In this study, we found that miR-196a expression was greatly induced in gefitinib-resistant lung cancer cells. To understand the role and mechanism of miR-196a in TKI resistance, we found that miR-196a-forced expression alone increased cell resistance to gefitinib treatment in vitro and in vivo by inducing cell proliferation and inhibiting cell apoptosis. We identified the transcription factor nuclear factor erythroid 2-related factor 2 (NRF2) bound to the promoter region of miR-196a and induced miR-196a expression at the transcriptional level. NRF2-forced expression also significantly increased expression levels of miR-196a, and was an upstream inducer of miR-196a to mediate gefitinib resistance. We also found that glycolipid transfer protein (GLTP) was a functional direct target of miR-196a, and downregulation of GLTP by miR-196a was responsible for gefitinib resistance. GLTP overexpression alone was sufficient to increase the sensitivity of lung cancer cells to gefitinib treatment. Our studies identified a new role and mechanism of NRF2/miR-196a/GLTP pathway in TKI resistance and lung tumor development, which may be used as a new biomarker (s) for TKI resistance or as a new therapeutic target in the future.
酪氨酸激酶抑制剂 (TKI) 治疗极大地改善了表皮生长因子受体 (EGFR) 突变的肺癌患者的生存。然而,TKI 获得性耐药的发展是需要克服的主要问题。在这项研究中,我们发现 miR-196a 在吉非替尼耐药肺癌细胞中表达显著上调。为了了解 miR-196a 在 TKI 耐药中的作用和机制,我们发现 miR-196a 的强制表达单独通过诱导细胞增殖和抑制细胞凋亡,在体外和体内增加了细胞对吉非替尼治疗的耐药性。我们确定了转录因子核因子红细胞 2 相关因子 2 (NRF2) 结合到 miR-196a 的启动子区域,并在转录水平诱导 miR-196a 的表达。NRF2 的强制表达也显著增加了 miR-196a 的表达水平,是 miR-196a 介导吉非替尼耐药的上游诱导物。我们还发现糖脂转移蛋白 (GLTP) 是 miR-196a 的功能直接靶标,miR-196a 的下调是对吉非替尼耐药的原因。GLTP 的单独过表达足以增加肺癌细胞对吉非替尼治疗的敏感性。我们的研究确定了 NRF2/miR-196a/GLTP 通路在 TKI 耐药和肺肿瘤发展中的新作用和机制,它可能作为 TKI 耐药的新生物标志物 (s) 或未来的新治疗靶点。
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