MDL-800, an allosteric activator of SIRT6, suppresses proliferation and enhances EGFR-TKIs therapy in non-small cell lung cancer
作者:Jia-lin Shang、Shao-bo Ning、Ying-yi Chen、Tian-xiang Chen、Jian Zhang
DOI:10.1038/s41401-020-0442-2
日期:2021.1
Sirtuin 6 (SIRT6), a member of the sirtuin family, is a nicotinamide adenine dinucleotide (NAD+)-dependent deacetylase that is involved in various physiological and pathological processes. SIRT6 is generally downregulated and linked to tumorigenesis in non-small cell lung carcinoma (NSCLC), thus regarded as a promising therapeutic target of NSCLC. In this study, we investigated whether MDL-800, an allosteric activator of SIRT6, exerted antiproliferation effect against NSCLC cells in vitro and in vivo. We showed that MDL-800 increased SIRT6 deacetylase activity with an EC50 value of 11.0â±â0.3âμM; MDL-800 (10â50âμM) induced dose-dependent deacetylation of histone H3 in 12 NSCLC cell lines. Treatment with MDL-800 dose dependently inhibited the proliferation of 12 NSCLC cell lines with IC50 values ranging from 21.5 to 34.5âμM. The antiproliferation effect of MDL-800 was significantly diminished by SIRT6 knockout. Treatment with MDL-800 induced remarkable cell cycle arrest at the G0/G1 phase in NSCLC HCC827 and PC9 cells. Furthermore, MDL-800 (25, 50âμM) enhanced the antiproliferation of epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) in osimertinib-resistant HCC827 and PC9 cells as well as in patient-derived primary tumor cells, and suppressed mitogen-activated protein kinase (MAPK) pathway. In HCC827 cell-derived xenograft nude mice, intraperitoneal administration of MDL-800 (80âmgâ·âkgâ1â·âdâ1, for 14 days) markedly suppressed the tumor growth, accompanied by enhanced SIRT6-dependent histone H3 deacetylation and decreased p-MEK and p-ERK in tumor tissues. Our results provide the pharmacological evidence for future clinical investigation of MDL-800 as a promising lead compound for NSCLC treatment alone or in combination with EGFR-TKIs.
Sirtuin 6(SIRT6)是去乙酰化酶家族的一个成员,依赖于烟酰胺腺嘌呤二核苷酸(NAD+)的去乙酰化酶,参与多种生理和病理过程。SIRT6通常下调,与非小细胞肺癌(NSCLC)的肿瘤发生相关,因此被视为NSCLC的一个有前景的治疗靶点。在本研究中,我们探讨了MMRL-800作为SIRT6的变构激活剂,是否在体外和体内对NSCLC细胞具有抗增殖作用。我们发现MDL-800提高了SIRT6去乙酰化酶活性,EC50值为11.0±0.3μM;MDL-800(10-50μM)在12个NSCLC细胞系中诱导了剂量依赖性的组蛋白H3去乙酰化。MDL-800的处理剂量依赖性地抑制了12个NSCLC细胞系的增殖,IC50值范围为21.5至34.5μM。SIRT6的敲除显著减弱了MDL-800的抗增殖效应。MDL-800处理导致NSCLC HCC827和PC9细胞在G0/G1期发生显著的细胞周期停滞。此外,MDL-800(25、50μM)增强了表皮生长因子受体酪氨酸激酶抑制剂(EGFR-TKIs)在抗奥希替尼的HCC827和PC9细胞以及患者来源的原代肿瘤细胞中的抗增殖作用,并抑制了有丝分裂激活蛋白激酶(MAPK)通路。在HCC827细胞来源的异种移植裸鼠中,腹腔给药MDL-800(80mg·kg^-1·d^-1,持续14天)显著抑制了肿瘤生长,并伴随着SIRT6依赖的组蛋白H3去乙酰化的增强及肿瘤组织中p-MEK和p-ERK的减少。我们的结果为未来MDL-800作为NSCLC单独治疗或与EGFR-TKIs联合使用的潜在临床研究提供了药理学依据。