Modulation of DNA damage response by targeting ATM kinase using newly synthesized di-phenoxy acetamide (DPA) analogs to induce anti-neoplasia
作者:Fares Hezam Al-Ostoot、Ankith Sherapura、Vikas H. Malojirao、Prabhu Thirusangu、Tahani I. Al-Muhimeed、Shaukath Ara Khanum、B. T. Prabhakar
DOI:10.1007/s43440-021-00292-6
日期:2021.10
Imbalance and instability in the structure of the DNA have become major characteristics of cancer. In response to DNA damage, DNA damage response (DDR) protein, ataxia telangiectasia mutated (ATM), plays a pivotal role in the modulation of regulatory regions responsible for inhibition of apoptosis, thereby neoplastic progression. A new series of DPA (7a–t) were synthesized, characterized. Anti-proliferative studies to identify the lead compound were carried out by LDH and MTT assay. Apoptosis/DNA damage was measured through FACS, Annexin-v staining, TUNEL and Comet assay. Elucidation of molecular mechanism through immunoblot and further validation of the drug effect through in vivo approaches. Initial in vitro anti-proliferative screening of Compounds DPA (7a–t) against multiple cancer cell lines identified Compound DPA (7n) as a potent cytotoxic molecule with IC50 value of 4.3 μM. Down the line, in vitro and in vivo evaluation of Compound DPA (7n) inferred that it has apoptotic inducing potentiality. Further, evaluation of molecular mechanism inferred that Compound DPA (7n) effectively modulates ATM phosphorylation only, eventually altering downstream signalling pathways. Compound DPA (7n) emerged as a potent proapoptotic and anti-neoplastic agent by inhibiting ATM kinase activity both in vitro and in vivo. The conferring results ascertain that the drug could be developed as a new ATM kinase inhibitor with anti-cancer capacity.
DNA结构的失衡和不稳定性已成为癌症的主要特征。在应对DNA损伤时,DNA损伤反应(DDR)蛋白,共济失调毛细血管扩张突变(ATM)在调节负责抑制凋亡的调控区域中发挥着关键作用,从而促进肿瘤进展。合成了一系列新的DPA(7a–t)并进行了特征化。通过LDH和MTT assay进行抗增殖研究以鉴定先导化合物。通过FACS、 Annexin-v染色、TUNEL和Comet assay测量凋亡/DNA损伤。通过免疫印迹阐明分子机制,并通过体内方法进一步验证药物效果。对化合物DPA(7a–t)进行的初步体外抗增殖筛选针对多种癌细胞系,鉴定出化合物DPA(7n)为一种强效细胞毒性分子,其IC50值为4.3μM。通过化合物DPA(7n)的体外和体内评估推断其具有诱发凋亡的潜力。进一步评估分子机制推断化合物DPA(7n)仅有效地调节ATM磷酸化,最终改变下游信号传导途径。化合物DPA(7n)在体外和体内抑制ATM激酶活性,展现出强大的促凋亡和抗肿瘤特性。这些结果确认该药物可能被开发为具有抗癌能力的新型ATM激酶抑制剂。