The Curcumin Analogue 1,5-Bis(2-hydroxyphenyl)-1,4-pentadiene-3-one Induces Apoptosis and Downregulates E6 and E7 Oncogene Expression in HPV16 and HPV18-Infected Cervical Cancer Cells
作者:Felicia Paulraj、Faridah Abas、Nordin Lajis、Iekhsan Othman、Sharifah Hassan、Rakesh Naidu
DOI:10.3390/molecules200711830
日期:——
In an effort to study curcumin analogues as an alternative to improve the therapeutic efficacy of curcumin, we screened the cytotoxic potential of four diarylpentanoids using the HeLa and CaSki cervical cancer cell lines. Determination of their EC50 values indicated relatively higher potency of 1,5-bis(2-hydroxyphenyl)-1,4-pentadiene-3-one (MS17, 1.03 ± 0.5 μM; 2.6 ± 0.9 μM) and 1,5-bis(4-hydroxy-3-methoxyphenyl)-1,4-pentadiene-3-one (MS13, 2.8 ± 0.4; 6.7 ± 2.4 μM) in CaSki and HeLa, respectively, with significantly greater growth inhibition at 48 and 72 h of treatment compared to the other analogues or curcumin. Based on cytotoxic and anti-proliferative activity, MS17 was selected for comprehensive apoptotic studies. At 24 h of treatment, fluorescence microscopy detected that MS17-exposed cells exhibited significant morphological changes consistent with apoptosis, corroborated by an increase in nucleosomal enrichment due to DNA fragmentation in HeLa and CaSki cells and activation of caspase-3 activity in CaSki cells. Quantitative real-time PCR also detected significant down-regulation of HPV18- and HPV16-associated E6 and E7 oncogene expression following treatment. The overall data suggests that MS17 treatment has cytotoxic, anti-proliferative and apoptosis-inducing potential in HPV-positive cervical cancer cells. Furthermore, its role in down-regulation of HPV-associated oncogenes responsible for cancer progression merits further investigation into its chemotherapeutic role for cervical cancer.
为了研究姜黄素类似物作为提高姜黄素疗效的替代品,我们使用 HeLa 和 CaSki 宫颈癌细胞系筛选了四种双芳香族戊烷的细胞毒性潜力。EC50 值的测定表明,1,5-双(2-羟基苯基)-1,4-戊二烯-3-酮(MS17,1.03 ± 0.5 μM;2.6 ± 0.9 μM)和 1,5-双(4-羟基-3-甲氧基苯基)-1,4-戊二烯-3-酮(MS13,2.8 ± 0.4; 6.7 ± 2.4 μM),与其他类似物或姜黄素相比,它们在处理 48 和 72 h 时对 CaSki 和 HeLa 的生长抑制作用明显更大。基于细胞毒性和抗增殖活性,MS17 被选中进行全面的细胞凋亡研究。处理 24 小时后,荧光显微镜检测到暴露于 MS17 的细胞表现出与凋亡一致的显著形态学变化,HeLa 和 CaSki 细胞中 DNA 断裂导致的核小体富集增加以及 CaSki 细胞中 caspase-3 活性的激活也证实了这一点。定量实时 PCR 还检测到治疗后 HPV18 和 HPV16 相关 E6 和 E7 致癌基因的表达明显下调。总体数据表明,MS17 对 HPV 阳性宫颈癌细胞具有细胞毒性、抗增殖和诱导凋亡的潜力。此外,MS17 在下调导致癌症进展的 HPV 相关癌基因方面的作用值得进一步研究其对宫颈癌的化疗作用。