Citation: GAO Yunyan, CAI Wenjiao, OU Zhize, MA Tuotuo, YI Na, LI Zhiyuan. DNA Interactions and Cytotoxicity of Imidazole-Modified Naphthalimides[J]. Acta Physico-Chimica Sinica, ;2019, 35(2): 230-240. doi: 10.3866/PKU.WHXB201711281 shu

DNA Interactions and Cytotoxicity of Imidazole-Modified Naphthalimides

The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an 710072, P. R. China

Corresponding author: OU Zhize, ouzhize@nwpu.edu.cn
Received Date: 30 October 2017
Revised Date: 21 November 2017
Accepted Date: 21 November 2017
Available Online: 28 February 2017
Fund Project: the Natural Science Foundation of Shaanxi Province, China 2016JM2013The project was supported by the Natural Science Foundation of Shaanxi Province, China (2016JM2013), the National Natural Science Foundation of China (21073143), and the NPU Foundation for Graduate Innovation (Z2017208)the NPU Foundation for Graduate Innovation Z2017208the National Natural Science Foundation of China 21073143

The rational design of naphthalimide derivatives, which can target specific DNA sequences and secondary structural DNA, is important for developing potential anticancer drugs. In this work, the naphthalimide-imidazole conjugate (3) and its alkylated derivatives (4a–c) were synthesized, and characterized by ¹H NMR, ¹³C NMR, and mass spectrometry (MS). The interactions of these compounds with calf thymus DNA (CT DNA) and G-quadruplex DNA were investigated by UV-Vis spectroscopy, fluorescence spectroscopy, circular dichroism, and fluorescence resonance energy transfer (FRET). The studies revealed that the naphthalimides with imidazolium displayed higher affinity towards CT DNA than those with the imidazole moiety, suggesting that the electrostatic interaction plays an important role in the interactions between the naphthalimide and the DNA duplex. All of the obtained naphthalimide derivatives possessed high affinity (K_a > 4 × 10⁶ L·mol^-1) towards the telomeric G-quadruplex, and exhibited more than 30-fold selectivity for the quadruplex versus CT DNA. The viscosity of CT DNA increased upon addition of the naphthalimides, suggesting that the latter could bind to the former via a classical intercalation mode. FRET results indicated that the compounds 3 and 4a–c stabilized the structure of the telomeric G-quadruplex by increasing its melting temperature by 5.8, 10.7, 8.4, and 7.8 ℃, respectively. CD spectral results suggested that the telomeric G-quadruplex maintained a mixture of antiparallel and parallel conformation in the presence of the naphthalimide derivatives (3 and 4a–c) in a buffer containing K⁺. The fluorescence intensity of the naphthalimide derivatives 3 and 4a, b with octylimidazolium was significantly enhanced upon interaction with the G-quadruplex, which could be attributed to the immersion of naphthalimide moieties in the hydrophobic region of the G-quadruplex. However, the fluorescence of compound 4c with hexadecylimidazolium increased only slightly upon addition of the G-quadruplex. Molecular docking studies indicated that the naphthalimide derivatives were associated with the loop and groove of the human telomeric G-quadruplex via hydrophobic interactions. A hydrogen bond was formed between the imidazole group in compound 3 and the guanine residue DG16. The phosphate group from the G-quadruplex backbone pointed to the imidazolium moiety of 4a–c, suggesting that the electrostatic interactions also played an important role. Being fluorescent, the cellular localization of 3 and 4a–c could be conveniently tracked by fluorescence imaging. The results showed that compounds 4a–c, which contained the imidazolium moiety, were mainly localized in the nucleus after 4.0 h of incubation, while compound 3 with the imidazole moiety was partially localized in the nucleus. The enhancement of the nuclear localization of 4a–c may be attributed to the positive charge in 4a–c and their higher DNA affinity. Based on the MTT assay results, it was concluded that compounds 4a–c displayed much stronger cytotoxic activity against breast cancer cells than 3. Furthermore, compounds 4a and 4b selectively inhibited the A549 cells over normal human lung fibroblast MRC-5 cells, with high anticancer activity. These results indicated that the G-quadruplex binding affinity and anticancer activity of naphthalimide could be modulated by conjugation with the imidazole moiety.
- Naphthalimide,
- G-quadruplex,
- Anticancer drug,
- Imidazolium,
- Cytotoxicity
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沈阳化工大学材料科学与工程学院沈阳 110142