Elucidation of the interaction of apocarotenoids with calf thymus DNA by biophysical techniques and in vitro study in MCF-7 cells to explore their potential in cancer therapy

Document Type : Original Article

Authors

School of BioSciences and Technology, Vellore Institute of Technology (VIT), Vellore 632014, Tamil Nadu, India

Abstract

Objective(s): DNA is one of the targets of cancer-therapeutic small molecules. Cisplatin, a DNA intercalator, is one of the first-line drugs in the cancer chemo regimen which comes with health-compromising side effects during chemotherapy. The synergistic effect of natural molecules with cisplatin can help to potentiate its anti-cancer efficacy and decrease its negative effect on health. Here, we report the interaction of cisplatin with calf thymus-DNA (ct-DNA) in combination with natural molecules like apocarotenoids which are reported for their therapeutic properties.
Materials and Methods: The combinatorial effect of apocarotenoids on ct-DNA was explored through various biophysical techniques such as UV-Visible spectroscopy, circular dichroism studies, DNA melt curve analysis, viscosity measurements, and an in vitro study in MCF-7 cells by cell cycle analysis.
Results: UV-Visible spectroscopy studies suggest apocarotenoids and their combination shows a non-intercalative mode of binding. Circular dichroism analysis showed no major changes in DNA form during the interaction of DNA with apocarotenoids and their respective combinations with cisplatin, which is suggestive of the groove-binding mode of apocarotenoids. DNA melt curve analysis showed a decrease in the intensity of the fluorescence for apocarotenoids with cisplatin which indicates the possibility of DNA interaction through groove binding. Viscosity studies suggested a groove binding mode of interaction of ct-DNA with apocarotenoids and their combination as there was minimal change in the viscosity measurements. The in vitro analysis exhibits that the apocarotenoids and their combination have a considerable effect on DNA synthesis.
Conclusion: This study provides a better perspective on the possible mode of interaction between ct-DNA and natural molecules along with cisplatin.

Keywords

Main Subjects

References

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Iranian Journal of Basic Medical Sciences
Volume 26, Issue 9
September 2023
Pages 1083-1089

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