Biological evaluations of newly-designed Pt(II) and Pd(II) complexes using spectroscopic and molecular docking approaches |
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| Authors: | Behafarid Ghalandari Atefeh Poursoleiman Mina Fekri Ali Komeili Adeleh Divsalar Mahboube Eslami Moghadam |
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| Affiliation: | 1. Department of Medical Nanotechnology, Applied Biophotonics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran;3. Faculty of Biological Sciences, Department of Cell and Molecular Biology? Kharazmi University, Tehran, Iran;4. Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran |
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| Abstract: | To perform biological evaluations of newly-designed Pt(II) and Pd(II) complexes, the present study was conducted with targeted protein human serum albumin (HSA) and HCT116 cell line as model of human colorectal carcinoma. The binding of Pt(II) and Pd(II) complexes to HSA was analyzed using fluorescence spectroscopy and molecular docking. The thermal stability and alterations in the secondary structure of HSA in the presence of Pt(II) and Pd(II) complexes were investigated using the thermal denaturation method and circular dichroism (CD) spectroscopy. The cytotoxicity of the Pt(II) and Pd(II) complexes was studied against the HCT116 cell line using MTT assay. The binding analysis revealed that the fluorescence findings were well in agreement with docking results such that there is only one binding site for each complex on HSA. Binding constants of 8.7?×?103 M?1, 2.65?×?103 M?1, 0.3?×?103 M?1, and 4.4?×?103 M?1 were determined for Pd(II) and Pt(II) complexes (I–IV) at temperature of 25?°C, respectively. Also, binding constants of 1.9?×?103 M?1, 15.17?×?103 M?1, 1.9?×?103 M?1, and 13.1?×?103 M?1 were determined for Pd(II) and Pt(II) complexes (I–IV) at temperature of 37?°C, respectively. The results of CD and thermal denaturation showed that the molecular structure of HSA affected by interaction with Pt(II) and Pd(II) complexes is stable. Cytotoxicity studies represented the growth suppression effect of the Pt(II) and Pd(II) complexes toward the human colorectal carcinoma cell line. Therefore, the results suggest that the new designed Pt(II) and Pd(II) complexes are well promising candidates for use in cancer treatment, particularly for human colorectal cancer. Communicated by Ramaswamy H. Sarma |
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| Keywords: | HSA Pt(II) complex Pd(II) complex binding analysis cytotoxicity |
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