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Chloro and Bromo-Pyrazole Curcumin Knoevenagel Condensates augmented Anticancer activity against Human Cervical Cancer Cells: Design, Synthesis, In silico Docking and In Vitro Cytotoxicity Analysis.

With an endeavor to develop novel curcumin analogues as potential anti-cancer agents, we designed and synthesized a series of Knoevenagel condensates by clubbing pyrazole carbaldehydes at the active methylene carbon atom of the curcumin backbone. Molecular docking studies were carried out to target the proposed derivatives on human kinase β (IKKβ), a potential anti-cancer target. The chloro derivative displayed five hydrogen bond interactions with a docking score of -11.874 kcal/mol higher than curcumin (docking score =-7.434 kcal/mol). This was supported by the fact that the propellant shaped derivatives fitted aptly into the binding pocket. Molecular simulations studies were also conducted on the lead molecule and the results figured out that the stable complexes were developed as the minimal deviations per residue of protein within the range of 0.11 to 0.92 Å. The screened compounds were synthesized, characterized and evaluated in-vitro for cytotoxicity against cervical cancer cell line, HeLa using standard cell proliferation assay. Chloro derivative and bromo analog demonstrated IC50 (half maximal inhibitory concentration) value of 14.2-µg/ml and 18.6-µg/ml respectively significantly lower than 42.4-µg/ml of curcumin and higher than 0.008-µg/ml of paclitaxel. Induction of apoptosis was evaluated in the terms of cleavage of caspase-3 enzyme and they also exhibited 69.6% and 65.4% of apoptosis significantly higher than 19.9% induced by curcumin. In conclusion, chloro and bromo derivatives must be evaluated under a set of stringent in vitro and in vivo parameters for translating in to a clinically viable product.

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