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Synthesis and biological evaluation of novel pyrazole derivatives with anticancer activity
Alessandro Balbi1, Maria Anzaldi, Chiara Macciò
1Dipartimento di Scienze Farmaceutiche, Università degli Studi di Genova, V.le Benedetto XV 3, 16132 Genova, Italy. balbi@unige.it
Abstract:
We synthesized thirty-six novel pyrazole derivatives and studied their antiproliferative activity in human ovarian adenocarcinoma A2780 cells, human lung carcinoma A549 cells, and murine P388 leukemia cells. Four of these substances were selected because of their higher antiproliferative activity and further analyses showed that they were all able to induce apoptosis, although to a different extent. The expression of p53 and p21(waf1), which induce apoptosis and cell cycle arrest, was evaluated by western blot analysis in cells treated with compound 12d. The analysis of the cell cycle showed that all the selected compounds cause a partial G2/M block and the formation of polyploid cells. Furthermore, the four selected compounds were tested for their interaction with the microtubular cytoskeletal system by docking analysis, tubulin polymerization assay and immunofluorescence staining, demonstrating that the compound 12d, unlike the other active derivatives, was able to significantly bind dimers of α- and β-tubulin, probably causing a molecular distortion resulting in the disassembly of microtubules.
Insights
Novel pyrazole derivatives show antiproliferative effects by inducing apoptosis and cell cycle arrest. Compound 12d uniquely targets tubulin, disrupting microtubule assembly in cancer cells.
Area of Science:
- Medicinal Chemistry
- Molecular Biology
- Cancer Research
Background:
- Pyrazole derivatives are recognized for their diverse biological activities.
- Anticancer drug discovery requires novel compounds targeting cellular mechanisms.
- Understanding drug-target interactions is crucial for developing effective cancer therapies.
Purpose of the Study:
- To synthesize and evaluate novel pyrazole derivatives for antiproliferative activity against cancer cell lines.
- To investigate the mechanism of action of active compounds, including apoptosis induction and cell cycle effects.
- To explore the interaction of these compounds with the microtubular cytoskeleton.
Main Methods:
- Synthesis of 36 novel pyrazole derivatives.
- Antiproliferative assays using human ovarian adenocarcinoma (A2780), human lung carcinoma (A549), and murine P388 leukemia cells.
- Apoptosis induction analysis, Western blot for p53 and p21(waf1) expression, cell cycle analysis (G2/M block, polyploidy).
- Molecular docking, tubulin polymerization assay, and immunofluorescence staining to assess microtubule interaction.
Main Results:
- Four pyrazole derivatives exhibited significant antiproliferative activity.
- All selected compounds induced apoptosis to varying degrees.
- Compounds caused partial G2/M cell cycle arrest and polyploid cell formation.
- Compound 12d demonstrated specific binding to α- and β-tubulin dimers, leading to microtubule disassembly, unlike other active derivatives.
Conclusions:
- Novel pyrazole derivatives possess potent antiproliferative and apoptosis-inducing properties.
- The mechanism involves cell cycle arrest and microtubule disruption.
- Compound 12d's unique interaction with tubulin offers a potential new avenue for anticancer drug development targeting microtubules.
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