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Updated: Sep 15, 2025

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
Published on: February 9, 2021
Synthesis and Anticancer Potential of New Benzimidazole Theranostic
Sahani Sandalima Uthumange1, Muhammad Azri Faiz Bin Abdul Zaki1, Keng Yoon Yeong1
1School of Science, Monash University Malaysia, Jalan Lagoon Selatan, 47500, Subang Jaya, Selangor, Malaysia.
Abstract:
A series of novel benzimidazole analogs is designed, synthesized, and screened against a panel of selected cancer cell lines, including H103 (oral squamous cell carcinoma, OSCC), H314 (OSCC), and HCT116 (colorectal carcinoma). Structural characterization of the compounds is successfully confirmed using nuclear magnetic resonance spectroscopy (1H and 13C) and liquid chromatography-mass spectrometry. Within the series, compound V7 emerged as a promising anticancer candidate, displaying broad-spectrum activity with high selectivity toward the tested cancer cell lines (half-maximal inhibitory concentration, IC50: H103 = 11.64 μM, H314 = 16.68 μM, HCT11 = 13.30 μM). Furthermore, the observed sirtuin 2 (SIRT2) inhibitory activity of V7 suggests a potential link to its anticancer effects. Molecular docking analysis reveals the importance of a hydroxyl group at the ortho position of the 2-phenyl ring in rendering SIRT2 inhibitory activity. Notably, the high autofluorescent properties of V7 (molar absorptivity ε = 34,477 M-1 cm-1, quantum yield Φ = 26%, and Stokes shift Δλ = 166 nm) indicate potential for further development as a theranostic agent for cancer.
Insights
Novel benzimidazole analogs show potent anticancer activity against oral and colorectal cancer cell lines. Compound V7, a promising candidate, also inhibits SIRT2 and exhibits theranostic potential due to its fluorescence.
Area of Science:
- Medicinal Chemistry
- Cancer Biology
- Biophysics
Background:
- Developing novel anticancer agents is crucial for treating oral squamous cell carcinoma (OSCC) and colorectal carcinoma.
- Benzimidazole derivatives have shown promise as therapeutic agents.
- Targeting sirtuin 2 (SIRT2) is a potential strategy for cancer therapy.
Purpose of the Study:
- To design, synthesize, and evaluate novel benzimidazole analogs for anticancer activity.
- To investigate the potential of these compounds as SIRT2 inhibitors.
- To explore the theranostic potential of promising candidates.
Main Methods:
- Synthesis of benzimidazole analogs.
- Screening against OSCC (H103, H314) and colorectal carcinoma (HCT116) cell lines.
- Structural characterization using NMR and LC-MS.
- SIRT2 inhibition assay and molecular docking.
- Fluorescence property analysis.
Main Results:
- Compound V7 demonstrated significant broad-spectrum anticancer activity with IC50 values in the low micromolar range.
- V7 exhibited potent SIRT2 inhibitory activity.
- Molecular docking indicated the importance of a hydroxyl group for SIRT2 inhibition.
- V7 possesses high autofluorescence, suggesting theranostic capabilities.
Conclusions:
- The synthesized benzimidazole analogs represent a promising class of anticancer agents.
- Compound V7 is a potent anticancer candidate with potential as a SIRT2 inhibitor.
- The autofluorescent properties of V7 open avenues for its development as a theranostic agent.
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