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Updated: Jun 26, 2026

Synthesis and Bioconjugation of Thiol-Reactive Reagents for the Creation of Site-Selectively Modified Immunoconjugates
Published on: March 6, 2019
Design, Synthesis, and Biological Evaluation of New Potential Unusual Modified Anticancer Immunomodulators for
Reda R Mabrouk1,2, Abdallah E Abdallah1, Hazem A Mahdy1
1Pharmaceutical Medicinal Chemistry & Drug Design Department, Faculty of Pharmacy (Boys), Al-Azhar University, Cairo 11884, Egypt.
Abstract:
Sixteen new thalidomide analogs were synthesized. The new candidates showed potent in vitro antiproliferative activities against three human cancer cell lines, namely hepatocellular carcinoma (HepG-2), prostate cancer (PC3), and breast cancer (MCF-7). It was found that compounds XII, XIIIa, XIIIb, XIIIc, XIIId, XIVa, XIVb, and XIVc showed IC50 values ranging from 2.03 to 13.39 µg/mL, exhibiting higher activities than thalidomide against all tested cancer cell lines. Compound XIIIa was the most potent candidate, with an IC50 of 2.03 ± 0.11, 2.51 ± 0.2, and 0.82 ± 0.02 µg/mL compared to 11.26 ± 0.54, 14.58 ± 0.57, and 16.87 ± 0.7 µg/mL for thalidomide against HepG-2, PC3, and MCF-7 cells, respectively. Furthermore, compound XIVc reduced the expression of NFκB P65 levels in HepG-2 cells from 278.1 pg/mL to 63.1 pg/mL compared to 110.5 pg/mL for thalidomide. Moreover, compound XIVc induced an eightfold increase in caspase-8 levels with a simultaneous decrease in TNF-α and VEGF levels in HepG-2 cells. Additionally, compound XIVc induced apoptosis and cell cycle arrest. Our results reveal that the new candidates are potential anticancer candidates, particularly XIIIa and XIVc. Consequently, they should be considered for further evaluation for the development of new anticancer drugs.
Insights
Sixteen new thalidomide analogs show potent anticancer activity against liver, prostate, and breast cancer cells. Compounds XIIIa and XIVc demonstrate significant potential as novel drug candidates for cancer therapy.
Area of Science:
- Medicinal Chemistry
- Oncology
- Pharmacology
Background:
- Thalidomide analogs are investigated for anticancer properties.
- Existing cancer therapies require novel drug candidates with improved efficacy.
Purpose of the Study:
- To synthesize and evaluate novel thalidomide analogs for antiproliferative activity.
- To identify potent anticancer agents for further drug development.
Main Methods:
- Synthesis of sixteen new thalidomide analogs.
- In vitro antiproliferative assays against HepG-2, PC3, and MCF-7 cancer cell lines.
- Analysis of IC50 values, NFκB P65, caspase-8, TNF-α, and VEGF levels.
Main Results:
- Several analogs exhibited potent in vitro antiproliferative activities, outperforming thalidomide.
- Compound XIIIa showed the highest potency with low IC50 values across tested cell lines.
- Compound XIVc demonstrated significant reduction in NFκB P65, increased caspase-8, and decreased TNF-α and VEGF levels, inducing apoptosis and cell cycle arrest.
Conclusions:
- The synthesized thalidomide analogs, particularly XIIIa and XIVc, are promising anticancer candidates.
- Further evaluation of these compounds is warranted for the development of new anticancer drugs.
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