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Development of 3-phenyl-N-(2-(3-phenylureido)ethyl)-thiophene-2-sulfonamide Compounds as Inhibitors of Antiapoptotic Bcl-2 Family Proteins

Development of 3-phenyl-N-(2-(3-phenylureido)ethyl)-thiophene-2-sulfonamide Compounds as Inhibitors of Antiapoptotic Bcl-2 Family Proteins

Chengwen Yang, Sha Chen, Mi Zhou, Yan Li, Yangfeng Li, Zhengxi Zhang, Zhen Liu, Qian Ba, Jingquan Li, Hui Wang, Xiaomei Yan, Dawei Ma, Renxiao Wang

ChemMedChem. 2014 Jul;9(7):1436-52.

PMID: 24782462

Abstract:

Antiapoptotic Bcl-2 family proteins, such as Bcl-xL , Bcl-2, and Mcl-1, are often overexpressed in tumor cells, which contributes to tumor cell resistance to chemotherapies and radiotherapies. Inhibitors of these proteins thus have potential applications in cancer treatment. We discovered, through structure-based virtual screening, a lead compound with micromolar binding affinity to Mcl-1 (inhibition constant (Ki )=3 μM). It contains a phenyltetrazole and a hydrazinecarbothioamide moiety, and it represents a structural scaffold not observed among known Bcl-2 inhibitors. This work presents the structural optimization of this lead compound. By following the scaffold-hopping strategy, we have designed and synthesized a total of 82 compounds in three sets. All of the compounds were evaluated in a fluorescence-polarization binding assay to measure their binding affinities to Bcl-xL , Bcl-2, and Mcl-1. Some of the compounds with a 3-phenylthiophene-2-sulfonamide core moiety showed sub-micromolar binding affinities to Mcl-1 (Ki =0.3-0.4 μM) or Bcl-2 (Ki ≈1 μM). They also showed obvious cytotoxicity on tumor cells (IC50 <10 μM). Two-dimensional heteronuclear single quantum coherence NMR spectra of three selected compounds, that is, YCW-E5, YCW-E10, and YCW-E11, indicated that they bind to the BH3-binding groove on Bcl-xL in a similar mode to ABT-737. Several apoptotic assays conducted on HL-60 cells demonstrated that these compounds are able to induce cell apoptosis through the mitochondrial pathway. We propose that the compounds with the 3-phenylthiophene-2-sulfonamide core moiety are worth further optimization as effective apoptosis inducers with an interesting selectivity towards Mcl-1 and Bcl-2.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP2404877	3-Phenylthiophene		2404-87-7	Price

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