3-(Iodoacetamido)-benzoylurea: A novel cancericidal tubulin ligand that inhibits microtubule polymerization, phosphorylates bcl-2, and induces apoptosis in tumor cells

Jian Dong Jiang, Ashley S. Davis, Kim Middleton, Yi He Ling, Roman Perez-Soler, James F. Holland, J. George Bekesi

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Abstract

3-(Iodoacetamido)-benzoylurea (3-IAABU) is a newly synthesized anti- tubulin compound with a molecular weight of 347. 3-IAABU exhibited anticancer activity in a variety of tumor cell lines with ID90 in the range of 0.015- 0.29 μM for leukemic cells and 0.06-0.92 μM for solid tumors. Higher selectivity against malignant cells was observed with 3-IAABU than that with vinblastine and paclitaxel. It inhibits microtubule assembly in tubulin systems either with or without microtubule-associated proteins (ID50 was 0.1 μM and 1.2 μM, respectively) and microtubule depolymerization was not affected, indicating an inhibition of polymerization by binding of 3-IAABU to the heterodimeric subunit of tubulin. 3-IAABU was shown to inhibit the binding of colchicine, a subunit binding compound, but did not inhibit binding of vinblastine and guanosine 5'-triphosphate/guanosine 5'- diphosphate, indicating that colchicine site corresponds to the site that 3- IAABU locates. Tumor cells treated with 3-IAABU showed scattered chromosomes in metaphase. Normal microtubule architecture or spindle apparatus was absent in these cells; instead, punctuated aggregates of tubulin were found by an immunofluorescent staining. Cell cycle analyses showed an accumulation of tumor cells at M phase after a 4-h treatment with 3-IAABU. The phosphorylated bcl-2 representative of an inactivated form of the oncoprotein was found in the cells 12 h after treatment with 3-IAABU. These cells progressed to apoptosis within 16 h. As a new tubulin ligand, 3-IAABU could be a promising agent in cancer chemotherapy.

Original languageEnglish (US)
Pages (from-to)5389-5395
Number of pages7
JournalCancer Research
Volume58
Issue number23
Publication statusPublished - Dec 1 1998
Externally publishedYes

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ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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