title: Antineoplastic agents. 445. Synthesis and evaluation of structural modifications of (Z)- and (E)-combretastatin A-41.
abstract: A series of cis- and trans-stilbenes related to combretastatin A-4 (1a), with a variety of substituents at the 3'-position of the aryl B-ring, were synthesized and evaluated for inhibitory activity employing six human cancer cell lines (NCI-H460 lung carcinoma, BXPC-3 pancreas, SK-N-SH neuroblastoma, SW1736 thyroid, DU-145 prostate, and FADU pharynx-squamous sarcoma) as well as the P-388 murine lymphocyte leukemia cell line. Several of the cis-stilbene derivatives were significantly inhibitory against all cell lines used, with potencies comparable to that of the parent 1a. All were potent inhibitors of tubulin polymerization. The corresponding trans-stilbenes had little or no activity as tubulin polymerization inhibitors and were relatively inactive against the seven cancer cell lines. In terms of inhibition of both cancer cell growth and tubulin polymerization, the dimethylamino and bromo cis-stilbenes were the most potent of the new derivatives, the latter having biological activity approaching that of 1a. As part of the present study, the X-ray crystal structure of the 3'-O-phosphate of combretastatin A-4 (1b) was successfully elucidated. Compound 1b has been termed the "combretastatin A-4 prodrug", and it is currently undergoing clinical trials for the treatment of human cancer patients.
authors.affiliation: Department of Chemistry, Arizona State University, Tempe, 85287-2404, USA.
authors.forename: George R
authors.initials: GR
authors.lastname: Pettit
authors.forename: Monte R
authors.initials: MR
authors.lastname: Rhodes
authors.forename: Delbert L
authors.initials: DL
authors.lastname: Herald
authors.forename: Ernest
authors.initials: E
authors.lastname: Hamel
authors.forename: Jean M
authors.initials: JM
authors.lastname: Schmidt
authors.forename: Robin K
authors.initials: RK
authors.lastname: Pettit
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D001704:Biopolymers; D045744:Cell Line, Tumor; D015169:Colony Count, Microbial; D018360:Crystallography, X-Ray; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D051379:Mice; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D013237:Stereoisomerism; D013267:Stilbenes / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D014404:Tubulin / Q000737:chemistry
chemical_list: D000890:Anti-Infective Agents; D000970:Antineoplastic Agents; D001704:Biopolymers; D013267:Stilbenes; D014404:Tubulin; C058728:fosbretabulin