Preclinical analysis of tasidotin HCl in Ewing's sarcoma, rhabdomyosarcoma, synovial sarcoma, and osteosarcoma

Vaani Garg, Wendong Zhang, Pooja Gidwani, Mimi Kim, E. Anders Kolb

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Purpose: Dolastatins are a group of structurally unique peptides originally isolated from a sea hare, Dolabella auricularia, which seem to inhibit tubulin polymerization and mitosis. Tasidotin hydrochloride (tasidotin), a novel synthetic analogue of dolastatin 15, is evaluated in preclinical models of pediatric tumors. Experimental Design: The cytotoxicity of tasidotin was evaluated in a panel of pediatric sarcoma cell lines in vitro and in vivo. Results: The IC50 in Ewing's sarcoma, rhabdomyosarcoma, osteosarcoma, and synovial sarcoma lines ranged from 0.002 μ to 0.32 μmol/L. In the SK-ES1 and RH30 cell lines, tasidotin induced a G2-M arrest that persisted for 48 h after the drug was washed from the cells. In vitro, more than half the cells were in the early or late phase of apoptosis 48 h after treatment with tasidotin. In vivo, a significant increase in apoptotic nuclei was apparent in xenograft tumors harvested within 24 h after a 5-day course of tasidotin. In vivo response was determined in severe combined immunodeficient xenograft models of pediatric sarcomas implanted heterotopically. Significant antitumor activity was observed in all tumor lines tested. A complete response was observed in 2 synovial sarcoma lines, 1 osteosarcoma line, 1 rhabdomyosarcoma line, and 1 Ewing's sarcoma line. A partial response was observed in 1 rhabdomyosarcoma and 1 Ewing's sarcoma. Conclusions: Tasidotin induces a G2-M block in treated cells ultimately resulting in apoptosis. Antitumor activity is confirmed in vivo in preclinical xenograft models of pediatric sarcomas.

Original languageEnglish (US)
Pages (from-to)5446-5454
Number of pages9
JournalClinical Cancer Research
Volume13
Issue number18
DOIs
StatePublished - Sep 15 2007

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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