Generation and control of metastasis in experimental tumor systems; inhibition of experimental metastases by a tilorone analogue

✍ Scribed by Ignacio Algarra; Matías Pérez; Federico Garrido; Jose Juan Gaforio; Petter Höglund; Hans-Gustaf Ljunggren

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: French
• Weight: 672 KB
• Volume: 54
• Category: Article
• ISSN: 0020-7136
• DOI: 10.1002/ijc.2910540327

✦ Synopsis

The role of the chemical compound RMI 10,874DA (3,6-bis[2-(dimethylamino)-ethoxyll-9H-xanthene-9-one dihydrochloride) in the abrogation of the metastatic spread of tumor cells was studied. Pre-treatment of BALB/c mice with the RMI 10,874DA compound (referred to below as tilorone analogue) completely eliminated lung colonization of an H-2-negative (GR9.B9) MCAinduced fibrosarcoma clone in an experimental metastasis assay. Other murine tumors, including H-2-positive and H-2negative chemically induced fibrosarcoma clones and B 16 melanoma, were also sensitive to the treatment; orally administered tilorone analogue given one day before the i.v. injection of tumor cells markedly inhibited lung colonization. The effect was not due to direct toxicity of tilorone analogue on tumor cells, but instead it was dependent on N K cells; this was suggested by the finding that anti-asialo GM, treatment of mice abrogated the effect of tilorone analogue. Kinetic studies of splenic N K activity in tilorone-treated mice showed a rapid boosting of NK-cell activity, the greatest stimulation occurring the day before removal of splenocytes for 51Cr-release assay against YAC-I target cells. These kinetics correlated with the inhibition of in vivo lung colonization after tilorone analogue treatment. Inhibition of experimental tumor metastasis was dose-dependent and was observed when animals were treated the day before or the day after tumor-cell injection. Furthermore, repeated treatment of mice with this tilorone analogue significantly reduced lung colonization.