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Generation and control of metastasis in experimental tumor systems; inhibition of experimental metastases by a tilorone analogue
Author(s) -
Algarra Ignacio,
Pérez Matías,
Garrido Federico,
Gaforio Jose Juan,
Höglund Petter,
Ljunggren HansGustaf
Publication year - 1993
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.2910540327
Subject(s) - fibrosarcoma , in vivo , metastasis , cancer research , splenocyte , melanoma , medicine , in vitro , pharmacology , chemistry , biology , spleen , immunology , pathology , cancer , biochemistry , microbiology and biotechnology
The role of the chemical compound RMI 10,874DA (3,6‐bis[2‐(dimethylamino)‐ethoxyl]‐9H‐xanthene‐9‐onedihydrochloride) 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) MCA‐induced fibrosarcoma clone in an experimental metastasis assay. Other murine tumors, including H‐2‐positive and H‐2‐negative chemically induced fibrosarcoma clones and B16 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 NK cells; this was suggested by the finding that anti‐asialo GM 1 treatment of mice abrogated the effect of tilorone analogue. Kinetic studies of splenic NK activity in tilorone‐treated mice showed a rapid boosting of NK‐cell activity, the greatest stimulation occurring the day before removal of splenocytes for 51 Cr‐release assay against YAC‐1 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.