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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1984 Jun;81(11):3389–3393. doi: 10.1073/pnas.81.11.3389

Induction of the metastatic phenotype in a mouse tumor model by 5-azacytidine, and characterization of an antigen associated with metastatic activity.

L Olsson, J Forchhammer
PMCID: PMC345513  PMID: 6203119

Abstract

The murine Lewis lung carcinoma is a long-term grafted tumor that, after subcutaneous inoculation, forms metastases to the lungs. Forty-two cell lines were established from a primary tumor site and 40 were established from lung metastatic foci. Cloned sublines were established from the original 82 lines, and 2 sublines among 405 were found to be tumorigenic but not metastatic (T+/M-), whereas the remaining 403 sublines were both tumorigenic and metastatic (T+/M+). The T+/M- phenotype was shown to be stable for greater than 2 yr. However, treatment of the T+/M- cell lines for 3 days with 3 microM 5-azacytidine resulted in reexpression of the metastatic phenotype in otherwise stable T+/M- lines. Also, 5-azacytidine treatment could result in loss of the metastatic phenotype in lines that had been stable T+/M+. The changes in tumorigenic and metastatic phenotypes were not associated with altered immunogenicity of the cells. Monoclonal antibodies were generated against T+/M+ cells, and one antibody ( M36D3 ) was found to bind only to T+/M+ cells. Reactivity of the antibody was found to co-vary with expression of the metastatic phenotype. The antigen recognized by M36D3 antibody thus seems to be associated with metastatic capability. The antigen was found by two-dimensional gel electrophoretic analysis to be a cellular protein of Mr approximately equal to 45,000 and pI approximately equal to 6.7.

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Selected References

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