PMID: 9544423Apr 17, 1998Paper

Therapy of cancer metastasis by activation of the inducible nitric oxide synthase

Cancer Metastasis Reviews
K Xie, I J Fidler

Abstract

The process of cancer metastasis consists of multiple sequential and highly selective steps. The vast majority of tumor cells that enter the circulation die rapidly; only a few survive to produce metastases. This survival is not random. Metastases are clonal in origin and are produced by specialized subpopulations of cells that preexist in a heterogeneous primary tumor. Experimental studies concluded that metastatic cells survive in the circulation whereas nonmetastatic cells do not. In part, this difference is due to an inverse correlation between expression of endogenous inducible nitric oxide synthase (iNOS) and production of nitric oxide (NO) and metastatic potential. Direct evidence for the role of iNOS in metastasis has been provided by our data on transfection of highly metastatic murine K-1735 clone 4 (C4.P) cells which express low levels of iNOS, with a functional iNOS (C4.L8), inactive mutated iNOS (C4.S2), or neomycin resistance (C4.Neo) genes in medium containing 3 mM of the specific iNOS inhibitor NG-L-methyl arginine (NMA). C4.P, C4.Neo, and C4.S2 cells were highly metastatic, whereas C4.L8 cells were not. Moreover, C4.L8 cells produced slow-growing subcutaneous tumors in nude mice, whereas the other 3 cell lines ...Continue Reading

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