Journal Article

Tumour-derived and host-derived nitric oxide differentially regulate breast carcinoma metastasis to the lungs

Nolwenn Gauthier, Sylvia Lohm, Claude Touzery, Aurélie Chantôme, Bernard Perette, Sylvie Reveneau, François Brunotte, Lucienne Juillerat-Jeanneret and Jean-François Jeannin

in Carcinogenesis

Volume 25, issue 9, pages 1559-1565
Published in print September 2004 | ISSN: 0143-3334
Published online September 2004 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgh158
Tumour-derived and host-derived nitric oxide differentially regulate breast carcinoma metastasis to the lungs

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To study the role of nitric oxide (NO) in lung metastasis of breast carcinoma, we isolated two cell clones (H and J) from the parental EMT-6 murine breast carcinoma cell line, based on their differential NO production. In vitro, EMT-6 J cells, but not EMT-6H cells, constitutively expressed inducible NO synthase (NOS II) and secreted high levels of NO. IL-1β increased NO production in both clones, and TNF-α had a synergistic effect on IL-1β-induced NO production, but NO production by EMT-6 J cells was always higher than by EMT-6H cells. Proliferation, survival and adhesion to lung-derived endothelial cells of both clones were similar and were not affected by NO. In vivo, both clones similarly located in the lungs of syngeneic mice 48 h after injection. However, EMT-6H cells were significantly more tumorigenic than EMT-6 J cells as assessed at later time points. Injection of EMT-6 J cells and simultaneous treatment of mice with aminoguanidine (AG), a NOS II inhibitor, significantly increased tumour formation. Injection of EMT-6H and EMT-6 J cells into NOS II-deficient mice resulted in a significant survival increase as compared with wild-type animals. Simultaneous administration of AG increased the death rate of NOS II-deficient mice injected with EMT-6 J cells. These results demonstrate that: (i) NO does not influence the early stages of tumour metastasis to the lungs and (ii) NOS II expression in tumour cells reduces, while NOS II expression in host cells enhances, tumour nodule development. In conclusion, the cellular origin and the local NO production are critical in the metastatic process.

Keywords: AG, aminoguanidine; EMEM, Eagle's minimal essential medium; MMP, matrix metalloproteinase; MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide; NO, nitric oxide; NOS II, inducible nitric oxide synthase

Journal Article.  6146 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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