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. 1993 Nov;68(5):874–878. doi: 10.1038/bjc.1993.448

Expression of the nm23-2/NDP kinase alpha gene in rat mammary and oral carcinoma cells of varying metastatic potential.

B R Henderson 1
PMCID: PMC1968727  PMID: 8217603

Abstract

Reduced expression of the putative metastasis-suppressor gene, nm23-1, has previously been correlated with high tumour metastatic potential. The involvement of the related and proximally-located nm23-2 gene in the suppression of tumour metastasis, however, has not yet been tested. In this study, we compared nm23-2 RNA levels in cell lines derived from three independent rat mammary carcinomas. Northern blot analysis revealed no correlation between nm23-2 RNA levels and metastatic potential in parent or clonal cell lines derived from chemically-induced (MAT 13762, DMBA-8) or spontaneous (BC1) rat mammary carcinomas. Cloning and sequencing of an nm23-2 cDNA from metastatic BC1 cells demonstrated that the predicted coding sequence of nm23-2 RNA in these cells was not inactivated by mutation. Further analysis showed that the nm23-2 gene was not down-regulated in H-ras-transfected metastatic clones or other metastatic cell lines derived from a spontaneous rat paraoral squamous cell carcinoma, B10. The data do not suggest a correlation between nm23-2 gene expression and metastasis-suppression in these tumours.

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Selected References

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