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Carcinogenesis, Vol. 23, No. 11, 1885-1895, November 2002
© 2002 Oxford University Press

CARCINOGENESIS

Overexpression of an ectopic H19 gene enhances the tumorigenic properties of breast cancer cells

Séverine Lottin1, Eric Adriaenssens1, Thierry Dupressoir2, Nathalie Berteaux1, Claire Montpellier3, Jean Coll4, Thierry Dugimont1 and Jean Jacques Curgy1,5

1 Laboratoire de Biologie du Développement, UPRES-EA 1033, SN3, USTL, 59655 Villeneuve d’Ascq Cedex,
2 Laboratoire de Pathologie Comparée, UMR8507, INRA/CNRS/UMII, cc101, 34095 Montpellier Cedex 5,
3 Laboratoire Assemblage et Réplication du Virus de l’Hépatite C, FRE CNRS 2369, IBL, BP 447, 59021 Lille Cedex and
4 Laboratoire d’Immunopathologie Cellulaire des Maladies Infectieuses, UMR 8527, IBL, BP 447, 59021 Lille Cedex, France

The maternally expressed H19 gene is transcribed as an untranslated RNA that serves as a riboregulator. We have previously reported that this transcript accumulates in epithelial cells in ~10% of breast cancers. To gain further insight on how the overexpression of the H19 gene affects the phenotype of human breast epithelial cells, we investigated the oncogenic potential of RNA that was abundantly expressed from MDA-MB-231 breast cancer cells stably transfected with the genomic sequence of the human H19 gene. The amount of H19 RNA did not affect cell proliferation capacity, timing of cell cycle phases or anchorage-dependent ability of H19-transfected clones in vitro. But in anchorage-independent growth assays the H19-recombined cells formed more and larger colonies in soft-agar versus control cells. To explore this phenotypic change, we analysed tumour development after subcutaneous injection of H19-recombined cells into scid mice. Results showed that H19 overexpression promotes tumour progression. These data support the hypothesis that an overload of H19 transcript is associated with cells exhibiting higher tumorigenic phenotypes and therefore we conclude that the H19 gene has oncogenic properties in breast epithelial cells.


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