Format

Send to

Choose Destination
Cancer Lett. 2017 Jan 28;385:198-206. doi: 10.1016/j.canlet.2016.10.023. Epub 2016 Oct 22.

The long non-coding RNA 91H increases aggressive phenotype of breast cancer cells and up-regulates H19/IGF2 expression through epigenetic modifications.

Author information

1
INSERM U908, 59655 Villeneuve d'Ascq, France; University of Lille, 59655 Villeneuve d'Ascq, France.
2
CNRS UMR 8161, 59021 Lille, France.
3
INSERM U908, 59655 Villeneuve d'Ascq, France; Centre Oscar Lambret, 59020 Lille, France.
4
PLETHA, Institut Pasteur Lille, 59019 Lille, France.
5
INSERM U908, 59655 Villeneuve d'Ascq, France; University of Lille, 59655 Villeneuve d'Ascq, France. Electronic address: eric.adriaenssens@univ-lille1.fr.

Abstract

Numerous genomic imprinting loci are regulated by long non-coding RNA (lncRNA). We have previously identified a new lncRNA at the H19/IGF2 locus transcribed in H19 antisense orientation and named 91H. This RNA is conserved among mammals. In mice, 91H regulates positively IGF2 expression from a novel promoter. However, in human the function of 91H at the H19/IGF2 locus remains largely undeciphered. Here, we observed that 91H, H19 and IGF2 are overexpressed in breast tumors. By using 91H-knockdown breast cancer cells, we demonstrated that 91H exerts oncogenic properties by promoting cell growth, migration and invasion as well as tumor growth in xenografted immunodeficient mouse model. Moreover, 91H-knockdown reduces the expression of H19 and IGF2 in breast cancer cells. By chromatin-immunoprecipitation and methylation studies, we found that 91H expression prevents histone and DNA methylation on the maternal allele at the H19/IGF2 locus. These results indicate that 91H, through epigenetic modifications, is responsible of the maintenance of H19/IGF2 genomic imprinting allowing the allele-specific expression of H19 and IGF2. Taken together, overexpression of 91H in breast cancer and 91H-induced epigenetic modifications on H19/IGF2 locus suggest that 91H may play essential role in breast cancer development. Further studies are needed to investigate their role in terms of diagnosis and therapeutic.

KEYWORDS:

Breast tumorigenesis; Genomic imprinting; H19 antisense; Long non-coding RNA

PMID:
27780718
DOI:
10.1016/j.canlet.2016.10.023
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center