Hsa-miR-155-5p (miR-155) is overexpressed in most solid and hematological malignancies. It promotes loss of genomic integrity in cancer cells by targeting genes involved in microsatellite instability and DNA repair; however, the link between miR-155 and aneuploidy has been scarcely investigated. Here we describe a novel mechanism by which miR-155 causes chromosomal instability. Using osteosarcoma cells (U2OS) and normal human dermal fibroblast (HDF), two well-established models for the study of chromosome congression, we demonstrate that miR-155 targets the spindle checkpoint proteins BUB1, CENP-F, and ZW10, thus compromising chromosome alignment at the metaphase plate. In U2OS cells, exogenous miR-155 expression reduced the recruitment of BUB1, CENP-F, and ZW10 to the kinetochores which resulted in defective chromosome congression. In contrast, during in vitro transformation of HDF by enforced expression of SV40 Large T antigen and human telomerase (HDFLT/hTERT), inhibition of miR-155 reduced chromosome congression errors and aneuploidy at early passages. Using live-cell imaging we observed that miR-155 delays progression through mitosis, indicating an activated mitotic spindle checkpoint, which likely fails to reduce aneuploidy. Overall, this study provides insight into a mechanism that generates aneuploidy at early stages of cellular transformation, pointing to a role for miR-155 in chromosomal instability at tumor onset.
Hsa-miR-155-5p drives aneuploidy at early stages of cellular transformation
Sara Pagotto,A. Veronese,Alessandra Soranno,P. Lanuti,Mirco Di Marco,M. V. Russo,A. Ramassone,M. Marchisio,P. Simeone,P. Guanciali Franchi,G. Palka,R. Costantini,C. Croce,R. Visone
Published 2018 in OncoTarget
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- Publication year
2018
- Venue
OncoTarget
- Publication date
2018-02-07
- Fields of study
Biology, Medicine
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Semantic Scholar, PubMed
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