Study points to therapeutic target for common and aggressive ovarian cancer

MicroRNA molecule role in cancer gene expression broader than previously thought.

Small, non-coding molecules called microRNAs are known to play an important role in cancer development. Researchers now have shown their significance is greater than previously thought, a finding that could lead to new therapeutic approaches for the most common and deadly form of ovarian cancer.

The study results, published in the May 5, 2016 online issue of Cell Reports, were reported by a team led by Gordon Mills, Ph.D., chair of Systems Biology at The University of Texas MD Anderson Cancer Center.

“MicroRNAs appear to have evolved to regulate cellular functions through having many different targets, and were thought to function mainly through down regulating the levels or functions of messenger RNA,” said Mills. “Remarkably, this study shows that microRNAs can also up regulate the expression of key cancer genes directly. This suggests that the mechanisms by which microRNAs regulate cellular function are much broader than was generally accepted.”

The team, using data from The Cancer Genome Atlas, zeroed in on the biochemical interplay between a transcription factor, STAT3, which has been associated with poor outcome in ovarian cancer patients when present in high levels, and a microRNA called miR551b. This little-studied microRNA now has been shown to impact STAT3 protein levels, contributing to resistance to cell death and increased proliferation of cancer cells both in vivo and in vitro. Mills believes this points to miR551b as a “promising candidate biomarker and therapeutic target.”

“The study supports the concept that targeting miR551b expression could block STAT3 activity, and prove useful for treating ovarian cancers,” said Mills. “We believe these findings warrant further evaluation of anti-miR therapies.”

To explore the potential of miR551b as a therapeutic target, Mills’ team treated mice with an anti-miR551b therapy, twice a week for a month and observed markedly decreased tumor growth.

“Our results demonstrate the therapeutic potential of anti-miR551b in treating ovarian cancers with high levels of miR551b,” said Mills. “Future studies will need to examine the activity of combination therapy of anti-miR551b with other therapeutic interventions.”

The study was funded by the National Institutes of Health (2P50CA083639-11, 5P50CA058183-17, 5R01CA123219-01, P50CA083639, P50CA098258, U54CA151668, UH2TR000943, 1UH2TR00942-01 and 1RO1CA182905-01); Stand Up To Cancer/American Association of Cancer Research (KG081694); the Dr. Miriam and Sheldon G. Adelson Medical Research Foundation; the Komen Promise Grant (KG081694); the Ovarian Cancer Research Fund; and the Marsha Rivkin Center for Ovarian Cancer Research.

Direct Upregulation of STAT3 by MicroRNA-551b-3p Deregulates Growth and Metastasis of Ovarian Cancer. Pradeep Chaluvally-Raghavan, Kang Jin Jeong, Sunila Pradeep, Andreia MachadoSilva, Shuangxing Yu, Wenbin Liu, Tyler Moss, Cristian Rodriguez-Aguayo, Dong Zhang, Prahlad Ram, Jinsong Liu, Yiling Lu, Gabriel Lopez-Berestein, George A. Calin, Anil K. Sood, Gordon B. Mills. Cell Reports. DOI:10.1016/j.celrep.2016.04.034. Published online May 5, 2016.

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