Oncotarget

Research Papers:

A novel mitosis-associated lncRNA, MA-linc1, is required for cell cycle progression and sensitizes cancer cells to Paclitaxel

Or Bida _, Moriah Gidoni, Diana Ideses, Sol Efroni and Doron Ginsberg

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Oncotarget. 2015; 6:27880-27890. https://doi.org/10.18632/oncotarget.4944

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Abstract

Or Bida1, Moriah Gidoni1, Diana Ideses1, Sol Efroni1, Doron Ginsberg1

1The Mina and Everard Goodman Faculty of Life Science, Bar Ilan University, Ramat Gan 52900, Israel

Correspondence to:

Doron Ginsberg, e-mail: doron.ginsberg@biu.ac.il

Keywords: lncRNA, cell cycle, Paclitaxel, E2F

Received: March 12, 2015     Accepted: July 31, 2015     Published: August 11, 2015

ABSTRACT

Long noncoding RNAs (lncRNAs) are major regulators of many cellular processes including cell cycle progression and tumorigenesis. In this study, we identify a novel lncRNA, MA-linc1, and reveal its effects on cell cycle progression and cancer growth. Inhibition of MA-linc1 expression alters cell cycle distribution, leading to a decrease in the number of G1 cells and a concomitant increase in all other stages of the cell cycle, and in particular G2/M, suggesting its involvement in the regulation of M phase. Accordingly, knock down of MA-linc1 inhibits M phase exit upon release from a mitotic block. We further demonstrate that MA-linc1 predominantly functions in cis to repress expression of its neighboring gene, Purα, which is often deleted in human cancers and whose ectopic expression inhibits cell cycle progression. Knock down of Purα partially rescues the MA-linc1 dependent inhibition of M phase exit. In agreement with its suggested role in M phase, inhibition of MA-linc1 enhances apoptotic cell death induced by the antimitotic drug, Paclitaxel and this enhancement of apoptosis is rescued by Purα knockdown. Furthermore, high levels of MA-linc1 are associated with reduced survival in human breast and lung cancer patients.

Taken together, our data identify MA-linc1 as a novel lncRNA regulator of cell cycle and demonstrate its potential role in cancer progression and treatment.


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