Journal Article

The mRNA-edited form of GABRA3 suppresses GABRA3-mediated Akt activation and breast cancer metastasis

Wang, Jian, Sakurai, Masayuki, Kossenkov, Andrew V., Xu, Hua, Zhang, Paul J., Showe, Louise C., Yan, Jinchun, Zhang, Lin, Huang, Qihong, Li, Anping, Li, Yan, Nishikura, Kazuko, Gumireddy, Kiranmai

2016

Overview

Metastasis is a critical event affecting breast cancer patient survival. To identify molecules contributing to the metastatic process, we analysed The Cancer Genome Atlas (TCGA) breast cancer data and identified 41 genes whose expression is inversely correlated with survival. Here we show that GABA A receptor alpha3 (Gabra3), normally exclusively expressed in adult brain, is also expressed in breast cancer, with high expression of Gabra3 being inversely correlated with breast cancer survival. We demonstrate that Gabra3 activates the AKT pathway to promote breast cancer cell migration, invasion and metastasis. Importantly, we find an A-to-I RNA-edited form of Gabra3 only in non-invasive breast cancers and show that edited Gabra3 suppresses breast cancer cell invasion and metastasis. A-to-I-edited Gabra3 has reduced cell surface expression and suppresses the activation of AKT required for cell migration and invasion. Our study demonstrates a significant role for mRNA-edited Gabra3 in breast cancer metastasis. GABRA3, a subunit of the GABA receptor, is often highly expressed in brain metastasis and breast cancers. Here, the authors demonstrated that GABRA3 activates AKT to promote breast cancer cell invasion and that the A-to-I edited form of GABRA3, specifically expressed in noninvasive breast cancers, can suppress the function of wild type GABRA3.

• Publisher: Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
• Subject: 631/67/1347 / 631/67/322 / 631/80/84/2336 / 631/80/86 / Adenosine / Animals / Breast cancer / Breast Neoplasms - genetics / Breast Neoplasms - pathology / Case-Control Studies / Cell adhesion & migration / Cell Line, Tumor / Cell Movement - genetics / Chloride / Editing / Female / Gene Expression Regulation, Neoplastic / Genomes / Genomics / Hospitals / Humanities and Social Sciences / Humans / MCF-7 Cells / Medical prognosis / Medicine / Metastasis / Mice / multidisciplinary / Neoplasm Invasiveness / Neoplasm Metastasis / Neoplasm Staging / Neoplasm Transplantation / Proportional Hazards Models / Proto-Oncogene Proteins c-akt - metabolism / Receptors, GABA-A - genetics / Receptors, GABA-A - metabolism / RNA Editing - genetics / RNA, Messenger - genetics / RNA, Messenger - metabolism / Science / Science (multidisciplinary) / Survival analysis