MicroRNA-130a represses transcriptional activity of aquaporin 4 M1 promoter

Sugunavathi Sepramaniam, Lim Kai Ying, Arunmozhiarasi Armugam, E Marelyn Wintour-Coghlan, Kandiah Jeyaseelan

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Abstract

Aquaporins (AQPs) are transmembrane water channels ubiquitously expressed in mammalian tissues. They play prominent roles in maintaining cellular fluid balance. Although expression of AQP1, -3, -4, -5, -8, -9, and -11 has been reported in the central nervous system, it is AQP4 that is predominately expressed. Its importance in fluid regulation in cerebral edema conditions has been highlighted in several studies, and we have also shown that translational regulation of AQP4 by miR-320a could prove to be useful in infarct volume reduction in middle cerebral artery occluded rat brain. There is evidence for the existence of two AQP4 transcripts (M1 and M23) in the brain arising from two alternative promoters. Because the AQP4 M1 isoform exhibits greater water permeability, in this study, we explored the possibility of microRNA-based transcriptional regulation of the AQP4 M1 promoter. Using RegRNA software, we identified 34 microRNAs predicted to target the AQP4 M1 promoter region. MicroRNA profiling, quantitative stem-loop PCR, and luciferase reporter assays revealed that miR-130a, -152, -668, -939, and -1280, which were highly expressed in astrocytes, could regulate the promoter activity. Of these, miR-130a was identified as a strong transcriptional repressor of the AQP4 M1 isoform. In vivo studies revealed that LNA(TM) anti-miR-130a could up-regulate the AQP4 M1 transcript and its protein to bring about a reduction in cerebral infarct and promote recovery.
Original languageEnglish
Pages (from-to)12006 - 12015
Number of pages10
JournalThe Journal of Biological Chemistry
Volume287
Issue number15
DOIs
Publication statusPublished - 2012

Cite this

Sepramaniam, S., Ying, L. K., Armugam, A., Wintour-Coghlan, E. M., & Jeyaseelan, K. (2012). MicroRNA-130a represses transcriptional activity of aquaporin 4 M1 promoter. The Journal of Biological Chemistry, 287(15), 12006 - 12015. https://doi.org/10.1074/jbc.M111.280701