MiR-148a impairs Ras/ERK signaling in B lymphocytes by targeting SOS proteins
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Julia Alles1, Nicole Ludwig1, Stefanie Rheinheimer1, Petra Leidinger1, Friedrich A. Grässer2, Andreas Keller3 and Eckart Meese1
1Institute of Human Genetics, Saarland University, 66421 Homburg, Germany
2Institute of Virology, Saarland University, 66421 Homburg, Germany
3Chair for Clinical Bioinformatics, Saarland University, 66123 Saarbrücken, Germany
Julia Alles, email: email@example.com
Keywords: B cells, microRNA, miR-148a, SOS, ERK
Received: March 15, 2017 Accepted: April 24, 2017 Published: May 07, 2017
Although microRNAs have been recognized as central cellular regulators, there is an evident lack of knowledge about their targets. Here, we analyzed potential target genes for miR-148a functioning in Ras signaling in B cells, including SOS1 and SOS2. A dual-luciferase reporter assay showed significantly decreased luciferase activity upon ectopic overexpression of miR-148a in HEK-293T cells that were co-transfected with the 3′UTR of either SOS1 or SOS2. Each of the 3′UTRs of SOS1 and SOS2 contained two binding sites for miR-148a both of which were necessary for the decreased luciferase activity. MiR-148a overexpression in HEK-293T lead to significantly reduced levels of both endogenous SOS1 and SOS2 proteins. Likewise, reduced levels of SOS proteins were found in two B cell lines that were transfected with miR-148a. The level of ERK1/2 phosphorylation as one of the most relevant downstream members of the Ras/ERK signaling pathway was also reduced in cells with miR-148a overexpression. The data show that miR-148a impairs the Ras/ERK signaling pathway via SOS1 and SOS2 proteins in B cells.
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