microRNA-125a-3p reduces cell proliferation and migration by targeting Fyn

L Ninio-Many, H Grossman, N Shomron… - Journal of cell …, 2013 - journals.biologists.com
L Ninio-Many, H Grossman, N Shomron, D Chuderland, R Shalgi
Journal of cell science, 2013journals.biologists.com
Fyn, a member of the Src family kinases (SFKs), has a pivotal role in cell adhesion,
proliferation, migration and survival, and its overexpression is associated with several types
of cancer. MicroRNAs (miRNAs) play a major role in post-transcriptional repression of
protein expression. In light of the significant functions of Fyn, together with studies
demonstrating miR-125a as a tumor-suppressing miRNA that is downregulated in several
cancer cell types and on our bioinformatics studies presented here, we chose to examine …
Summary
Fyn, a member of the Src family kinases (SFKs), has a pivotal role in cell adhesion, proliferation, migration and survival, and its overexpression is associated with several types of cancer. MicroRNAs (miRNAs) play a major role in post-transcriptional repression of protein expression. In light of the significant functions of Fyn, together with studies demonstrating miR-125a as a tumor-suppressing miRNA that is downregulated in several cancer cell types and on our bioinformatics studies presented here, we chose to examine the post-transcription regulation of Fyn by miR-125a-3p in the HEK 293T cell line. We show that Fyn expression can be dramatically reduced by elevated levels of miR-125a-3p. Following this reduction, the activity of proteins downstream of Fyn, such as FAK, paxillin and Akt (proteins known to be overexpressed in various tumors), is also reduced. On a broader level, we show that miR-125a-3p causes an arrest of the cell cycle at the G2/M stage and decreases cell viability and migration, probably in a Fyn-directed manner. The results are reinforced by control experiments conducted using Fyn siRNA and anti-miR-125a-3p, as well as by the fact that numerous cancer cell lines show a significant downregulation of Fyn after mir-125a-3p overexpression. Collectively, we conclude that miR-125a-3p has an important role in the regulation of Fyn expression and of its signaling pathway, which implies that it has a therapeutic potential in overexpressed Fyn-related diseases.
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