Sustained activation of ERK1/2 by NGF induces microRNA-221 and 222 in PC12 cells.
MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression by inhibiting translation and/or inducing degradation of target mRNAs, and they play important roles in a wide variety of biological functions including cell differentiation, tumorigenesis, apoptosis and metabolism. However, there is a paucity of information concerning the regulatory mechanism of miRNA expression. Here we report identification of growth factor-regulated miRNAs using the PC12 cell line, an established model of neuronal growth and differentiation. We found that expression of miR-221 and miR-222 expression were induced by nerve growth factor (NGF) stimulation in PC12 cells, and that this induction was dependent on sustained activation of the extracellular signal-regulated kinase 1 and 2 (ERK1/2) pathway. Using a target prediction program, we also identified a pro-apototic factor, the BH3-only protein Bim, as a potential target of miR-221/222. Overexpression of miR-221 or miR-222 suppressed the activity of a luciferase reporter activity fused to the 3' UTR of Bim mRNA. Furthermore, overexpression of miR-221/222 decreased endogenous Bim mRNA expression. These results reveal that the ERK signal regulates miR-221/222 expression, and that these miRNAs might contribute to NGF-dependent cell survival in PC12 cells.
Terasawa
Kazuya
K
Department of Pharmcogenomics, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Japan.
Ichimura
Atsuhiko
A
Sato
Fumiaki
F
Shimizu
Kazuharu
K
Tsujimoto
Gozoh
G
D020121:5' Untranslated Regions / Q000235:genetics; D000818:Animals; D051017:Apoptosis Regulatory Proteins / Q000235:genetics; D001483:Base Sequence; D000072224:Bcl-2-Like Protein 11; D015153:Blotting, Western; D002070:Butadienes / Q000494:pharmacology; D003513:Cycloheximide / Q000494:pharmacology; D004791:Enzyme Inhibitors / Q000494:pharmacology; D015870:Gene Expression / Q000187:drug effects; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D008565:Membrane Proteins / Q000235:genetics; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000037:antagonists & inhibitors / Q000378:metabolism*; D048052:Mitogen-Activated Protein Kinase 3 / Q000037:antagonists & inhibitors / Q000378:metabolism*; D020932:Nerve Growth Factor / Q000494:pharmacology*; D009570:Nitriles / Q000494:pharmacology; D016716:PC12 Cells; D014176:Protein Biosynthesis / Q000187:drug effects; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D011518:Proto-Oncogene Proteins / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012689:Sequence Homology, Nucleic Acid; D015398:Signal Transduction / Q000187:drug effects; D013997:Time Factors
D020121:5' Untranslated Regions; D051017:Apoptosis Regulatory Proteins; D000072224:Bcl-2-Like Protein 11; C000606778:Bcl2l11 protein, rat; D002070:Butadienes; D004791:Enzyme Inhibitors; D008565:Membrane Proteins; D035683:MicroRNAs; D009570:Nitriles; D011500:Protein Synthesis Inhibitors; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; C113580:U 0126; D020932:Nerve Growth Factor; D003513:Cycloheximide; D008156:Luciferases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3