Objective: To analyze the interaction between the microRNA-338 and its targeting proteins during the cerebral ischemia and reperfusion injury.
Methods: TargetScan was used to predict the targets of microRNA-338. The potential targeting proteins were then selected according to their secondary structures using RNA structure 4.6 software and their involvement in cerebral ischemia and reperfusion injury was studied. Dual-luciferase reporter assay was used to testify whether microRNA-338 can recognize the 3'UTR of target protein. Western blot was applied to analyze the expression of eiF4E3 in both experimental group and control group.
Result: EiF4E3 was the most likely potential targeting protein of microRNA-338. The secondary structure of local region of eiF4E3 recognizing microRNA-338 was conservative. The ratio of firefly to renilla luciferase activity in the experimental group was much higher than that of control group. However, there was no significant difference in the expression of eiF4E3 between these two groups.
Conclusion: MicroRNA-338 can recognize the 3'UTR of eiF4E3 while it has no significant effect on the expression of eiF4E3. The post-target-recognizing regulation for miRNA do exist and this mechanism is possibly related to the tertiary structure of target mRNA.
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