Function and distribution of of miRNA in pituitary adenoma

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In the present study, we focused on signaling cascade via miRNA regulating prolactin(PRL) in pituitary adenoma cell. Profiling analysis comparing rat normal pituitary(RPC) and GH3, rat pituitary adenoma cell line, was examined to identify miRNA showing negative co-relation. Subsequently, each miRNA was knocked-down by targeting siRNA followed by ELISA study to evaluate PRL secretion. Furthermore, signaling cascade was analyzed by cDNA microarray analysis. Among miRNA significantly elevated in GH3 cells than RPC, we found rno-miR-101b,-191, and-194 were related to PRL secretion. Meanwhile, GH3 cells transfected of rno-miR-101b gene revealed reduced expression of PRL and its receptor. In conclusion, GH3 expressed different amount of miRNA and in particular, rno-miR-101 mediated PRL production. The miRNA can be a promising target for the treatment of pituitary adenoma.