our previous study revealed that treatment with a combination of fibroblast growth factor-2 and melatonin (MEL) synergistically augmented osteogenic activity and mineralization of Mc3T3-e1 mouse preosteoblast cells. Thus, the objective of the present study was to assess the effect of MEL on osteogenetic characteristics in human osteoblastic cells. Human jawbone-derived osteoblastic (hoB) cells were isolated from mandibular bone fragments. RUNX family transcription factor 2 (runx2) expression, alkaline phosphatase (alP) enzyme activity and the mineralization ability of hoB cells in the presence of Mel were evaluated. Microarray analysis was also performed to assess the expression of Mel-induced micrornas (mirnas/mirs) in hOB cells. Treatment with MEL significantly enhanced runx2 expression, alP activity and mineralization staining. However, this effect was significantly reduced following transforming growth factor-β1 treatment. in total, 124 mirnas were differentially expressed in Mel-treated hOB cells, compared with untreated cells. Of the upregulated miRNAs, miR-181c-5p exhibited the largest fold change. Runx2 mRNA expression and mineralization staining in the presence of MEL were significantly reduced following transfection with a mir-181c-5p inhibitor. in addition, transfection with miR-181c-5p mimics significantly increased Runx2 expression and mineralization staining. These results suggested that MEL-induced miR-181c-5p was involved in osteogenic differentiation and mineralization of hOB cells. Using TargetScan, a putative miR-181c-5p binding site was identified in the Notch2 gene. Moreover, Notch2 mRNA and protein expression levels in hOB cells were significantly reduced following transfection with miR-181c-5p mimics, confirming Notch2 as a target gene for miR-181c-5p. Notch2 siRNA knockdown significantly increased Runx2 expression and mineralization staining, which suggested that Notch2 may negatively regulate osteogenic differentiation of hOB cells by downregulating Runx2. In conclusion, MEL-induced expression of miR-181c-5p enhanced osteogenic differentiation and calcification of hOB cells.