Osteogenic growth peptide promotes osteogenic differentiation of mesenchymal stem cells mediated by LncRNA AK141205-induced upregulation of CXCL13

The aim of present study was to characterize long non-coding RNA (lncRNA) AK141205 as a cellular regulator of osteogenic differentiation of mice mesenchymal stem cells (MSCs) towards osteogenic growth peptide (OGP) stimulation. Mice MSCs cells were isolated, transfected with si-AK141205, pcDNA-AK141205 or control, and stimulated with OGP. The AK141205, CXC chemokine ligand-13 (CXCL13), and osteogenic differentiation-associated parameters were determined by western blotting or quantitative RT-PCR. To determine the role of AK141205/CXCL13 in SMCs osteogenic differentiation, SMCs subjected to co-transfection of pcDNA-AK141205 and si-CXCL13 or si-AK141205 and pcDNA-CXCL13, and were submitted for osteogenic differentiation-associated parameters analyses. The results showed that stimulation of SMCs with OGP induced upregulation of both AK141205 and CXCL13, and osteogenic differentiation of MSCs. Transfection of si-AK141205 partly suppressed OGP-induced formation of calcium salt nodules, alkaline phosphatase (ALP) activity and osteogenic differentiation-associated gene expression, suggesting key regulatory role of AK141205. Analysis of CXCL13 expression in SMCspcDNA−AK141205 revealed that AK141205 positively promoted CXCL13 expression via acetylation of H4 histone in the promoter region. This signal transduction was demonstrated to be essential for OGP-induced osteogenic differentiation of MSCs through osteogenic differentiation analysis in simultaneously AK141205/CXCL13 controlled SMCs. In summary, we report a completely novel role of AK141205/CXCL13 as a regulator of OGP-induced osteogenic differentiation of SMCs. Our finding provides a potential therapeutic targeting of AK141205 for enhancing disease-treatment effect of SMCs.