Asymmetric expression of GPR126 in the convex/concave side of the spine is associated with spinal skeletal malformation in adolescent idiopathic scoliosis population.

PURPOSE:To determine the relationship between the bone formation-related functions of GPR126 and the structural asymmetry of spine in adolescent idiopathic scoliosis (AIS). METHODS:Vertebral body samples were obtained from 51 AIS patients during spinal surgery between October 2014 and November 2017, and the expression pattern of GPR126 in the convex/concave sides of AIS spine was identified by RT-qPCR. Next, we explored the bone formation-related functions of GPR126 by knocking down and overexpressing GPR126 in human mesenchymal stem cells (hMSC) and further performing osteogenic differentiation. We also applied overexpression of N-terminal fragments derived from GPR126 (GPR126-NTFs) and osteogenic differentiation experiments to determine the functional part of GPR126 in skeletal development. RESULTS:We provided evidence that GPR126 showed a marked convex/concave asymmetric expression in the spine of AIS. Further RNA detection found that exon6-included transcripts of GPR126 (GPR126-exon6ⁱⁿ) were significantly higher expressed in the convex side of AIS patients. Knocking down of GPR126 accelerated ossification of hMSCs during osteogenic differentiation, and overexpression of GPR126-exon6ⁱⁿ delayed this process. Overexpression of GPR126-NTFs revealed that NTF is a functional fragment and exon6-included NTF (NTF-exon6ⁱⁿ) delayed ossification of hMSCs. CONCLUSION:Our findings indicated that GPR126-NTFs play a role in skeletal development, and the inclusion/exclusion of exon6 may regulate the bone formation-related functions of GPR126. The convex/concave asymmetric expression of GPR126-exon6ⁱⁿ may be an important factor in abnormal bone formation of AIS. These slides can be retrieved under Electronic Supplementary Material.

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