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Background/Aims:   Low back pain has become one of the most common musculoskeletal diseases in the world. Studies have shown that intervertebral disc degeneration (IDD) is an important factor leading to low back pain, but the mechanisms underlying IDD remain largely unknown. Research over the past decade has suggested critical roles for microRNAs (miRNAs) in natural growth and disease progression. However, it remains poorly understood whether circular RNAs participate in IDD.   Methods:   Clinical IDD samples were collected from 20 patients who underwent discectomy. Weighted gene co-expression network analysis was used to identify the co-expression miRNA network modules (highly co-expressed clusters of miRNAs) that were associated with IDD grade.   Results:   miR-3150a-3p was the most significantly up-regulated miRNA in module “Blue.” Notably, aggrecan ( ACAN ) was identified as a direct target gene of miR-3150a-3p and  ACAN  expression was regulated by miR-3150a-3p. Overexpression of miR-3150a-3p decreased  ACAN  expression in nucleus pulposus cells, whereas inhibition of miR-3150a-3p increased  ACAN  expression. In addition,  ACAN  expression was negatively correlated with IDD grade.   Conclusion:   Our study suggests that the reduction of  ACAN  expression induced by the upregulation of miR-3150a-3p might participate in the development of IDD.

Dysregulated MiR-3150a-3p Promotes Lumbar Intervertebral Disc Degeneration by Targeting Aggrecan