MiR-24 inhibits oligodendrocyte precursor cell differentiation after spinal injury by targeting adrenal medulla
1Department of General Surgery, the Second Affiliated Hospital of Jianghan University, Wuhan, Hubei, China. tao60180139@126.com.
Objective:
Oligodendrocyte precursor cells (OPCs) differentiate into oligodendrocytes (OLs) that provide nutrients to neurons. Adrenal medulla is (ADM) involved in nerve damage. MiR-24 participates in various diseases. However, the regulation and mechanism of miR-24 in oligodendrocyte precursor cell differentiation after spinal injury is unclear. MATERIALS AND METHODS: Wistar rats were divided into sham operation group and model group. Real Time-PCR detects miR-24, PDGFRa and NG2 and MBP expression. OPC cells were cultured and divided into control group, miR-24 group, and si-miR-24 group followed by analysis of miR-24 expression by Real Time-PCR, expression of PDGFRa, NG2 and MBP by Western blot, as well as ADM content and secretion of IL-6 and TNF-α by enzyme-linked immunosorbent assay (ELISA).
Results:
Expression of miR-24, PDGFRa, and NG2 was increased in the model group and MBP and ADM expression was decreased with increased secretion of IL-6 and TNF-α. Compared with control group, the difference was statistically significant (p<0.05). Upregulation of miR-24 promoted the expression of PDGFRa and NG2, decreased MBP and ADM level, and increased IL-6 and TNF-α secretion. Compared with control group, the difference was statistically significant (p<0.05). Downregulation of miR-24 reversed the above changes, and the difference was statistically significant (p<0.05).
Conclusions:
MiR-24 expression is increased in spinal injury. Upregulation of miR-24 expression reduces adrenal medulla expression and inhibits oligodendrocyte precursor cell differentiation.
Insights
MicroRNA-24 (miR-24) levels increase after spinal cord injury, inhibiting oligodendrocyte precursor cell differentiation. This study clarifies miR-24's role in nerve damage and OPC development.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Oligodendrocyte precursor cells (OPCs) differentiate into oligodendrocytes, crucial for neuronal support.
- Adrenal medulla (ADM) is implicated in nerve damage, and miR-24 is involved in various diseases.
- The precise role of miR-24 in OPC differentiation following spinal cord injury remains unclear.
Purpose of the Study:
- To investigate the regulation and mechanism of miR-24 in OPC differentiation after spinal cord injury.
- To determine the effect of miR-24 on OPC differentiation markers and inflammatory factors.
Main Methods:
- Wistar rats were subjected to sham operation or spinal cord injury model.
- Real-Time PCR was used to detect miR-24, PDGFRa, NG2, and MBP expression.
- OPC cultures were manipulated with miR-24 mimics or inhibitors, followed by Western blot and ELISA analysis for ADM, IL-6, and TNF-α.
Main Results:
- Spinal cord injury model showed increased miR-24, PDGFRa, and NG2 expression, with decreased MBP and ADM.
- Upregulation of miR-24 promoted PDGFRa and NG2, reduced MBP and ADM, and increased IL-6 and TNF-α secretion.
- Downregulation of miR-24 reversed these effects.
Conclusions:
- MiR-24 expression is elevated in spinal cord injury.
- Increased miR-24 expression reduces adrenal medulla levels and inhibits OPC differentiation.
- MiR-24 plays a significant role in the pathological process of spinal cord injury affecting OPCs.
