let-7c-5p promotes fracture healing by downregulating CDK8

Area of Science:

• Biochemistry
• Molecular Biology
• Orthopedics

Background:

• let-7c-5p expression is decreased in tibial fracture patients.
• let-7c-5p may play a crucial role in bone repair processes.

Purpose of the Study:

• To investigate the regulatory role of let-7c-5p in osteogenic differentiation.
• To elucidate the mechanism by which let-7c-5p influences tibial fracture healing.

Main Methods:

• Serum let-7c-5p levels were quantified using RT-qPCR in 80 fracture patients and 83 controls.
• Osteogenic differentiation was induced in MC3T3-E1 cells.
• let-7c-5p's targeting of CDK8 was confirmed via dual-luciferase reporter and RNA immunoprecipitation assays.

Main Results:

• Serum let-7c-5p levels were lower in early fracture stages, increasing with healing.
• let-7c-5p positively correlated with osteogenic markers and alkaline phosphatase activity.
• let-7c-5p directly inhibited CDK8 expression, and CDK8 overexpression reversed let-7c-5p's pro-osteogenic effects.

Conclusions:

• let-7c-5p promotes osteogenic differentiation by inhibiting CDK8.
• let-7c-5p plays a vital role in accelerating tibial fracture healing.