Abnormal stress promotes intervertebral disc degeneration through WTAP/YTHDF2-dependent TIMP3 m6A modification.

Area of Science:

• Biochemistry
• Molecular Biology
• Biomedical Engineering

Background:

• Mechanical stress is a key factor in intervertebral disc degeneration (IDD).
• The precise molecular mechanisms linking mechanical stress to IDD remain incompletely understood.
• Understanding these mechanisms is crucial for developing targeted therapies.

Purpose of the Study:

• To elucidate the role of WTAP/YTHDF2-mediated m6A modification in abnormal stress-induced intervertebral disc (IVD) matrix degradation.
• To investigate the impact of mechanical tension on WTAP expression and its downstream effects on TIMP3.
• To explore therapeutic strategies targeting this pathway for IDD alleviation.

Main Methods:

• Analyzing WTAP expression in human and rat nucleus pulposus cells and tissues under varying mechanical stress.
• Investigating the interaction between WTAP, YTHDF2, and TIMP3 mRNA using m6A methylation assays.
• Assessing the functional consequences of altered TIMP3 levels on matrix metalloproteinases and extracellular matrix degradation.
• Evaluating the therapeutic potential of inhibiting WTAP or overexpressing TIMP3 in vitro and in vivo models of IDD.

Main Results:

• WTAP expression is upregulated in nucleus pulposus cells under tension and in degenerated tissues.
• WTAP promotes TIMP3 mRNA methylation, leading to YTHDF2-mediated degradation.
• Reduced TIMP3 levels increase matrix metalloproteinase activity, causing extracellular matrix degradation and promoting IDD.
• Inhibition of WTAP or overexpression of TIMP3 enhances stress resistance and alleviates IDD.

Conclusions:

• Abnormal mechanical stress triggers WTAP/YTHDF2-dependent m6A modification of TIMP3.
• This molecular pathway disrupts IVD matrix stability and accelerates degeneration.
• Targeting the WTAP/YTHDF2/TIMP3 axis offers a promising therapeutic strategy for IDD.