FTO/RUNX2 signaling axis promotes cementoblast differentiation under normal and inflammatory condition

Area of Science:

• Biochemistry
• Molecular Biology
• Developmental Biology

Background:

• N⁶-methyladenosine (m⁶A) is a prevalent mRNA modification impacting biological processes.
• The role of m⁶A modifications in cementogenesis is largely unexplored.

Purpose of the Study:

• To investigate the role of the m⁶A demethylase Fat mass and obesity-associated protein (FTO) in cementogenesis.
• To elucidate the molecular mechanisms underlying FTO's function in cementoblast differentiation and mineralization.

Main Methods:

• Time-series transcriptomic analysis.
• Knockdown of FTO in OCCM-30 cells and murine models.
• Investigation of FTO interaction with Runx2 mRNA and YTHDF2.
• Analysis of TNF-α effects on cementogenesis.

Main Results:

• FTO is involved in cementogenesis, with FTO knockdown impairing cementoblast differentiation and mineralization.
• FTO directly binds Runx2 mRNA, preventing its degradation by YTHDF2.
• YTHDF2 knockdown rescues Runx2 expression in FTO-deficient cells.
• TNF-α inhibits cementogenesis via the FTO/RUNX2 axis.

Conclusions:

• The FTO/RUNX2 axis plays a critical role in regulating normal and pathological cementogenesis.
• FTO-mediated stabilization of Runx2 mRNA is essential for cementoblast differentiation and mineralization.
• Inflammation-induced inhibition of cementogenesis involves the FTO/RUNX2 pathway.