Impaired Tertiary Dentin Secretion after Shallow Injury in Tgfbr2-Deficient Dental Pulp Cells Is Rescued by Extended...

Area of Science:

• Dental research
• Molecular biology
• Regenerative medicine

Background:

• Transforming growth factor β (TGFβ) signaling is crucial for development and repair.
• Dysregulated TGFβ signaling is linked to diseases like cancer and fibrosis.
• TGFβ receptor 2 (Tgfbr2) is vital for tooth development, including dentin formation and innervation.

Purpose of the Study:

• To investigate the role of Tgfbr2 in the neuro-pulpal response to dentin injury.
• To determine if Tgfbr2 regulates tertiary dentin formation and sensory innervation after injury.

Main Methods:

• Generated mice with a timed deletion of Tgfbr2 in dental pulp mesenchyme.
• Performed shallow dentin injury and analyzed tertiary dentin formation using microcomputed tomography and histology.
• Assessed calcitonin gene-related peptide (CGRP) axon sprouting via immunofluorescence.

Main Results:

• Tgfbr2-deficient mice showed reduced dentin volume initially post-injury, which normalized by day 56.
• Axon sprouting of CGRP+ sensory afferents was prolonged in Tgfbr2-deficient mice compared to controls.
• These findings suggest a compensatory role for sensory innervation in Tgfbr2-deficient dental pulp repair.

Conclusions:

• Tgfbr2 plays a role in regulating the neuro-pulpal response to dentin injury.
• Sensory afferents, specifically CGRP+ axons, may compensate for impaired Tgfbr2 signaling in odontoblasts.
• Targeting neuro-pulpal signaling offers potential for enhanced dental healing and treating TGFβ-related diseases.