Curcumin treatment reduced CGRP expression, mast cell degranulation, and the neuroimmune inflammatory response in the trigeminal ganglia of rats with pulpitis, promoting tissue repair.
CGRP & mast cells reducedCurcumin significantly decreased CGRP expression, mast cell degranulation, tryptase, PAR2, and TNF-α in the trigeminal ganglia while promoting bone repair in rats with pulpitis
What the researchers found
Pulpitis induced significant increases in CGRP-positive neurons and GFAP-positive satellite glial cells (SGCs) in the trigeminal ganglia, along with massive mast cell degranulation. Degranulated mast cells were scattered among CGRP-positive nerve fibers and tryptase-positive mast cells surrounded neurons.
Curcumin treatment: significantly decreased TNF-α, reduced mast cell degranulation, downregulated CGRP expression, decreased TLR4-positive neurons, reduced activated SGCs, lowered PAR2-positive neurons, decreased tryptase expression, and attenuated osteoclast activation in the apical periodontium. This demonstrates that curcumin can suppress the mast cell-CGRP neuroimmune axis in dental inflammation.
Why it matters
Dental pain from pulpitis involves CGRP-mediated neuroinflammation in the trigeminal system — the same neuropeptide pathway targeted by migraine drugs. Understanding how mast cells interact with CGRP neurons in dental inflammation could lead to new pain management strategies, and the finding that curcumin can modulate this pathway provides a natural anti-inflammatory approach.
How the study worked
Pulpitis was induced in Sprague-Dawley rats. Immunohistochemistry and toluidine blue staining assessed mast cell dynamics, tryptase expression, PAR2, and CGRP levels in the trigeminal ganglia over time. Curcumin was administered by intraperitoneal injection, and its effects on TLR4, CGRP, GFAP, CX3CL1, TNF-α, and other inflammatory markers were measured in the trigeminal ganglia.
What this study cannot tell us
The study was conducted in rats, and the pulpitis model may not fully replicate human dental inflammation. Curcumin was administered intraperitoneally, not orally or locally, so clinical relevance of the delivery route is uncertain. Curcumin has poor oral bioavailability in humans, which limits direct translation. Specific quantitative comparisons and dose-response data were not detailed in the abstract.
How to read the evidence
This is a preclinical animal study using a rat pulpitis model. While the immunohistochemical evidence is detailed and the findings are consistent across multiple markers, results are from an animal model with systemic (IP) curcumin delivery that may not reflect clinically achievable tissue concentrations.
When this study was published
Published in 2024, this study contributes to the growing understanding of CGRP's role in dental pain and the potential for natural compounds to modulate neurogenic inflammation.
The bigger picture
This study connects mast cell biology with CGRP neuropeptide signaling in dental pain, revealing a neuroimmune axis where mast cells and sensory neurons communicate through tryptase and CGRP. This is part of the broader understanding of neurogenic inflammation — the same process driving migraine headaches — occurring in the dental context. The finding that curcumin can modulate this axis suggests natural compounds may complement pharmacological approaches to managing CGRP-driven pain.
Questions still open
- Could locally applied curcumin formulations reduce CGRP-mediated dental pain in human patients?
- Does the mast cell-CGRP interaction in dental pulpitis share mechanisms with trigeminal CGRP signaling in migraine?
- Would anti-CGRP antibodies (like erenumab) be effective for managing severe dental pain?
Common questions
What does CGRP have to do with tooth pain?
Could curcumin help with dental pain?
Read the original research
Curcumin inhibits the neuroimmune response mediated by mast cells after pulpitis.
Journal of applied oral science : revista FOB, 32, e20230456
Citation
Dong, Ming; Tang, Jing; Li, Lu-Jia; Dai, Ting; Zuo, Yi-Yan; Jin, Hai-Wei. (2024). Curcumin inhibits the neuroimmune response mediated by mast cells after pulpitis.. Journal of applied oral science : revista FOB, 32, e20230456. https://doi.org/10.1590/1678-7757-2023-0456