Luteolin Is a Potential Immunomodulating Natural Compound against Pulpal Inflammation

Area of Science:

• Dental Pulp Biology
• Inflammation Research
• Biomaterials Science

Background:

• Dental pulp-derived microvesicles (MVs) can mediate inflammation, contributing to pulpitis.
• Protein kinase R (PKR) plays a key role in mediating inflammatory responses.
• Identifying therapeutic agents to modulate MV-induced inflammation is crucial for pulp preservation.

Purpose of the Study:

• To evaluate the therapeutic potential of luteolin in alleviating dental pulpitis.
• To investigate luteolin's mechanism of action via inhibition of PKR-mediated inflammation.
• To assess luteolin's efficacy in preclinical models of pulpitis and periodontal bone loss.

Main Methods:

• Proteomic analysis of dental pulp-derived MVs to identify PKR-associated molecules.
• In vitro studies assessing luteolin's effect on PKR phosphorylation and TNF-α expression.
• In vivo evaluation in dog models of experimental pulpitis and mouse models of endodontic-periodontal complex lesions.

Main Results:

• Luteolin inhibited pPKR and TNF-α expression with minimal impact on cell proliferation.
• In canine pulpitis models, luteolin reduced pPKR, MPO, and CD68 positive cells.
• Luteolin treatment significantly decreased MV-induced alveolar bone resorption in mice.

Conclusions:

• Luteolin is an effective and safe therapeutic agent for inhibiting PKR activation in dental pulp-derived MVs.
• Luteolin demonstrates potential for pulp preservation and mitigating inflammatory bone loss.
• The findings support luteolin as a promising compound for managing dental pulp inflammation.