Development and Function of γδT Cells in the Oral Mucosa

Area of Science:

• Immunology
• Oral Biology
• T-cell research

Background:

• Oral mucosa relies on leukocytes for homeostasis and defense against microbial/mechanical challenges.
• Gamma delta T (γδT) cells are vital tissue-resident innate lymphocytes in barrier tissues, aiding immunosurveillance and repair.
• Research on oral γδT cells is recent, with findings sometimes conflicting due to varied experimental models.

Purpose of the Study:

• To review and synthesize current literature on oral γδT cell development and function.
• To provide a balanced perspective on the role of oral γδT cells in homeostasis and oral pathologies.
• To clarify the contradictory findings regarding γδT cell involvement in conditions like periodontitis and bone loss.

Main Methods:

• Literature review and synthesis of existing studies on oral γδT cells.
• Analysis of findings from various experimental settings and transgenic mouse models.
• Discussion of data concerning γδT cell subsets (Vγ6, Vγ1, Vγ4) and their maintenance.

Main Results:

• Oral γδT cells comprise distinct subsets (tissue-resident Vγ6, circulating Vγ1/Vγ4) maintained independently.
• In the gingiva, γδT cells are strategically located near dental plaque and are a major IL-17 source.
• Conflicting data exists on γδT cell roles in age-associated bone loss and experimental periodontitis.

Conclusions:

• Oral γδT cells play a complex role in maintaining oral homeostasis and responding to pathologies.
• Further research is needed to reconcile conflicting data and fully elucidate their functions in oral health and disease.
• Understanding oral γδT cell subsets and their specific contributions is crucial for targeted therapeutic strategies.