Comprehensive Insight into Lichen Planus Immunopathogenesis

Area of Science:

• Immunodermatology
• Oral Medicine
• Genetics

Background:

• Lichen planus affects skin, appendages, and mucous membranes, impacting quality of life.
• Cutaneous lichen planus is rare (<1% population), while oral lichen planus is more prevalent.
• Disease etiology is not fully understood but involves immune-mediated mechanisms.

Purpose of the Study:

• To provide a comprehensive overview of current lichen planus knowledge.
• To discuss causal genetic and environmental factors.
• To describe the immunopathogenesis and inflammatory pathways.

Main Methods:

• Review of existing literature on lichen planus.
• Analysis of genetic predisposition and environmental triggers.
• Description of immunological mechanisms and cellular players.

Main Results:

• Immune-mediated mechanisms are central to lichen planus pathogenesis.
• Cytotoxic T lymphocytes, Th1, and the IL-23/Th-17 axis are key effectors.
• Environmental factors (infections, stress, microbiome) can trigger disease in susceptible individuals.

Conclusions:

• Lichen planus pathogenesis is complex, involving genetic susceptibility and environmental triggers.
• Cell-mediated cytotoxicity and specific inflammatory pathways are crucial.
• Further research can elucidate precise mechanisms for targeted therapies.