Behçet's disease causes
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Hamid Qazi, MD, BSc [2]Dheeraj Makkar, M.D.[3]
Overview
The cause of Behçet disease has not been identified. To review risk factors for the development of Behçet disease, click here.
Causes
The cause of Behçet disease has not been identified. To review risk factors for the development of Behçet disease, click here. Behçet’s syndrome is a complex, multifactorial disorder in which both genetic predisposition and environmental triggers interact to produce immune dysregulation and widespread vascular inflammation.
- Genetic Factors
HLA-B*51: The first and strongest genetic association, particularly the HLA-B*51:01 subtype, confers about a sixfold higher risk of developing Behçet’s syndrome.
Other immune-related genes: Genome-wide association studies have identified additional susceptibility loci, including:
ERAP1 (involved in antigen processing and presentation).
IL23R–IL12RB2, STAT4, and IL10 (linked to polarization of Th1 and Th17 responses).
KLRC4 (regulation of natural killer cell activity).
CCR1–CCR3 (chemotaxis).
Autoinflammatory genes: Variants in TNFAIP3 (A20 haploinsufficiency) and MEFV (familial Mediterranean fever gene) suggest shared mechanisms with other monogenic inflammatory disorders.
Epigenetics: Studies have shown aberrant DNA methylation and abnormal histone activation marks in immune cells, further enhancing inflammatory responses .
- Environmental and Microbial Triggers
Microorganisms: Bacteria (e.g., Streptococcus species), viruses (e.g., HSV-1), and their byproducts have been implicated as potential initiating factors.
Dietary factors: Histamine-releasing foods such as citrus fruits, nuts, and cheese may precipitate flares.
Lifestyle and local factors: Poor oral hygiene and psychological stress have been proposed as contributing triggers.
Microbiome imbalance: Alterations in gut and salivary flora (dysbiosis) have been repeatedly observed, suggesting that microbial antigens may stimulate abnormal immune activation .
- Immune Dysregulation
Behçet’s syndrome displays both autoimmune and autoinflammatory features.
Adaptive immunity:
Hyperactive Th1 and Th17 responses lead to overproduction of proinflammatory cytokines such as TNF-α, IFN-γ, IL-17, and IL-23.
Regulatory T-cell activity is diminished, reducing immune tolerance.
Innate immunity:
Neutrophils are the predominant infiltrating cells, generating reactive oxygen species and releasing neutrophil extracellular traps (NETs), which contribute to vascular inflammation and thrombosis.
NF-κB pathway: Heightened signaling in antigen-presenting cells, T cells, and neutrophils amplifies the inflammatory cascade