Arthritis and Foodborne Bacteria

Area of Science:

• Immunology
• Rheumatology
• Microbiology

Background:

• Diarrheal illnesses from pathogens like Campylobacter, Salmonella, Shigella, and Yersinia can precipitate sterile arthritis.
• Reactive arthritis, Reiter's syndrome, and ankylosing spondylitis are known sequelae of bacterial food poisoning.
• A strong familial link exists between these arthritides and the human leucocyte antigen (HLA)-B27 gene.

Purpose of the Study:

• To explore the mechanisms linking bacterial infections to the development of reactive arthritis.
• To understand why HLA-B27-positive individuals are more susceptible to developing arthritis after infection.
• To investigate the role of immune responses, molecular mimicry, and autoimmunity in the pathogenesis of these conditions.

Main Methods:

• Review of literature on bacterial food poisoning outbreaks and associated arthritides.
• Analysis of immunological findings in patients with reactive arthritis, including T-cell responses and antibody presence.
• Examination of evidence for molecular mimicry between bacterial antigens and HLA-B27.

Main Results:

• Bacterial antigens, but not whole bacteria, are found in the joints of affected individuals.
• T-cells from arthritic patients' joints specifically recognize triggering bacterial pathogens and respond to bacterial and human heat shock proteins.
• Molecular mimicry between HLA-B27 and bacterial antigens is a proposed mechanism for disease initiation.

Conclusions:

• The development of reactive arthritis following bacterial infections is complex, involving immune responses directed at bacterial components.
• Molecular mimicry and potential autoimmune mechanisms involving heat shock proteins are implicated in HLA-B27-associated arthritis.
• While a small percentage of infected individuals develop arthritis, it causes significant suffering and economic burden.