Autoimmune disease triggered by infection with alphaproteobacteria

Area of Science:

• Microbiology
• Immunology
• Hepatology

Background:

• Autoimmune diseases are complex, with microbial triggers being a long-standing hypothesis.
• Primary biliary cirrhosis (PBC) is a chronic liver disease of unknown etiology.

Purpose of the Study:

• To investigate the potential role of microbial infections in driving autoimmune conditions.
• To explore the association between Novosphingobium aromaticivorans and primary biliary cirrhosis (PBC).

Main Methods:

• Identified Novosphingobium aromaticivorans in patients with PBC.
• Confirmed the association in a mouse model of Novosphingobium infection.
• Analyzed liver lesions and antibody production in infected mice.

Main Results:

• Novosphingobium aromaticivorans was specifically associated with PBC patients.
• Infection in mice led to PBC-like liver lesions.
• Mice produced antibodies cross-reactive with bacterial and host antigens (PDC-E2).

Conclusions:

• Novosphingobium aromaticivorans is a potential infectious trigger for primary biliary cirrhosis.
• This finding could revolutionize the understanding of autoimmune disease etiology.
• Suggests novel diagnostic and therapeutic strategies for autoimmune syndromes.