Possible Triggering of Molecular Mimicry by Environmental Pollution

Area of Science:

• Environmental Science
• Immunology
• Toxicology

Background:

• The molecular mimicry theory posits that infections trigger autoimmune diseases by activating self-reactive immune cells.
• Global autoimmune disease incidence is rising despite reduced infectious disease burdens, creating a paradox.
• The role of environmental factors in this rising incidence remains unclear.

Purpose of the Study:

• To investigate the impact of environmental pollutants on autoimmune disease susceptibility.
• To test the hypothesis that environmental pollutants can induce autoimmune responses via molecular mimicry.

Main Methods:

• Analysis of benzo[a]pyrene (BaP) exposure in autoimmune-prone MRL mice.
• Gene expression analysis in spleen and kidney tissues.
• Bioinformatic analysis to identify homology between induced proteins and bacterial pathogens.

Main Results:

• Benzo[a]pyrene exposure induced gene expression in MRL mice.
• The protein products of BaP-induced genes exhibited homology to bacterial pathogens.
• This mimicry was observed in spleen and kidney tissues.

Conclusions:

• Environmental pollutants, specifically benzo[a]pyrene, may contribute to autoimmune diseases.
• Pollutants can potentially mimic pathogen invasion, activating autoreactive immune cells.
• This finding offers a new perspective on the rising incidence of autoimmune diseases.