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Pristane-induced autoimmunity in germ-free mice
Akiei Mizutani1, Victoria M Shaheen, Hideo Yoshida
1Division of Rheumatology and Clinical Immunology, Department of Medicine, University of Florida, Gainesville, FL 32610-0221, USA.
Clinical Immunology (Orlando, Fla.)
|January 11, 2005
Summary
Pristane-induced lupus autoantibodies and disease features develop even without microbial stimulation. These findings show pristane is not solely acting through microbial products like LPS.
Area of Science:
- Immunology
- Autoimmunity
- Microbiology
Background:
- Microbial stimulation is implicated in pristane-induced lupus models.
- Previous studies suggest a role for microbial products in disease development.
Purpose of the Study:
- To determine if microbial stimulation is essential for pristane-induced lupus autoimmunity.
- To investigate the role of pristane independent of microbial exposure.
Main Methods:
- BALB/c mice were housed under germ-free conditions.
- Mice received intraperitoneal injections of sterile PBS or pristane.
- Peritoneal cells were stimulated with LPS or anti-CD3.
- Autoantibodies were detected via immunoprecipitation.
Main Results:
- Pristane-treated germ-free mice developed peritoneal granulomas and hypergammaglobulinemia.
- Increased IgG2a/IgG1 ratios were observed in pristane-treated mice.
- Cytokine production (IL-6, IL-12, TNF-alpha, IFN-gamma, IL-4) was enhanced.
- Anti-nRNP/Sm and anti-Su autoantibodies were detected in pristane-treated germ-free mice.
Conclusions:
- Bacterial stimulation is not required for lupus autoantibodies, granuloma formation, or hypergammaglobulinemia.
- Pristane-induced autoimmunity is not solely mediated by microbial products like LPS.
- Microbial stimulation acts synergistically with pristane but is not the sole driver.