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Absence of detectable IL-1beta production in murine prion disease: a model of chronic neurodegeneration
D T Walsh1, S Betmouni, V H Perry
1University Department of Pharmacology, Oxford, United Kingdom.
Abstract:
Murine prion disease is accompanied by a modified inflammatory response characterized by early but prolonged microglial activation and T-lymphocyte recruitment. In this model, we look at the profile of cytokine production, particularly IL-1beta. Mice inoculated with prion-infected brain homogenate show typical signs of prion disease. We were unable to detect any IL-1beta using immunohistochemistry, with various fixation protocols, or ELISA between 8 and 24 wk post-inoculation. Also, there was no increase in mRNA for IL-1beta, IL-6, IFNgamma, and iNOS as measured by quantitative RT-PCR. Using the same procedures and examining tissues at the same time, IL-1beta immunostaining was detected in infiltrating inflammatory cells in mouse brains injected with LPS or in a delayed-type hypersensitivity response in the brain. Soluble IL-1beta was also increased, as measured by ELISA, and there was an increase in mRNA species for IL-1beta, IL-6, TNFalpha but not IFNgamma or iNOS in these brains. These data reveal that chronic neurodegeneration seen in prion disease does not induce production of a range of proinflammatory mediators despite showing marked microglial activation and raise the question as to whether IL-1beta would exacerbate the neurodegeneration as it does in acute neurodegeneration following head injury and stroke.
Insights
Chronic neurodegeneration in prion disease does not elevate key inflammatory cytokines like IL-1beta, despite significant microglial activation. This suggests a unique inflammatory profile in prion diseases compared to acute neurological injuries.
Area of Science:
- Neuroimmunology
- Prion Diseases
- Neuroinflammation
Background:
- Murine prion disease involves microglial activation and T-lymphocyte recruitment.
- The role of specific cytokines, particularly IL-1beta, in prion disease pathogenesis is not fully understood.
Purpose of the Study:
- To investigate the production profile of IL-1beta and other inflammatory mediators during chronic prion disease progression in mice.
- To compare the inflammatory response in prion disease with acute inflammatory conditions in the brain.
Main Methods:
- Mice were inoculated with prion-infected brain homogenate.
- Immunohistochemistry and ELISA were used to detect IL-1beta protein.
- Quantitative RT-PCR measured mRNA levels of IL-1beta, IL-6, IFNgamma, and iNOS.
- Control experiments involved LPS injection and delayed-type hypersensitivity response.
Main Results:
- No detectable IL-1beta protein or mRNA increase was observed in prion-diseased mouse brains.
- IL-1beta was detected in control inflammatory conditions (LPS, DTH response).
- Elevated soluble IL-1beta and specific inflammatory mRNA were found in control conditions, unlike in prion disease.
Conclusions:
- Chronic neurodegeneration in prion disease does not induce significant IL-1beta production despite microglial activation.
- The inflammatory response in prion disease differs markedly from acute neurodegeneration.
- Further research is needed to determine if IL-1beta exacerbates prion-induced neurodegeneration.
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