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Experimental allergic neuritis in the Lewis rat.
Journal of Neuropathology and Experimental Neurology
|July 1, 1979
Summary
Lewis rats injected with peripheral nervous system myelin from various species developed experimental allergic neuritis (EAN). Guinea pig myelin also induced experimental allergic encephalomyelitis (EAE), but P2 protein levels did not correlate with EAN severity.
Area of Science:
- Neuroimmunology
- Demyelinating Diseases
- Comparative Pathology
Background:
- Experimental allergic neuritis (EAN) and experimental allergic encephalomyelitis (EAE) are animal models for demyelinating diseases of the peripheral nervous system (PNS) and central nervous system (CNS), respectively.
- The Lewis rat is a common model for EAE, particularly when sensitized with guinea pig CNS myelin.
- Understanding the immunogenic properties of myelin from different species and its impact on EAN/EAE induction is crucial for studying autoimmune neurological disorders.
Purpose of the Study:
- To investigate the potential of peripheral nervous system (PNS) myelin from various species to induce experimental allergic neuritis (EAN) and experimental allergic encephalomyelitis (EAE) in Lewis rats.
- To analyze the correlation between myelin protein composition, specifically P2 protein content, and the severity of induced EAN.
- To compare the immunogenicity of PNS myelin from different species in the Lewis rat model.
Main Methods:
- Purified PNS myelin from guinea pig, frog, rat, rabbit, beef, and human was injected into Lewis rats.
- Rats were monitored for clinical signs and pathological lesions in the PNS and CNS.
- Myelin proteins were separated using polyacrylamide gel electrophoresis, scanned, and quantified to determine P2 protein levels.
Main Results:
- Injection of frog PNS myelin did not induce EAN or EAE.
- PNS myelin from rat, rabbit, beef, and human successfully induced EAN.
- Guinea pig PNS myelin induced both EAN and EAE, suggesting a broader autoimmune response.
- No clear correlation was found between the amount of P2 protein in the myelin and the severity of EAN symptoms.
Conclusions:
- Peripheral nervous system myelin from multiple species can induce EAN in Lewis rats.
- Guinea pig PNS myelin exhibits a unique capacity to induce both EAN and EAE in this model.
- The P2 protein content alone does not predict the severity of EAN, indicating other factors contribute to disease induction.