Related Experiment Videos
Allergic encephalomyelitis in monkeys induced by a peptide from the A1 protein
Abstract:
A major disease-inducing site for induction of experimental allergic encephalomyelitis in monkeys exists in Peptide P 14, the 37-residue segment of the A1 protein comprising its COOH-terminus. The peptide appears to contain the dominant encephalitogenic determinant, since it was as active as the A1 protein on a molar basis. By contrast, the 9-residue tryptophan region and the Peptide R region, active in guinea pigs and rabbits, respectively, were comparatively inactive in monkeys. The clinical and histologic expression of the disease produced by Peptide P 14 appeared identical to that induced by the intact A1 protein.
Insights
A specific peptide fragment, Peptide P 14, from the A1 protein is identified as a key site for inducing experimental allergic encephalomyelitis in monkeys. This finding highlights a dominant encephalitogenic determinant for disease induction in this species.
Area of Science:
- Neuroimmunology
- Autoimmune Diseases
- Protein Chemistry
Background:
- Experimental allergic encephalomyelitis (EAE) is a model for demyelinating diseases.
- The A1 protein (also known as myelin basic protein) is implicated in EAE.
- Different regions of A1 protein are known to induce EAE in various animal models.
Purpose of the Study:
- To identify the specific encephalitogenic determinant within the A1 protein responsible for inducing EAE in monkeys.
- To compare the encephalitogenic activity of different A1 protein fragments in a primate model.
Main Methods:
- Induction of EAE in monkeys using different fragments of the A1 protein.
- Comparison of the encephalitogenic activity of Peptide P 14, the A1 protein, and other known active peptides (tryptophan region, Peptide R).
- Clinical and histological evaluation of induced EAE.
Main Results:
- Peptide P 14, a 37-residue COOH-terminal segment of A1 protein, was a major disease-inducing site for EAE in monkeys.
- Peptide P 14 exhibited encephalitogenic activity comparable to the intact A1 protein on a molar basis.
- Other regions (tryptophan region, Peptide R), active in guinea pigs and rabbits, were inactive in monkeys.
- The clinical and histological features of EAE induced by Peptide P 14 were identical to those induced by intact A1 protein.
Conclusions:
- Peptide P 14 contains the dominant encephalitogenic determinant of the A1 protein in monkeys.
- Species-specific differences exist in the recognition of A1 protein determinants for EAE induction.
- This identifies a critical target for understanding and potentially treating primate models of autoimmune encephalomyelitis.