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Decreased stability of alpha2-macroglobulin purified from patients with multiple sclerosis
M Gunnarsson1, T Stigbrand, P E Jensen
1Department of Immunology, Umeå University, Sweden.
Objectives:
To investigate conformational properties of alpha2-macroglobulin from multiple sclerosis patients.
Materials And Methods:
alpha2-macroglobulin was purified to homogeneity from plasma of 4 multiple sclerosis patients and 5 healthy controls. The plasma and the purified alpha2-macroglobulin from each individual were investigated using polyacrylamide gel electrophoresis.
Results:
Impaired stability of purified alpha2-macroglobulins from multiple sclerosis patients was demonstrated with spontaneous conversion to an electrophoretic "fast" form upon purification and following storage not ascribable to bait region cleavage.
Conclusion:
alpha2-macroglobulin from multiple sclerosis patients displays altered stability. Possible functional impairments of proteinase inhibition mechanisms are discussed.
Insights
Alpha-2-macroglobulin from multiple sclerosis patients shows reduced stability, converting to a faster form. This suggests potential impairments in proteinase inhibition mechanisms in these patients.
Area of Science:
- Biochemistry
- Immunology
- Neuroscience
Background:
- Alpha-2-macroglobulin (A2M) is a crucial plasma proteinase inhibitor.
- Alterations in A2M may be implicated in the pathogenesis of neurological disorders like multiple sclerosis (MS).
Purpose of the Study:
- To investigate the conformational properties and stability of A2M in patients with multiple sclerosis (MS).
Main Methods:
- Purification of A2M from the plasma of MS patients and healthy controls.
- Analysis of purified A2M and plasma using polyacrylamide gel electrophoresis.
Main Results:
- A2M purified from MS patients exhibited impaired stability.
- Spontaneous conversion to an electrophoretic "fast" form was observed in MS-derived A2M upon purification and storage.
- This conversion was independent of bait region cleavage.
Conclusions:
- A2M from MS patients displays altered conformational stability.
- Potential functional consequences for proteinase inhibition mechanisms in MS warrant further investigation.