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Molecular detection of interferon-alpha expression in multiple sclerosis brain
E R Brandt1, I R Mackay, P J Hertzog
1Centre for Molecular Biology and Medicine, Monash University, Clayton, Vic., Australia.
Insights
Interferon-alpha gene expression was detected in brain tissue of multiple sclerosis patients. However, this expression was also found in other neurological and non-neurological diseases, suggesting it is not specific to multiple sclerosis.
Area of Science:
- Neuroimmunology
- Molecular Biology
- Genetics
Background:
- Interferon-alpha (IFN-α) has been observed intermittently in multiple sclerosis (MS) patients.
- This observation prompted an investigation into the molecular basis of IFN-α in neural tissue.
Purpose of the Study:
- To analyze brain tissue for the expression of interferon-alpha genes in multiple sclerosis patients.
- To determine if IFN-α gene expression is specifically elevated in MS.
Main Methods:
- Development of a sensitive polymerase chain reaction (PCR) method.
- Utilized primer sets to amplify all IFN-α subtypes or specific subtypes (IFN-α 2 and IFN-α 4).
- Analysis of brain and non-brain tissues from patients.
Main Results:
- IFN-α gene expression was detected in brain and non-brain tissues of most multiple sclerosis patients.
- Similar expression levels were observed in patients with other neurological diseases and non-neurological conditions.
- The study did not reveal amplified IFN-α expression specifically in multiple sclerosis.
Conclusions:
- Constitutive expression of interferon-alpha genes can occur in brain tissue.
- The study did not provide evidence for amplified IFN-α expression as a specific marker for multiple sclerosis.
- Further research may be needed to explore the role of IFN-α in MS pathogenesis.
Abstract:
The demonstration of intermittent interferonaemia in patients with multiple sclerosis prompted a molecular analysis of brain tissue for expression of interferon-alpha genes. A sensitive method was developed based on the polymerase chain reaction. Primer sets were used that could amplify all interferons-alpha or two particular subtypes, interferon-alpha 2 and interferon-alpha 4. The procedure was successful in detecting expression of interferons-alpha in brain and non-brain tissues in most patients with multiple sclerosis. However, expression was demonstrable also in a similar proportion of patients with other neural diseases, and patients with other illnesses. The data indicate that there can be constitutive expression of interferons-alpha in brain tissue, but the possibility that this becomes amplified in multiple sclerosis was not revealed by this study.
