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Blood-brain barrier genomics
J Y Li1, R J Boado, W M Pardridge
1Department of Medicine, UCLA School of Medicine, Los Angeles, California 90095-1682, USA.
Summary
Researchers identified novel genes selectively expressed at the blood-brain barrier (BBB) using a specialized gene microarray. This discovery offers new targets for brain drug delivery and understanding neurological diseases.
Area of Science:
- Neuroscience
- Molecular Biology
- Genomics
Background:
- The blood-brain barrier (BBB) is crucial for brain function, regulated by unique gene expression in brain microvascular endothelial cells.
- Understanding tissue-specific gene expression at the BBB is key to developing targeted brain therapies.
Purpose of the Study:
- To develop a gene microarray specific for the BBB.
- To identify novel genes selectively expressed at the BBB.
Main Methods:
- Purified mRNA from rat brain capillaries to create tester cDNA.
- Utilized suppression subtractive hybridization (SSH) to subtract liver and kidney cDNA.
- Screened subtracted tester cDNA to identify BBB-specific gene products.
Main Results:
- Identified 50 gene products from screening 5% of subtracted cDNA.
- Over 80% of identified genes were selectively expressed at the BBB.
- Discovered novel gene sequences and known genes with previously unknown selective BBB expression, including tissue plasminogen activator and organic anion transporting polypeptide type 2.
Conclusions:
- This study established a BBB-specific gene microarray approach.
- Identified numerous novel and known genes selectively expressed at the BBB.
- Findings provide potential targets for enhancing brain drug delivery and elucidating microvascular brain pathology mechanisms.