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Vascular proteomics and subtractive antibody expression cloning
Eric V Shusta1, Ruben J Boado, William M Pardridge
1Department of Medicine, UCLA School of Medicine, Los Angeles, California 90024, USA.
Molecular & Cellular Proteomics : MCP
|July 4, 2002
Summary
Researchers developed a novel subtractive expression cloning method to identify brain microvasculature proteins. This technique aids in understanding disease and targeting therapies by revealing tissue-specific membrane proteins.
Area of Science:
- Proteomics
- Molecular Biology
- Vascular Biology
Background:
- Differential protein expression in organ microvasculature is crucial for disease analysis and targeted drug delivery.
- Existing methods lack specificity for identifying tissue-specific microvascular proteins, particularly membrane proteins.
Purpose of the Study:
- To develop and validate a novel methodology for analyzing differential protein expression in the brain microvasculature.
- To enable the cloning of cDNAs encoding tissue-specific membrane proteins from microvasculature.
Main Methods:
- A subtractive expression cloning system was developed, merging tissue-specific polyclonal antiserum with a cDNA library expression cloning system.
- Antiserum was depleted of antibodies recognizing common proteins by subtraction with control tissue extracts.
- The depleted antiserum was used to screen a bovine brain capillary cDNA library expressed in COS cells.
Main Results:
- The methodology successfully identified the Lutheran membrane glycoprotein, specifically expressed in the brain microvasculature.
- This protein was found to be differentially expressed compared to liver and kidney tissues.
- The technique demonstrated effectiveness in detecting microvasculature-specific proteins.
Conclusions:
- The subtractive expression cloning methodology offers a new approach to vascular proteomics.
- This method facilitates the detection and cloning of proteins, including membrane proteins, specifically expressed in the microvasculature.
- The technique is applicable to various organs for identifying tissue-specific proteins.