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GABA(B) receptor heterodimer-component localisation in human brain.

A Billinton¹, A O Ige, A Wise

¹Department of Neurobiology, Babraham Institute, Babraham, UK. andrew.billinton@bbsrc.ac.uk

Brain Research. Molecular Brain Research

|May 18, 2000

Summary

Functional GABA(B) receptors require heterodimerization of GABA(B)R1 and GABA(B)R2. This study confirms their co-localization in human brain tissue, suggesting in vivo heterodimerization.

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Area of Science:

Neuroscience
Molecular Biology
Biochemistry

Background:

Functional GABA(B) receptors are G-protein coupled receptors.
Recombinant cell lines show GABA(B) receptors form via heterodimerization of GABA(B)R1 and GABA(B)R2.
Individual subunits do not form fully functional receptors.

Purpose of the Study:

To investigate if GABA(B) receptor heterodimerization occurs in vivo.
To determine the distribution of GABA(B)R1 and GABA(B)R2 protein subunits in human brain tissue.

Main Methods:

Raised novel polyclonal antibodies against the C termini of GABA(B)R1 and GABA(B)R2 in different species.
Characterized antibodies for specificity.
Utilized immunohistochemistry and double immunofluorescence labeling on human brain tissue.

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Main Results:

GABA(B)R1 and GABA(B)R2 proteins were detected in multiple human brain regions, including cerebellum, hippocampus, cortex, thalamus, basal ganglia, pons, and medulla.
Double immunofluorescence confirmed co-localization of GABA(B)R1 and GABA(B)R2 in the human cerebellar cortex.
These findings indicate the presence of both subunits within the same cells.

Conclusions:

GABA(B) receptors are widely distributed throughout the human brain.
The co-localization of GABA(B)R1 and GABA(B)R2 subunits in human brain cells suggests they function as heterodimers in vivo.
This supports the physiological relevance of GABA(B) receptor heterodimerization.