Related Experiment Videos
Cloning and expression of the programmed cell death regulator Bad in the rat brain
V D'Agata1, G Magro, S Travali
1Istituto di Bioimmagini e Fisiopatologia del Sistema Nervoso Centrale, Italian National Research Council, Catania.
Abstract:
The Bcl-2 family of proteins consists of both antagonists (e.g. Bcl-2) and agonists (e.g. Bax) that regulate apoptosis and compete through dimerization. In the present study we cloned the cDNA encoding the rat brain BAD, a distant member of the Bcl-2 family that was shown to promote cell death. The cloned cDNA encoded a protein of 205 amino acids, containing three putative Bcl-2 homology domains (BH1, BH2 and BH3) and no C-terminal signal-anchor sequence. The predicted amino acid sequence was identical to the Bad-cDNA recently cloned from the rat ovary with the exception of a stretch of six amino acids, thus indicating the existence of two Bad alternative splice variants or a sequence artifact in the rat ovary Bad-cDNA. Immunohistochemical analysis in the rat brain revealed the exclusive expression of Bad in the epithelial cells of the choroid plexus, a result which is consistent with a very specialized function of Bad in the brain.
Insights
Researchers cloned rat brain BAD, a protein promoting cell death. This Bcl-2 family member, crucial for apoptosis regulation, was exclusively found in the brain's choroid plexus epithelial cells.
Area of Science:
- Molecular Biology
- Cell Biology
- Neuroscience
Background:
- The Bcl-2 protein family regulates apoptosis, with members acting as antagonists or agonists.
- BAD is a pro-apoptotic protein and a distant member of the Bcl-2 family.
Purpose of the Study:
- To clone and characterize the rat brain BAD cDNA.
- To investigate the expression pattern of BAD in the rat brain.
Main Methods:
- cDNA cloning of rat brain BAD.
- Bioinformatic analysis of the predicted amino acid sequence.
- Immunohistochemical analysis of BAD expression in rat brain tissue.
Main Results:
- The cloned rat brain BAD cDNA encodes a 205-amino acid protein with BH1, BH2, and BH3 domains.
- The rat brain BAD sequence differs slightly from rat ovary BAD, suggesting alternative splicing or artifact.
- Immunohistochemistry revealed exclusive BAD expression in the choroid plexus epithelial cells.
Conclusions:
- Rat brain BAD is a distinct protein involved in apoptosis.
- The specific expression of BAD in the choroid plexus suggests a specialized role in brain function.