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Stable expression of gp80 (TRPM-2, clusterin), a secretory protein implicated in programmed cell death, in
C Pilarsky1, W Haase, C Koch-Brandt
1Johannes-Gutenberg-Universität Mainz, Institut für Biochemie, Germany.
Abstract:
The gp80 (TRPM-2, clusterin) cDNA cloned into an eucaryotic expression vector, was transfected into BHK-21 cells and stably transformed cell clones were obtained. Analysis of the gp80 glycoprotein complex produced in these cells demonstrated that the complex was glycosylated, proteolytically processed and secreted in a way similar to the gp80 glycoprotein complex expressed from the endogenous gene in MDCK cells. The analysis of the viability of the cells, the morphology and the state of the DNA in the transfected cells was unchanged when compared with the untransformed cells, demonstrating that the expression of the protein failed to elicit any signs of apoptosis in this system.
Insights
Researchers successfully expressed the gp80 (clusterin) glycoprotein in BHK-21 cells. The expressed protein was functional and did not induce cell death, indicating its safety in this expression system.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- The gp80 glycoprotein, also known as TRPM-2 or clusterin, plays diverse roles in cellular functions.
- Understanding its expression and processing is crucial for various biological and therapeutic applications.
Purpose of the Study:
- To establish a stable cell line for expressing the gp80 glycoprotein.
- To characterize the post-translational modifications and secretion of the expressed gp80.
- To assess the impact of gp80 expression on cell viability and apoptosis.
Main Methods:
- Cloning of gp80 cDNA into an eukaryotic expression vector.
- Transfection and stable transformation of BHK-21 cells.
- Analysis of glycoprotein glycosylation, processing, and secretion.
- Assessment of cell viability, morphology, and DNA integrity.
Main Results:
- Stable gp80-expressing BHK-21 cell clones were successfully generated.
- The expressed gp80 glycoprotein complex exhibited proper glycosylation, proteolytic processing, and secretion.
- Expression of gp80 did not induce apoptosis or negatively affect cell viability, morphology, or DNA state.
Conclusions:
- BHK-21 cells provide a suitable system for the functional expression of the gp80 glycoprotein.
- The expressed gp80 protein is processed and secreted similarly to endogenous gp80.
- gp80 expression in this system does not trigger cellular stress or apoptosis.