Protein C Mutation A267T Causes Retention in the Endoplasmic Reticulum and Activates Unfolded Protein Response
Author Information
Author(s): Tjeldhorn Lena, Iversen Nina, Sandvig Kirsten, Bergan Jonas, Sandset Per Morten, Skretting Grethe
Primary Institution: Oslo University Hospital, Oslo, Norway
Hypothesis
The study aims to characterize the underlying mechanisms of the Protein C-A267T mutation associated with PC deficiency.
Conclusion
The PC-A267T mutation leads to retention in the endoplasmic reticulum, causing ER stress, UPR activation, and increased apoptosis.
Supporting Evidence
- The PC-A267T mutation was retained in the endoplasmic reticulum and associated with increased chaperone binding.
- Cells expressing PC-A267T showed elevated levels of ER stress markers BiP and P-eIF2α.
- Increased apoptotic activity was observed in cells expressing the PC-A267T mutation.
Takeaway
A mutation in a protein called Protein C makes it get stuck in a part of the cell, which causes stress and can lead to cell death.
Methodology
The study used CHO-K1 cells stably expressing either wild-type or mutant Protein C to analyze degradation pathways and ER stress markers.
Limitations
The study does not establish whether the folding defect of PC-A267T can be corrected by low temperature or chemical chaperones.
Statistical Information
P-Value
p<0.0001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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