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Measuring Composition of CD95 Death-Inducing Signaling Complex and Processing of Procaspase-8 in this Complex
Published on: August 2, 2021
High cell surface death receptor expression determines type I versus type II signaling
Xue Wei Meng1, Kevin L Peterson2, Haiming Dai2
1Division of Oncology Research, Department of Oncology, Mayo Clinic, Rochester, Minnesota 55905; Department of Molecular Pharmacology, Mayo Clinic, Rochester, Minnesota 55905.
The Journal of Biological Chemistry
|August 26, 2011
Summary
The Fas receptor triggers apoptosis via two pathways: Type I and Type II. This study reveals cell surface death receptor expression levels dictate which pathway is used, clarifying the biochemical basis for this dichotomy.
Area of Science:
- Cell Biology
- Molecular Biology
- Immunology
Background:
- Apoptosis, or programmed cell death, is crucial for development and tissue homeostasis.
- Fas receptor (also known as CD95 or APO-1) ligation initiates apoptosis through distinct Type I and Type II signaling pathways.
- The underlying molecular mechanisms differentiating Type I and Type II Fas signaling have remained elusive.
Purpose of the Study:
- To elucidate the biochemical basis for the Type I/Type II dichotomy in Fas-mediated apoptosis.
- To investigate the role of cell surface death receptor expression levels in determining signaling pathway choice.
- To explore whether this dichotomy is specific to the Fas receptor or a general feature of death receptor signaling.
Main Methods:
- Quantitative analysis of Fas mRNA half-life and cell surface Fas receptor expression.
- Manipulation of Fas receptor expression levels using forced overexpression and shRNA-mediated knockdown.
- Assessment of apoptosis induction and signaling pathway activation in response to receptor modulation.
- Comparative analysis of Fas and TRAIL (TNF-α-related apoptosis-inducing ligand) signaling pathways.
- Drug-induced modulation of death receptor 5 (DR5) expression.
Main Results:
- Type I cells exhibit longer Fas mRNA half-life and higher cell surface Fas levels compared to Type II cells.
- Forced overexpression of Fas receptor in Type II cells converted signaling to Type I.
- Fas receptor downregulation in Type I cells shifted signaling towards Type II.
- The same cells could utilize Type I for Fas and Type II for TRAIL signaling, indicating receptor specificity.
- Upregulation of DR5 converted TRAIL signaling from Type II to Type I.
Conclusions:
- Cell surface death receptor expression levels are the primary determinant of the Type I/Type II signaling dichotomy.
- This mechanism is not exclusive to the Fas receptor but applies to other death receptors like TRAIL.
- Understanding this dichotomy provides insights into regulating apoptosis for therapeutic interventions.
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