NOD Signaling and Cell Death
Valentin J Heim1,2, Che A Stafford3, Ueli Nachbur1,2
1The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia.
Abstract:
Innate immune signaling and programmed cell death are intimately linked, and many signaling pathways can regulate and induce both, transcription of inflammatory mediators or autonomous cell death. The best-characterized examples for these dual outcomes are members of the TNF superfamily, the inflammasome receptors, and the toll-like receptors. Signaling via the intracellular peptidoglycan receptors NOD1 and NOD2, however, does not appear to follow this trend, despite involving signaling proteins, or proteins with domains that are linked to programmed cell death, such as RIP kinases, inhibitors of apoptosis (IAP) proteins or the CARD domains on NOD1/2. To better understand the connections between NOD signaling and cell death induction, we here review the latest findings on the molecular regulation of signaling downstream of the NOD receptors and explore the links between this immune signaling pathway and the regulation of cell death.
Insights
NOD receptors initiate innate immune responses but, unlike other immune pathways, do not typically induce programmed cell death. This review explores NOD signaling and its connection to cell death regulation.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Innate immune signaling pathways often regulate both inflammation and programmed cell death.
- Well-characterized examples include TNF superfamily members, inflammasomes, and toll-like receptors.
- NOD receptors (NOD1/2) are intracellular peptidoglycan sensors involved in innate immunity.
Purpose of the Study:
- To investigate the relationship between NOD signaling and the induction of programmed cell death.
- To review current knowledge on the molecular regulation of signaling downstream of NOD receptors.
- To explore the links between NOD immune signaling and cell death regulation.
Main Methods:
- Literature review of recent findings on NOD signaling.
- Analysis of molecular mechanisms downstream of NOD receptors.
- Exploration of connections between NOD pathway components and cell death regulators.
Main Results:
- NOD signaling, despite involving cell death-associated proteins (RIP kinases, IAPs, CARD domains), does not appear to consistently induce programmed cell death.
- The molecular regulation of signaling downstream of NOD receptors is complex.
- Specific links between NOD signaling and cell death regulation are emerging.
Conclusions:
- The connection between NOD signaling and programmed cell death is less direct than in other innate immune pathways.
- Further research is needed to fully elucidate how NOD receptors influence cell death.
- Understanding these links is crucial for comprehending innate immunity and cell fate decisions.
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