| Property | Value | |----------|-------| | Pathway | PANoptosis | | Full Name | Pyroptosis-Apoptosis-Necroptosis | | Key Proteins | ZBP1, NLRP3, ASC, CASP1, CASP8, RIPK1, RIPK3, MLKL | | Cell Death Type | Programmed cell death (hybrid) | | Discovery | 2016 (Karki et al.) |
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Overview
PANoptosis (Pyroptosis-[Apoptosis](/entities/apoptosis)) is a unique programmed cell death pathway that involves the coordinated activation of pyroptosis, apoptosis, and [necroptosis](/entities/necroptosis)[@karki2021]. Unlike traditional cell death pathways that operate independently, PANoptosis represents an interconnected inflammatory cell death program that cannot be classified into any single cell death category. This hybrid cell death pathway has emerged as a critical mechanism in neurodegenerative diseases, where it contributes to neuronal loss and disease progression[@lee2023].
Molecular Mechanisms
PANoptosome Complex
The PANoptosome is a large multiprotein complex that serves as the central hub for PANoptosis activation[@karki2021]:
```mermaid flowchart TD A["ZBP1<br/>Z-DNA Binding Protein 1"] --> B["PANoptosome Complex"] C["NLRP3"] --> B D["ASC<br/>PYCARD"] --> B E["RIPK1"] --> B F["RIPK3"] --> B
B --> G["Caspace-1"] B --> H["Caspace-8"] B --> I["Caspace-3/7"]
G --> J["Pyroptosis<br/>Gasdermin D"] H --> K["Apoptosis<br/>Caspase-3/7"] I --> K B --> L["Necroptosis<br/>ML KL"]
...
PANoptosis in Neurodegeneration
<div class="infobox infobox-mechanism">
| Property | Value | |----------|-------| | Pathway | PANoptosis | | Full Name | Pyroptosis-Apoptosis-Necroptosis | | Key Proteins | ZBP1, NLRP3, ASC, CASP1, CASP8, RIPK1, RIPK3, MLKL | | Cell Death Type | Programmed cell death (hybrid) | | Discovery | 2016 (Karki et al.) |
</div>
Overview
PANoptosis (Pyroptosis-[Apoptosis](/entities/apoptosis)) is a unique programmed cell death pathway that involves the coordinated activation of pyroptosis, apoptosis, and [necroptosis](/entities/necroptosis)[@karki2021]. Unlike traditional cell death pathways that operate independently, PANoptosis represents an interconnected inflammatory cell death program that cannot be classified into any single cell death category. This hybrid cell death pathway has emerged as a critical mechanism in neurodegenerative diseases, where it contributes to neuronal loss and disease progression[@lee2023].
Molecular Mechanisms
PANoptosome Complex
The PANoptosome is a large multiprotein complex that serves as the central hub for PANoptosis activation[@karki2021]:
Mermaid diagram (expand to render)
Key Molecular Components
Sensors and Initiators
ZBP1 (Z-DNA binding protein 1): Intracellular Z-nucleic acid sensor that recognizes viral RNA and endogenous retroelements[@rebsamen2021]
NLRP3 (NLR family pyrin domain containing 3): Inflammasome component that detects cellular stress and damage signals[@liu2020]
AIM2 (Absent in melanoma 2): DNA sensor that activates inflammasome in response to cytosolic DNA
Adaptor Proteins
ASC (PYCARD): Adaptor protein linking sensor activation to caspase-1
FADD: Adaptor for death receptor signaling to caspase-8
Effector Caspases
Caspase-1: Master regulator of pyroptosis; processes pro-IL-1β, pro-IL-18, and gasdermin D[@liu2020]
Caspase-8: Key mediator of extrinsic apoptosis and regulator of necroptosis
Caspase-3/7: Executioner caspases of apoptosis
Necroptosis Effectors
RIPK1 (Receptor-interacting protein kinase 1): Upstream kinase regulating both apoptosis and necroptosis[@degterev2022]
RIPK3: Key mediator of necroptosis; phosphorylates MLKL
MLKL (Mixed lineage kinase domain-like): Executioner of necroptosis; forms pores in plasma membrane
Activation Triggers
PANoptosis can be triggered by multiple stimuli[@lee2023]: