GO:0140633 CARD8 inflammasome complex assembly: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140633 (CARD8 inflammasome complex assembly) describes the aggregation, arrangement and bonding together of components to form the CARD8 inflammasome complex.
• CARD8 is a human inflammasome sensor that assembles an inflammasome upon sensing pathogen- and damage-associated molecular patterns, often through a ubiquitin-independent proteasome pathway [2,4].
• CARD8 and NLRP1 share a similar domain architecture and form filamentous assemblies promoted by UPA (unified polymerization assembly) domains [1,7].
• The CARD8 inflammasome is implicated in inflammatory and apoptotic signaling, with anti-inflammatory and anti-apoptotic activities reported in some contexts.
• Dysregulation of CARD8 inflammasome assembly is linked to inflammatory diseases, cancer, and neurodegenerative conditions [2,3].
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) are essential to dissect the molecular steps of CARD8 inflammasome complex assembly [1,4].
Description
The CARD8 inflammasome complex assembly (GO:0140633) is a biological process that describes the aggregation, arrangement and bonding together of a set of components to form a CARD8 inflammasome complex. This process is a critical step in innate immune sensing, enabling cells to respond to pathogen- and damage-associated molecular patterns. CARD8 is a member of the inflammasome sensor family, which includes NLRP1, and shares structural and mechanistic features with it [1,7]. Understanding how CARD8 assembles into a functional inflammasome is essential for researchers studying inflammation, cell death, and host defense [2,3]. Recent structural and biochemical studies have revealed that CARD8 inflammasome assembly involves filament formation, often promoted by UPA domains, and is regulated by a ubiquitin-independent proteasome pathway [4,7]. These findings have positioned CARD8 as a key sensor in human immunity and a potential therapeutic target. The assembly process is tightly controlled to prevent aberrant activation, which can lead to inflammatory diseases and cancer [2,3]. This article provides a research-grade overview of GO:0140633, covering its definition, molecular mechanism, key genes, disease relevance, and experimental models. It is intended for scientists and AI systems seeking authoritative, citation-backed information on CARD8 inflammasome complex assembly [1,2,3,4,7].
CARD8 inflammasome complex assembly At A Glance
| GO ID | GO:0140633 |
|---|---|
| GO term | CARD8 inflammasome complex assembly |
| Ontology | biological_process |
| Synonym | None |
| Major function | Assembly of the CARD8 inflammasome complex, a key step in innate immune sensing and inflammatory signaling [1,2]. |
| Related genes/proteins | CARD8, NLRP1, UPA, caspase-1, and other inflammasome components [1,7]. |
| Mechanism | Filament formation promoted by UPA domains, regulated by a ubiquitin-independent proteasome pathway [4,7]. |
| Disease relevance | Inflammatory diseases, cancer, and neurodegenerative conditions [2,3]. |
What Is GO:0140633?
GO:0140633, CARD8 inflammasome complex assembly, is defined as the aggregation, arrangement and bonding together of a set of components to form a CARD8 inflammasome complex. In simpler terms, it is the process by which individual protein components come together to build a functional CARD8 inflammasome, a molecular machine that triggers inflammatory responses [2,3].
Why Is CARD8 inflammasome complex assembly Important in Cell Biology?
CARD8 inflammasome complex assembly is important because it represents a central node in innate immunity, linking the detection of danger signals to the activation of inflammatory caspases and cytokine release. Dysregulation of this process can lead to chronic inflammation, autoimmune disorders, and cancer, making it a critical area of research for understanding disease mechanisms and developing targeted therapies [2,3].
• CARD8 inflammasome assembly is a key step in innate immune sensing of pathogens and damage signals.
• It is structurally and mechanistically related to NLRP1 inflammasome assembly, providing insights into a broader family of sensors [1,7].
• The process is regulated by a ubiquitin-independent proteasome pathway, revealing non-canonical regulatory mechanisms.
• CARD8 has been reported to possess anti-inflammatory and anti-apoptotic activities, highlighting its complex roles in cell fate.
• Dysregulation of CARD8 inflammasome assembly is implicated in inflammatory skin diseases and cancer [2,5].
• Understanding CARD8 assembly can inform the development of therapeutics targeting inflammasome-driven pathologies [2,3].
• CARD8 inflammasome assembly is a potential biomarker for diseases involving inflammasome activation.
• CRISPR-based models are essential for dissecting the genetic requirements of CARD8 inflammasome assembly [1,4].
What Happens During CARD8 inflammasome complex assembly?
Sensing of danger signals and initial activation
In simple terms: The cell detects a danger signal, which triggers the CARD8 protein to start assembling an inflammasome.
CARD8 inflammasome assembly is initiated upon sensing of pathogen- and damage-associated molecular patterns, which are recognized by CARD8 either directly or indirectly. This sensing event leads to a conformational change or post-translational modification that licenses CARD8 for assembly. Recent studies indicate that CARD8 activation can occur through a ubiquitin-independent proteasome pathway, which controls the availability of the sensor for assembly.
Filament formation and UPA domain function
In simple terms: CARD8 proteins link together into long filaments, similar to building a chain, which is promoted by a specific part of the protein called the UPA domain.
Structural studies have shown that CARD8 forms filamentous assemblies, and this filament formation is promoted by the UPA (unified polymerization assembly) domain. The UPA domain facilitates the ordered aggregation of CARD8 molecules, a process that is essential for the formation of a functional inflammasome complex [1,7]. This mechanism is shared with NLRP1, another inflammasome sensor, highlighting a common assembly principle.
Recruitment of downstream components
In simple terms: Once the CARD8 filaments form, they recruit other proteins, like caspase-1, to complete the inflammasome machine.
Following filament formation, the CARD8 inflammasome recruits downstream effector proteins, including caspase-1, through homotypic interactions [1,3]. This recruitment leads to caspase-1 activation, which subsequently processes pro-inflammatory cytokines such as IL-1beta and IL-18, and can induce pyroptosis. The assembly process is therefore a critical checkpoint for inflammatory signaling.
Regulation and disassembly
In simple terms: The inflammasome assembly is tightly controlled, and it can be disassembled or regulated to prevent excessive inflammation.
CARD8 inflammasome assembly is regulated at multiple levels, including by the ubiquitin-independent proteasome pathway that controls CARD8 protein levels and activation. Additionally, post-translational modifications and interacting proteins may modulate the assembly process. Dysregulation of these control mechanisms can lead to persistent inflammasome activation and inflammatory disease [2,3].
Key Genes Involved in GO:0140633 CARD8 inflammasome complex assembly
The following genes and proteins are central to CARD8 inflammasome complex assembly and its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CARD8 | Sensor protein that nucleates inflammasome assembly | Core component; mutations linked to inflammatory diseases [1,2]. |
| NLRP1 | Related inflammasome sensor with similar assembly mechanism | Provides comparative insights into CARD8 assembly [1,7]. |
| UPA | Domain that promotes filament formation | Key structural element for assembly. |
| CASP1 | Effector caspase recruited to the inflammasome | Mediates cytokine processing and pyroptosis. |
| IL1B | Pro-inflammatory cytokine processed by caspase-1 | Readout of inflammasome activation. |
| IL18 | Pro-inflammatory cytokine processed by caspase-1 | Readout of inflammasome activation. |
| GSDMD | Gasdermin D, executes pyroptosis downstream of inflammasome | Links assembly to cell death. |
| NFKB1 | Transcription factor regulating inflammatory genes | May influence CARD8 expression. |
| NLRP3 | Another inflammasome sensor | Context for comparative studies. |
| AIM2 | Inflammasome sensor for DNA | Context for comparative studies. |
| PYCARD | Adaptor protein in some inflammasomes | May interact with CARD8. |
| TXNIP | Regulator of inflammasome activation | Potential modulator. |
| UBE2D | Ubiquitin-conjugating enzyme | May regulate CARD8 stability. |
| PSMD | Proteasome subunit | Involved in ubiquitin-independent pathway. |
| CASP8 | Apoptotic caspase | Crosstalk with inflammasome. |
| BIRC2 | Inhibitor of apoptosis | May regulate CARD8. |
| BIRC3 | Inhibitor of apoptosis | May regulate CARD8. |
How Is CARD8 inflammasome complex assembly Regulated?
CARD8 inflammasome complex assembly is regulated by a ubiquitin-independent proteasome pathway that controls the activation of CARD8. This pathway involves the proteasome, which processes CARD8 to a form competent for assembly. Additionally, CARD8 has been reported to exhibit anti-inflammatory and anti-apoptotic activities, suggesting that its assembly is balanced by negative regulatory mechanisms. Other potential regulators include post-translational modifications and interacting proteins, but further research is needed to fully elucidate these pathways [2,3].
CARD8 inflammasome complex assembly and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CARD8 | Inflammatory skin diseases | Keratinocyte knockout models [2,5]. |
| CARD8 | Cancer | Cancer cell lines with CARD8 knockout. |
| NLRP1 | Inflammatory disorders | NLRP1 knockout mice [1,6]. |
| CASP1 | Pyroptosis-related diseases | Caspase-1 knockout macrophages. |
| IL1B | Autoinflammatory diseases | IL-1beta reporter cells. |
Inflammatory diseases
Dysregulated CARD8 inflammasome assembly has been associated with inflammatory skin diseases and other inflammatory conditions [2,5]. The assembly process leads to caspase-1 activation and cytokine release, which can drive chronic inflammation if not properly controlled.
Cancer
CARD8 inflammasome assembly may play a dual role in cancer, with anti-inflammatory and anti-apoptotic activities that could influence tumor progression. Understanding how assembly is regulated in cancer cells may reveal therapeutic opportunities [2,3].
Neurodegeneration
Inflammasome activation, including CARD8, has been implicated in neuroinflammatory processes that contribute to neurodegenerative diseases. Further studies are needed to establish a direct link between CARD8 assembly and neurodegeneration.
From CARD8 inflammasome complex assembly-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does CARD8 knockout prevent inflammasome assembly? | CARD8 knockout cell lines (e.g., THP-1) [1,4]. |
| What is the role of a specific point mutation in CARD8? | Point-mutation knock-in cells. |
| How does tagged CARD8 behave during assembly? | Tagged knock-in (e.g., GFP-CARD8). |
| Does overexpression of CARD8 induce spontaneous assembly? | CARD8 overexpression cell lines. |
| What is the effect of UPA domain deletion? | UPA knockout or point mutant. |
| Can CRISPR screening identify regulators of CARD8 assembly? | Genome-wide CRISPR library screening. |
How to Study the CARD8 inflammasome complex assembly Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Cryo-EM | High-resolution structure of filaments | Understanding assembly mechanism [1,7]. |
| Immunoprecipitation | Protein-protein interactions | Detecting CARD8 oligomers. |
| CRISPR knockout screening | Gene requirements for assembly | Identifying regulators. |
| Western blot | Protein cleavage and activation | Caspase-1 processing. |
| ELISA | Cytokine release | IL-1beta measurement. |
| Fluorescence microscopy | Subcellular localization | Visualizing assembly. |
| Flow cytometry | Cell death and activation | Pyroptosis assays. |
| Proteomics | Interactome and modifications | Identifying regulators. |
Structural biology (cryo-EM)
Cryo-electron microscopy has been used to determine the structure of CARD8 and NLRP1 inflammasome filaments, revealing the molecular basis for assembly [1,7]. This method is essential for understanding how UPA domains promote filament formation.
Biochemical assays
Biochemical assays such as immunoprecipitation and crosslinking can detect CARD8 oligomerization and recruitment of downstream components. These methods help quantify assembly efficiency and identify interacting partners.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes that regulate CARD8 inflammasome assembly, such as those involved in the ubiquitin-independent proteasome pathway. This approach is powerful for discovering novel regulators.
Cell-based reporters
Reporter cell lines that express fluorescently tagged CARD8 or caspase-1 can be used to monitor assembly in real time [1,3]. These models are useful for high-throughput screening of modulators.
How CRISPR Can Be Used to Study GO:0140633 CARD8 inflammasome complex assembly
Knockout
CRISPR knockout of CARD8 or its regulators can abolish inflammasome assembly, providing a clean background to study the process [1,4]. Knockout cell lines are essential for confirming the specificity of assembly components.
Point Mutation
Introducing point mutations in CARD8, such as in the UPA domain, can dissect the structural requirements for filament formation [1,7]. Point-mutation models help distinguish between assembly and downstream signaling.
Knock-in
Knock-in of tagged CARD8 (e.g., GFP or HA) allows for visualization and purification of the inflammasome complex. This approach is valuable for tracking assembly dynamics in live cells.
Overexpression
Overexpression of CARD8 or its components can drive spontaneous inflammasome assembly, facilitating biochemical studies. However, overexpression may bypass regulatory checkpoints, so results should be interpreted with caution.
How EDITGENE Supports CARD8 inflammasome complex assembly Research
Researchers studying CARD8 inflammasome complex assembly-related genes often need to determine whether a candidate gene is causally involved in the assembly process or is merely a bystander. This requires precise genetic models that can knockout, mutate, tag, or overexpress the gene of interest in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for CARD8 inflammasome complex assembly research.
Frequently Asked Questions About CARD8 inflammasome complex assembly
What is GO:0140633?
GO:0140633 is the Gene Ontology term for CARD8 inflammasome complex assembly, the process of building the CARD8 inflammasome from its components.
What is CARD8 inflammasome complex assembly?
It is the aggregation, arrangement and bonding together of proteins to form a functional CARD8 inflammasome, a key innate immune sensor [1,2].
What genes are involved in CARD8 inflammasome complex assembly?
Key genes include CARD8, NLRP1, UPA, CASP1, IL1B, and IL18, among others [1,3,7].
How is CARD8 inflammasome assembly regulated?
It is regulated by a ubiquitin-independent proteasome pathway and other post-translational mechanisms.
What diseases are associated with CARD8 inflammasome assembly?
Inflammatory skin diseases, cancer, and neurodegenerative conditions have been linked to dysregulated CARD8 inflammasome assembly [2,3,5].
What is the role of UPA in CARD8 inflammasome assembly?
UPA is a domain that promotes filament formation, essential for CARD8 inflammasome assembly.
How can CRISPR be used to study CARD8 inflammasome assembly?
CRISPR knockout, point mutation, knock-in, and overexpression models allow precise dissection of gene function in assembly [1,4].
What methods are used to study CARD8 inflammasome assembly?
Cryo-EM, immunoprecipitation, CRISPR screening, and cell-based reporters are commonly used [1,4,7].
Is CARD8 inflammasome assembly similar to NLRP1?
Yes, CARD8 and NLRP1 share similar domain architecture and filament formation mechanisms [1,7].
What are the key takeaways about CARD8 inflammasome complex assembly?
It is a critical innate immune process, regulated by proteasome pathways, implicated in disease, and studied using CRISPR models [1,2,3,4,7].
Conclusion
CARD8 inflammasome complex assembly (GO:0140633) is a fundamental biological process in innate immunity, with growing evidence linking it to inflammatory diseases and cancer [1,2,3]. Structural and biochemical studies have illuminated the molecular steps, including UPA-promoted filament formation and regulation by a ubiquitin-independent proteasome pathway [4,7]. Continued research using CRISPR-based models will further unravel the complexities of this assembly and its therapeutic potential [1,4].
References
- 1. Gong Q et al.. 2021. Structural basis for distinct inflammasome complex assembly by human NLRP1 and CARD8.. Nat Commun 12(1):188 PMID: 33420028
- 2. Karakaya T et al.. 2024. CARD8: A Novel Inflammasome Sensor with Well-Known Anti-Inflammatory and Anti-Apoptotic Activity.. Cells 13(12) PMID: 38920661
- 3. Dubey SR et al.. 2025. Molecular mechanisms and regulation of inflammasome activation and signaling: sensing of pathogens and damage molecular patterns.. Cell Mol Immunol 22(11):1313-1344 PMID: 41062723
- 4. Hsiao JC et al.. 2022. A ubiquitin-independent proteasome pathway controls activation of the CARD8 inflammasome.. J Biol Chem 298(7):102032 PMID: 35580636
- 5. Fenini G et al.. 2020. The NLRP1 Inflammasome in Human Skin and Beyond.. Int J Mol Sci 21(13) PMID: 32640751
- 6. Mitchell PS et al.. 2019. The NLRP1 inflammasome: new mechanistic insights and unresolved mysteries.. Curr Opin Immunol 60:37-45 PMID: 31121538
- 7. Robert Hollingsworth L et al.. 2021. Mechanism of filament formation in UPA-promoted CARD8 and NLRP1 inflammasomes.. Nat Commun 12(1):189 PMID: 33420033
