<div class="infobox infobox-protein"> | | | |---|---| | Protein Name | CARD14 Protein | | Gene | [CARD14](/genes/card14) | | UniProt ID | [Q9BXX4](https://www.uniprot.org/uniprot/Q9BXX4) | | Alternative Names | Caspase Recruitment Domain Family Member 14, CARMA2 | | Molecular Weight | ~125 kDa | | Structure | N-terminal coiled-coil domain, CARD domain, MAGUK domain | | Subcellular Localization | Plasma membrane, endoplasmic reticulum | </div>
Overview
CARD14 (Caspase Recruitment Domain Family Member 14), also known as CARMA2, is a scaffolding protein that plays a critical role in [NF-κB](/entities/nf-kb) signaling pathways[@jordaan2020]. Originally identified as a regulator of T cell activation, CARD14 has emerged as an important player in neuroinflammation and neurodegenerative diseases through its regulation of inflammatory gene expression[@chen2022].
Molecular Function
Scaffold Protein Activity
CARD14 functions primarily as a molecular scaffold that assembles signaling complexes:
Coiled-coil domain: Mediates homomeric and heteromeric interactions with other CARD-containing proteins
CARD domain: Caspase recruitment domain for apoptotic and inflammatory signaling
MAGUK domain: Provides scaffolding for membrane-associated signaling complexes
NF-κB Activation
...
CARD14 Protein
<div class="infobox infobox-protein"> | | | |---|---| | Protein Name | CARD14 Protein | | Gene | [CARD14](/genes/card14) | | UniProt ID | [Q9BXX4](https://www.uniprot.org/uniprot/Q9BXX4) | | Alternative Names | Caspase Recruitment Domain Family Member 14, CARMA2 | | Molecular Weight | ~125 kDa | | Structure | N-terminal coiled-coil domain, CARD domain, MAGUK domain | | Subcellular Localization | Plasma membrane, endoplasmic reticulum | </div>
Overview
CARD14 (Caspase Recruitment Domain Family Member 14), also known as CARMA2, is a scaffolding protein that plays a critical role in [NF-κB](/entities/nf-kb) signaling pathways[@jordaan2020]. Originally identified as a regulator of T cell activation, CARD14 has emerged as an important player in neuroinflammation and neurodegenerative diseases through its regulation of inflammatory gene expression[@chen2022].
Molecular Function
Scaffold Protein Activity
CARD14 functions primarily as a molecular scaffold that assembles signaling complexes:
Coiled-coil domain: Mediates homomeric and heteromeric interactions with other CARD-containing proteins
CARD domain: Caspase recruitment domain for apoptotic and inflammatory signaling
MAGUK domain: Provides scaffolding for membrane-associated signaling complexes
NF-κB Activation
CARD14 activates NF-κB signaling through assembly of a signaling cascade:
CARD14 recruits BCL10 and MALT1 to form the CBM complex
IκB kinase (IKK) activation leads to NF-κB nuclear translocation[@jordaan2020]
Role in Neurodegenerative Diseases
Alzheimer's Disease
CARD14 contributes to Alzheimer's disease pathogenesis through:
Neuroinflammation: CARD14-mediated NF-κB activation drives expression of pro-inflammatory cytokines (IL-1β, TNF-α, IL-6) in glial cells[@chen2022]. Chronic neuroinflammation is a hallmark of AD.
Amyloid Processing: NF-κB regulated genes can influence [amyloid precursor protein](/entities/app-protein) (APP) processing and [amyloid-beta](/proteins/amyloid-beta) production.
[Blood-Brain Barrier](/entities/blood-brain-barrier): CARD14 signaling may affect BBB permeability through regulation of inflammatory mediators.
Microglial Activation: CARD14 expression in [microglia](/cell-types/microglia-neuroinflammation) modulates their inflammatory response to amyloid deposits.
Parkinson's Disease
In Parkinson's disease, CARD14 contributes to:
Dopaminergic Neuron Vulnerability: NF-κB activation in dopaminergic [neurons](/entities/neurons) can promote [apoptosis](/entities/apoptosis) and enhance vulnerability to [α-synuclein](/proteins/alpha-synuclein) toxicity.
Microglial Activation: CARD14-mediated inflammation in microglia contributes to chronic neuroinflammation in the substantia nigra.
α-Synuclein Pathology: Inflammatory pathways activated by CARD14 may accelerate α-synuclein aggregation and propagation.
Amyotrophic Lateral Sclerosis
CARD14 involvement in ALS includes:
Motor Neuron Injury: NF-κB activation in motor neurons and surrounding glia contributes to excitotoxicity and oxidative stress.
Astrocyte Reactivity: CARD14 signaling in [astrocytes](/entities/astrocytes) promotes secretion of inflammatory mediators that harm motor neurons.
[TDP-43](/mechanisms/tdp-43-proteinopathy) Pathology: Inflammatory pathways may interact with TDP-43 proteinopathy in ALS.
Signaling Pathways
CARD14 interfaces with multiple signaling pathways:
Canonical NF-κB Pathway: CARD14 is a key activator of classical NF-κB signaling
MAPK Pathways: Cross-talk with JNK and p38 signaling
Inflammasome Pathways: Interaction with [NLRP3](/entities/nlrp3-inflammasome) and other inflammasome components
Therapeutic Targeting
CARD14 represents a potential therapeutic target:
NF-κB Modulation: Inhibiting CARD14-mediated NF-κB activation could reduce harmful neuroinflammation
MALT1 Inhibition: Small molecule MALT1 inhibitors indirectly target CARD14 signaling
Peripheral vs. CNS Effects: Therapeutic windows may exist for selective modulation
Research Directions
Key research areas include:
Developing selective CARD14 inhibitors
Understanding cell-type specific CARD14 functions in the brain
Biomarker development based on CARD14 activity
Clinical translation of NF-κB modulation strategies
[Jordaan S, et al., CARD14: a potential therapeutic target for inflammatory diseases. Pharmacology & Therapeutics. 2020 (2020)](https://pubmed.ncbi.nlm.nih.gov/32092341/)
[Chen J, et al., NF-κB in Alzheimer's disease: role and therapeutic targeting. Journal of Neuroinflammation. 2022 (2022)](https://pubmed.ncbi.nlm.nih.gov/35614461/)
[Unknown, Ghosh S, Karin M. Missing pieces in the NF-κB puzzle. Cell. 2002 (2002)](https://pubmed.ncbi.nlm.nih.gov/12077222/)
[Heneka MT, et al., Neuroinflammation in Alzheimer's disease. The Lancet Neurology. 2015 (2015)](https://pubmed.ncbi.nlm.nih.gov/25970342/)