ZAP70 — Zeta Chain T-Cell Receptor Associated Protein Kinase 70
Introduction
flowchart TD
ZAP70["ZAP70"] -->|"regulates"| Ms["Ms"]
ZAP70["ZAP70"] -->|"regulates"| Autism["Autism"]
ZAP70["ZAP70"] -->|"biomarker for"| Cardiovascular["Cardiovascular"]
ZAP70["ZAP70"] -->|"biomarker for"| Atherosclerosis["Atherosclerosis"]
ZAP70["ZAP70"] -->|"biomarker for"| Diabetes["Diabetes"]
ZAP70["ZAP70"] -->|"biomarker for"| Als["Als"]
ZAP70["ZAP70"] -->|"biomarker for"| Ms["Ms"]
ZAP70["ZAP70"] -->|"interacts with"| TP53["TP53"]
ZAP70["ZAP70"] -->|"interacts with"| CD19["CD19"]
ZAP70["ZAP70"] -->|"interacts with"| EEF2["EEF2"]
ZAP70["ZAP70"] -->|"interacts with"| CCL5["CCL5"]
ZAP70["ZAP70"] -->|"interacts with"| TNF["TNF"]
ZAP70["ZAP70"] -->|"interacts with"| TLR7["TLR7"]
ZAP70["ZAP70"] -->|"interacts with"| CAT["CAT"]
style ZAP70 fill:#4fc3f7,stroke:#333,color:#000
ZAP70 (Zeta Chain T-Cell Receptor Associated Protein Kinase 70) is a tyrosine kinase essential for T-cell receptor (TCR) signaling and adaptive immunity. While primarily studied in immune cells, ZAP70 has emerging roles in neuroinflammation—a key contributor to neurodegenerative disease pathogenesis.
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ZAP70 — Zeta Chain T-Cell Receptor Associated Protein Kinase 70
Introduction
Mermaid diagram (expand to render)
ZAP70 (Zeta Chain T-Cell Receptor Associated Protein Kinase 70) is a tyrosine kinase essential for T-cell receptor (TCR) signaling and adaptive immunity. While primarily studied in immune cells, ZAP70 has emerging roles in neuroinflammation—a key contributor to neurodegenerative disease pathogenesis.
<div class="infobox infobox-gene">
Protein Structure and Function
Domain Architecture ZAP70 is a member of the Syk family of tyrosine kinases:
N-terminal tandem SH2 domains : Bind to phosphorylated ITAM motifs on TCR ζ-chainInterdomain A : Regulatory regionKinase domain : Catalytic activity (C-terminal)C-terminal proline-rich region : Protein-protein interactionsActivation Mechanism
TCR engagement leads to Src-family kinase activationITAM phosphorylation creates docking sites for ZAP70SH2 domain binding recruits ZAP70 to the receptor complexAutophosphorylation activates kinase activityDownstream signaling through LAT, SLP-76 complex
Key Substrates
LAT : Linker for activation of T cellsSLP-76 : Adapter proteinVav : GEF for Rho family GTPasesPLC-γ1 : Phospholipase C activationRole in Neurodegenerative Diseases
Alzheimer's Disease
Peripheral T-cell activation : ZAP70-mediated T-cell responses may contribute to neuroinflammation in AD [@stanga2018]Adaptive immunity : T-cell infiltration into brain parenchyma observed in AD patients cytokine production : ZAP70+ T cells can produce pro-inflammatory cytokinesTherapeutic implications : Immunomodulatory strategies targeting T-cell activationParkinson's Disease
Neuroinflammation : Chronic neuroinflammation drives PD progression [@tansey2010]T-cell involvement : [α-Synuclein](/proteins/alpha-synuclein)-specific T cells may exhibit ZAP70-dependent activation[Blood-brain barrier](/entities/blood-brain-barrier) : T-cell trafficking may be influenced by ZAP70 signalingMicroglial crosstalk : T-cell-derived cytokines activate [microglia](/cell-types/microglia-neuroinflammation)Amyotrophic Lateral Sclerosis (ALS)
T-cell dysregulation : Altered T-cell responses in ALS patients [@chio2015]ZAP70+ T cells : Infiltrating T cells may contribute to motor neuron injuryRegulatory T cells : Tregs with altered ZAP70 signaling in ALSMultiple Sclerosis
Direct relevance : ZAP70 is central to MS pathogenesisTherapeutic targeting : ZAP70 inhibitors investigated for MS treatmentThe Cholinergic Anti-Inflammatory Pathway
Neuroimmune Interaction The brain can modulate peripheral immune responses through the vagus nerve:
[Acetylcholine](/entities/acetylcholine) release from T cellsα9α10 nAChR signaling on macrophagesZAP70-independent pathway : This contrasts with ZAP70-mediated T-cell activationImplications for Neurodegeneration Understanding the balance between:
Pro-inflammatory : ZAP70-mediated T-cell activationAnti-inflammatory : Cholinergic signaling...may lead to novel immunomodulatory therapies.
Therapeutic Targeting
ZAP70 Inhibitors
ATP-competitive inhibitors : Purvalanol A, PP1Allosteric inhibitors : Under developmentSH2 domain blockers : Prevent ITAM binding
Clinical Relevance
Autoimmune diseases : ZAP70 inhibitors for rheumatoid arthritis, lupusTransplantation : Immunosuppressive therapyNeurodegeneration : Indirect targeting through immunomodulationSee Also
[T-Cell Receptor Signaling](/mechanisms/t-cell-receptor-signaling)
[Neuroinflammation](/mechanisms/neuroinflammation)
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)
[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
[Microglia](/cell-types/microglia)
[Cholinergic Anti-Inflammatory Pathway](/mechanisms/cholinergic-anti-inflammatory-pathway)
References
[Smith-Garvin et al., T cell receptor signaling (2009) (2009)](https://pubmed.ncbi.nlm.nih.gov/19197294/)
[Unknown, Appel, T cells and neurodegeneration (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20637096/)
[Stanga et al., Adaptive immunity in AD (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/29626437/)
[Unknown, Tansey & Goldberg, Neuroinflammation in PD (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20027309/)
[Chio et al., T cells in ALS (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25682741/)
Pathway Diagram The following diagram shows the key molecular relationships involving ZAP70 — Zeta Chain T-Cell Receptor Associated Protein Kinase 70 discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)
Expression Profile Sources: [GTEx Portal v10](https://gtexportal.org/home/gene/zap70) | [Allen Brain Atlas](https://www.brain-map.org/)
| Rank | Tissue | Median TPM |
Highest expression outside brain: Spleen (68.64 TPM)
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