APP

Understanding Entity Pages

This page aggregates everything SciDEX knows about APP: its mechanistic relationships (Knowledge Graph edges), hypotheses targeting it, analyses mentioning it, and supporting scientific papers. The interactive graph below shows its immediate neighbors. All content is AI-synthesized from peer-reviewed literature.

Summary

Amyloid Precursor Protein (APP) is a type I transmembrane protein critical for neuronal development, synapse formation, and iron homeostasis. APP is cleaved by two competing pathways: the non-amyloidogenic pathway (alpha-secretase ADAM10) producing neuroprotective sAPPalpha, and the amyloidogenic pathway (BACE1 and gamma-secretase) producing amyloid-beta peptides (Abeta40 and Abeta42). Accumulation of Abeta42 triggers the amyloid cascade hypothesis of Alzheimer's disease. Over 50 familial AD mutations in APP increase Abeta42 production or aggregation propensity. APP is located on chromosome 21, explaining early-onset AD in Down syndrome. Current therapies target APP processing (BACE1 inhibitors, gamma-secretase modulators) or Abeta clearance (anti-amyloid antibodies like lecanemab and donanemab).

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graph TD
    subgraph Pathology["Pathology"]
        APP["APP"] -->|"associated with"| Cancer["Cancer"]
        APP["APP"] -->|"associated with"| Neurodegeneration["Neurodegeneration"]
        APP["APP"] -->|"associated with"| PSEN1["PSEN1"]
        APP["APP"] -->|"associated with"| Alzheimer_3["Alzheimer"]
        APP["APP"] -->|"associated with"| Als_4["Als"]
        APOE["APOE"] -->|"associated with"| APP["APP"]
        APOPTOSIS["APOPTOSIS"] -->|"associated with"| APP["APP"]
        ALZHEIMER_S_DISEASE_5["ALZHEIMER'S DISEASE"] -->|"associated with"| APP["APP"]
    end
    subgraph Signaling["Signaling"]
        APP["APP"] -->|"activates"| Alzheimer["Alzheimer"]
        APP["APP"] -->|"activates"| Als_2["Als"]
        APP_PS1["APP/PS1"] -.->|"inhibits"| APP["APP"]
        APP_PS1_6["APP/PS1"] -->|"activates"| APP["APP"]
    end
    subgraph Therapeutic["Therapeutic"]
        APP["APP"] -->|"therapeutic target"| Alzheimer_1["Alzheimer"]
        APP["APP"] -->|"therapeutic target"| Als["Als"]
        ALZHEIMER_S_DISEASE["ALZHEIMER'S DISEASE"] -->|"therapeutic target"| APP["APP"]
    end
    style APP fill:#4a1a6b,stroke:#4fc3f7,stroke-width:3px,color:#e0e0e0,font-weight:bold
    style Cancer fill:#ef5350,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style Neurodegeneration fill:#ef5350,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style Alzheimer fill:#ef5350,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style Alzheimer_1 fill:#ef5350,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style Als fill:#ef5350,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style Als_2 fill:#ef5350,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style PSEN1 fill:#4a1a6b,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style Alzheimer_3 fill:#ef5350,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style Als_4 fill:#ef5350,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style APOE fill:#4a1a6b,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style APP_PS1 fill:#4a1a6b,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style APOPTOSIS fill:#4a1a6b,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style ALZHEIMER_S_DISEASE fill:#4a1a6b,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style ALZHEIMER_S_DISEASE_5 fill:#4a1a6b,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0
    style APP_PS1_6 fill:#4a1a6b,stroke:#4fc3f7,stroke-width:1px,color:#e0e0e0