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Related Experiment Videos

Cellular signaling pathways and cytoskeletal organization

K S Kosik1, W Q Qiu, S Greenberg

  • 1Harvard Medical School, Department of Neurology, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.

Annals of the New York Academy of Sciences
|January 17, 1996
PubMed
Summary

Amyloid precursor protein (APP) fragments may signal to cells, potentially explaining Alzheimer's disease (AD) intraneuronal pathology. The cysteine-rich N-terminus of APP is implicated in this signaling pathway.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Alzheimer's disease (AD) is characterized by intraneuronal pathology.
  • The amyloid precursor protein (APP) is a key protein implicated in AD pathogenesis.
  • Mechanisms linking extracellular APP products to intracellular neuronal changes are not fully understood.

Purpose of the Study:

  • To propose a mechanism for how extracellular amyloid precursor protein (APP) products influence intraneuronal pathology in Alzheimer's disease (AD).
  • To investigate the role of specific APP domains in cellular signaling.
  • To explore the potential connection between APP metabolism and tau phosphorylation in AD.

Main Methods:

  • Analysis of the functional domains of APP.
  • Investigation of extracellular proteolytic products of APP.

Related Experiment Videos

  • Consideration of signaling pathways transduced by APP fragments.
  • Examination of the relationship between APP and tau phosphorylation.

    • Main Results:

    • Extracellular proteolytic products of APP possess signaling capabilities.
    • This signaling activity is localized to the cysteine-rich amino terminus of APP.
    • A potential mechanism for APP's involvement in intraneuronal AD pathology is described.

    Conclusions:

    • Extracellular APP fragments, particularly from the N-terminus, may act as signaling molecules.
    • These signals could contribute to the intraneuronal pathology observed in Alzheimer's disease.
    • Further research is warranted to elucidate the precise mechanisms by which APP affects tau phosphorylation and neuronal dysfunction.