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Related Concept Videos

Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
Innate immunity is the body's natural, nonspecific defense system that acts quickly to protect against pathogens. It incorporates physical barriers like skin and mucous membranes and cellular elements such as phagocytes and natural killer cells. This part of our immune system provides an immediate,...
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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Immune Response Against Viral Pathogens01:29

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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Updated: Mar 23, 2026

Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
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APP as an innate injury-response molecule.

Zachary T Olmsted1, Michael V Sofroniew2

  • 1Department of Neurosurgery, David Geffen School of Medicine, University of California Los Angeles, CA, USA.

Neurobiology of Disease
|March 21, 2026
PubMed
Summary

Amyloid precursor protein (APP) has vital roles in neuronal development and tissue repair beyond its link to Alzheimer's disease. Understanding these diverse functions is key to comprehending neurodegenerative disorders.

Keywords:
Alzheimer's diseaseAmyloid precursor protein (APP)NeuroinflammationSpinal cord injuryStrokeTraumatic brain injuryVascular dementia

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pathology

Background:

  • Amyloid precursor protein (APP) is primarily known for its role in producing amyloid beta (Aβ), a key factor in Alzheimer's disease.
  • However, APP's evolutionary origins suggest functions beyond Aβ production.

Purpose of the Study:

  • To review the known functions of APP and its proteolytic derivatives.
  • To explore APP's roles in neuronal development, CNS function, and tissue injury response.

Main Methods:

  • Literature review of existing evidence on APP and its derivatives.
  • Analysis of APP's functions across various mammalian organ systems.

Main Results:

  • APP and its derivatives (sAPPα, CTFα, sAPPβ, CTFβ, p3, AICD, Aβ) are involved in neuronal development and CNS function.
  • APP also plays innate roles in responses to cell and tissue injury, including hemostasis, inflammation, glial cell function, antimicrobial defense, and wound healing.

Conclusions:

  • APP possesses dual roles in both normal neuronal function and injury response.
  • These dual roles may be linked to, and potentially predispose individuals to, APP-related neurodegenerative disorders in the CNS.