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Related Concept Videos

Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

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,...
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
What is the Immune System?01:38

What is the Immune System?

Overview
Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase01:11

Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase

Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...

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Updated: Jul 8, 2026

Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
12:47

Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages

Published on: November 3, 2014

APOE genotype-specific differences in the innate immune response.

Michael P Vitek1, Candice M Brown, Carol A Colton

  • 1Duke University Medical Center, Durham, NC 27710, USA. mikevitek@cognosci.com

Neurobiology of Aging
|December 25, 2007
PubMed
Summary
This summary is machine-generated.

The APOE4 gene worsens neurological conditions by making brain immune cells, microglia, more inflammatory. This APOE4 effect is dose-dependent and seen in both brain and peripheral immune cells.

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Flow Cytometry Analysis of Immune Cells Within Murine Aortas
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Flow Cytometry Analysis of Immune Cells Within Murine Aortas

Published on: July 1, 2011

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Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
12:47

Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages

Published on: November 3, 2014

Flow Cytometry Analysis of Immune Cells Within Murine Aortas
15:15

Flow Cytometry Analysis of Immune Cells Within Murine Aortas

Published on: July 1, 2011

Area of Science:

  • Neuroimmunology
  • Genetics
  • Molecular Biology

Background:

  • Apolipoprotein E (ApoE) is crucial for brain lipid transport and immune modulation.
  • The APOE4 allele is linked to increased risk and severity in neurological disorders.
  • Microglia are the primary innate immune cells in the central nervous system.

Purpose of the Study:

  • To investigate the isoform-specific effects of Apolipoprotein E (ApoE) on microglial immune responses.
  • To determine how the APOE4 genotype influences neuroinflammation compared to the APOE3 genotype.
  • To explore the dose-dependent effects of ApoE isoforms on immune cell function.

Main Methods:

  • Utilized targeted replacement mice expressing human APOE3/3 and APOE4/4 genotypes.
  • Analyzed microglial phenotype, including morphology, nitric oxide (NO) production, and pro-inflammatory cytokine levels (TNF-alpha, IL-6, IL12p40).
  • Examined immune responses in vivo (LPS challenge in aged mice) and in peripheral macrophages, including APOE3/0 mice.

Main Results:

  • APOE4/4 microglia exhibit a pro-inflammatory phenotype with increased NO production and higher cytokine release compared to APOE3/3 microglia.
  • The pro-inflammatory effect of APOE4 is gene dose-dependent.
  • Similar APOE genotype-specific inflammatory profiles were observed in vivo and in peripheral macrophages, suggesting a systemic effect.

Conclusions:

  • The APOE genotype significantly impacts innate immune cell responses, particularly in microglia.
  • APOE4 promotes a pro-inflammatory state, contributing to worsened neurological disease pathology.
  • Both dose and qualitative differences of ApoE isoforms likely contribute to inflammation modulation.