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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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What is the Immune System?01:38

What is the Immune System?

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Overview
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Transduction01:16

Transduction

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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

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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...
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Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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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.
Complete Antigens
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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Related Experiment Video

Updated: Aug 14, 2025

Detection of Fluorescent Nanoparticle Interactions with Primary Immune Cell Subpopulations by Flow Cytometry
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Detection of Fluorescent Nanoparticle Interactions with Primary Immune Cell Subpopulations by Flow Cytometry

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Interaction between nanomaterials and the innate immune system across evolution.

Diana Boraschi1,2,3,4, Laura Canesi5, Damjana Drobne6

  • 1Shenzhen Institute of Advanced Technology (SIAT), Chinese Academy of Science (CAS), 1068 Xueyuan Blvd, 518071, Shenzhen, China.

Biological Reviews of the Cambridge Philosophical Society
|January 14, 2023
PubMed
Summary

Engineered nanomaterials interact with innate immunity, primarily phagocytes and Toll-like receptors. This review examines these interactions across diverse species to understand healthy versus harmful responses.

Keywords:
Toll-like receptorshumanin vitroin vivoinnate immunityinvertebratesphagocytesplants

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Whole-animal Imaging and Flow Cytometric Techniques for Analysis of Antigen-specific CD8+ T Cell Responses after Nanoparticle Vaccination
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Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
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Screening Bioactive Nanoparticles in Phagocytic Immune Cells for Inhibitors of Toll-like Receptor Signaling
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Area of Science:

  • Immunology
  • Toxicology
  • Nanotechnology

Background:

  • Engineered nanomaterials (ENMs) interact with host defenses at interface tissues.
  • Immuno-nanotoxicology investigates the safety and potential damage from ENM-immune system interactions.
  • Innate immunity, the first line of defense, is crucial for recognizing foreign agents.

Approach:

  • This review focuses on phagocytes and Toll-like receptors (TLRs), key components of innate immunity.
  • It compares phagocyte- and TLR-dependent responses to ENMs across various species, including mammals, invertebrates, and plants.
  • The study assesses mechanisms of both beneficial and detrimental interactions between ENMs and host defenses.

Key Points:

  • Phagocytes and TLRs are central to the innate immune response to ENMs.
  • Common recognition and elimination pathways for ENMs exist across diverse evolutionary lineages.
  • Understanding these conserved mechanisms is vital for predicting ENM safety.

Conclusions:

  • Innate immunity plays a sufficient role in maintaining tissue integrity and homeostasis against ENMs.
  • Successful ENM-host defense interactions are characterized by efficient recognition and elimination.
  • Pathological interactions may arise from dysregulation of these innate immune pathways.