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Related Concept Videos

Autoimmune Disorders01:29

Autoimmune Disorders

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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune...
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Frequency-dependent Selection01:21

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
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Drug Dependence01:17

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Medications are typically administered to achieve therapeutic effects. Some drugs can modify an individual's mood and perception, frequently resulting in various enjoyable experiences. However, this can result in drug dependency, a condition marked by continuous drug use despite potential negative consequences. Drug dependency primarily falls into two categories: psychological and physical dependence. Psychological dependence occurs when the pleasurable feelings induced by the drug...
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B Cell Activation and Differentiation01:24

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Development of Stem Cell-derived Antigen-specific Regulatory T Cells Against Autoimmunity
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TLR-dependent T cell activation in autoimmunity.

Kingston H G Mills1

  • 1Immunology Research Centre and School of Biochemistry and Immunology, Trinity College Dublin, Ireland. millsk@tcd.ie

Nature Reviews. Immunology
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Summary
This summary is machine-generated.

Infection and danger signals activate immune cells, driving T cell activation and potentially causing autoimmune diseases by breaking down self-tolerance. This highlights the role of innate immunity in autoimmunity development.

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Area of Science:

  • Immunology
  • Autoimmunity
  • Infectious Disease

Background:

  • Autoimmune diseases arise from a loss of immunological tolerance, allowing self-reactive T cells to become active.
  • A connection exists between infections and the development of human autoimmune conditions.
  • Experimental autoimmune diseases can be induced using autoantigens combined with Mycobacterium tuberculosis or pathogen-associated molecular patterns (PAMPs).

Purpose of the Study:

  • To explore the role of pathogen-associated molecular patterns (PAMPs) and danger signals in T cell activation and autoimmunity.
  • To elucidate the mechanisms linking infection to the breakdown of immunological tolerance.
  • To understand how innate immune signaling contributes to the development of autoimmune diseases.

Main Methods:

  • Review of existing literature on autoimmunity, infection, and immune cell signaling.
  • Analysis of the role of pattern recognition receptors (PRRs) and Toll-like receptors (TLRs) in immune responses.
  • Examination of pro-inflammatory cytokine production and T cell activation pathways.

Main Results:

  • Pathogen-associated molecular patterns (PAMPs) and endogenous danger signals bind to pattern recognition receptors (PRRs), including Toll-like receptors (TLRs).
  • This binding activates signaling pathways in innate immune cells and T cells, leading to pro-inflammatory cytokine production.
  • Activated T cells and cytokine production are key factors in the development of autoimmune diseases.

Conclusions:

  • Infection and danger signals can trigger autoimmune responses by activating innate and adaptive immune cells.
  • The activation of T cells through pattern recognition receptor signaling is a critical mechanism in autoimmunity.
  • Understanding these pathways offers potential targets for preventing or treating autoimmune diseases.