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Related Concept Videos

Antimicrobial Proteins01:23

Antimicrobial Proteins

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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Surface Membrane Barriers01:18

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The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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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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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Psoriasis and Antimicrobial Peptides.

Toshiya Takahashi1, Kenshi Yamasaki1

  • 1Department of Dermatology, Tohoku University Graduate School of Medicine, Sendai, Miyagi 980-8574, Japan.

International Journal of Molecular Sciences
|September 19, 2020
PubMed
Summary
This summary is machine-generated.

Antimicrobial peptides (AMPs) drive psoriasis inflammation by linking innate and adaptive immunity. These molecules amplify immune cell responses and cytokine production, contributing to disease pathogenesis and phenomena like the Köbner response.

Keywords:
DAMPsNETsS100 proteinsTh17antimicrobial peptidescathelicidin (LL-37)plasmacytoid dendritic cellspsoriasisβ-defensin

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Area of Science:

  • Immunology
  • Dermatology
  • Molecular Biology

Background:

  • Psoriasis is a systemic inflammatory condition involving immune cell interactions.
  • Antimicrobial peptides (AMPs) are key mediators in psoriasis pathogenesis.
  • AMPs activate innate immunity and promote inflammation through various mechanisms.

Purpose of the Study:

  • To elucidate the role of AMPs in psoriasis pathogenesis.
  • To understand how AMPs contribute to inflammation and immune cell activation in psoriasis.
  • To explore the involvement of AMPs in specific psoriasis phenomena like the Köbner phenomenon.

Main Methods:

  • Analysis of immune cell crosstalk in psoriasis.
  • Investigation of AMP secretion and function.
  • Examination of cytokine and interferon production.
  • Study of neutrophil extracellular traps (NETs) and their components.
  • Assessment of AMPs' effect on T cell responses and signaling pathways.

Main Results:

  • AMPs enhance the binding of damage-associated molecular patterns (DAMPs) like self-DNA and self-RNA to receptors.
  • AMPs promote interferon secretion from plasmacytoid dendritic cells and keratinocytes.
  • Neutrophil extracellular traps (NETs), containing AMP LL-37, induce Th17 responses.
  • Activated myeloid dendritic cells secrete IL-12 and IL-23, crucial for Th17 cell proliferation.
  • AMPs modulate Th17 and Th1 cytokine production and cellular signaling.

Conclusions:

  • AMPs are central players in psoriasis inflammation, bridging innate and adaptive immunity.
  • AMPs amplify inflammatory responses by enhancing DAMP recognition and cytokine production.
  • AMPs' role in DAMP signaling may explain the Köbner phenomenon in psoriasis.