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Nociception

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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
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Inflammatory Response I: Vascular and Cellular01:30

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The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
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Related Experiment Video

Updated: Jul 21, 2025

Increased Recovery Time and Decreased LPS Administration to Study the Vagus Nerve Stimulation Mechanisms in Limited Inflammatory Responses
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Mechanosensory feedback loops during chronic inflammation.

Sarbari Saha1,2,3, Dafne Müller1, Andrew G Clark1,2,3

  • 1University of Stuttgart, Institute of Cell Biology and Immunology, Stuttgart, Germany.

Frontiers in Cell and Developmental Biology
|July 26, 2023
PubMed
Summary

Epithelial barrier disruption alters tissue mechanics, promoting inflammation. Targeting these mechanical changes offers a new strategy for treating chronic inflammatory diseases like inflammatory bowel disease (IBD).

Keywords:
chronic inflammatory diseasesepithelial barrierextracellular matriximmune cellsimmuno-biophysicsimmuno-mechanobiologyinflammationtissue mechanics

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Area of Science:

  • Cell Biology
  • Immunology
  • Biophysics

Background:

  • Epithelial tissues form critical barriers in organs like skin, lungs, and intestines, protecting against infection.
  • Barrier disruption triggers inflammation, but associated changes in tissue mechanics are often overlooked.

Purpose of the Study:

  • To review molecular mechanisms linking epithelial barrier dysfunction to tissue mechanical changes.
  • To explore how these mechanical alterations influence immune responses and disease progression.

Main Methods:

  • Literature review focusing on molecular mechanisms.
  • Analysis of direct (ECM enzyme secretion) and indirect (fibroblast activation) pathways.
  • Discussion of feedback loops between barrier function and mechanics.

Main Results:

  • Epithelial barrier loss directly and indirectly alters tissue mechanics.
  • Altered mechanics modulate immune cell activity and exacerbate inflammation.
  • A positive feedback loop exists between barrier dysfunction and mechanical changes.

Conclusions:

  • Tissue mechanical changes are integral to epithelial barrier disruption and chronic inflammation.
  • Modulating tissue mechanics presents a novel therapeutic framework for inflammatory diseases.
  • This framework is relevant to inflammatory bowel disease (IBD), liver disease, and cancer.