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Inflammatory Response01:28

Inflammatory Response

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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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The immune system's inflammatory response destroys the invading pathogen, permitting the tissue to heal. The changes during the cellular and vascular stages allow exudate formation at the site of inflammation. The inflammatory exudate released from the wound has high protein content and a specific gravity above 1.020.
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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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Surgical interventions for inflammatory bowel disease (IBD), which includes ulcerative colitis and Crohn's disease, are essential in managing symptoms and addressing complications. The selection of surgical procedures is contingent upon the specific conditions and complications that stem from these illnesses.
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Three-dimensional Inflammatory Human Tissue Equivalents of Gingiva
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Neurons Are the Inflammatory Problem.

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  • 1Feinstein Institute for Medical Research, Manhasset, New York, USA.

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Sensory neurons reflexively inhibit immune responses, leading to severe tissue damage in flesh-eating disease. This discovery reveals a new mechanism linking the nervous and immune systems during infection.

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Area of Science:

  • Neuroimmunology
  • Infectious Disease Mechanisms

Background:

  • Reflex neuronal circuits are increasingly recognized as regulators of physiological processes, including immunity.
  • Understanding the interplay between the nervous and immune systems is crucial for deciphering complex diseases.

Purpose of the Study:

  • To investigate the role of reflex neuronal circuits in the pathogenesis of severe infections.
  • To elucidate the mechanistic link between sensory neurons and immune suppression during streptococcal necrotizing fasciitis.

Main Methods:

  • Utilized a mouse model of streptococcal necrotizing fasciitis.
  • Investigated the contribution of sensory neurons to disease severity and immune cell infiltration.
  • Examined the impact of neuronal signaling on frontline immune responses.

Main Results:

  • Sensory neurons were found to actively suppress immune cell recruitment and function at the site of infection.
  • This neuro-immune inhibition by sensory neurons exacerbates tissue destruction caused by *Streptococcus pyogenes*.
  • Targeting this neuronal reflex could represent a novel therapeutic strategy.

Conclusions:

  • Reflex neuronal circuits play a critical role in modulating immune responses during severe bacterial infections.
  • Sensory neurons actively inhibit protective immunity, contributing to the lethality of necrotizing fasciitis.
  • This study highlights a novel neuro-immune axis in infection and injury.