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Related Concept Videos

Chronic Inflammation: Introduction01:12

Chronic Inflammation: Introduction

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Chronic inflammation is a prolonged, dysregulated immune response that persists for weeks to years when the inciting stimulus is difficult to eradicate or when self‑antigens drive ongoing reactivity. Morphologically, it is defined by mononuclear cell infiltration, progressive tissue destruction, and concurrent attempts at healing via angiogenesis and fibrosis. Compared with acute inflammation, edema is less prominent while cellular infiltration predominates; triggers include persistent...
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Acute Inflammation II: Local and Systemic Effects01:25

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Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
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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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Acute Pancreatitis II: Pathophysiology01:21

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The pathophysiology of acute pancreatitis centers on injury to pancreatic acinar cells, which initiates a cascade of harmful intracellular events.This injury leads to premature activation of trypsinogen to trypsin in the pancreas. Trypsin then activates other digestive enzymes, such as chymotrypsin, elastase, and phospholipase A2, which begin breaking down pancreatic tissue. The resulting autodigestion causes local inflammation, tissue swelling, hemorrhage, and fat necrosis.Injured acinar cells...
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[Inflammation and structural organ damage: chicken or egg?].

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Morbidity in immune-mediated inflammatory diseases (IMIDs) stems from tissue damage, not just inflammation. A new hypothesis suggests stromal remodeling drives inflammation, shifting therapeutic focus for diseases like ankylosing spondylitis.

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Area of Science:

  • Rheumatology
  • Immunology
  • Pathology

Background:

  • Morbidity in immune-mediated inflammatory diseases (IMIDs) is primarily linked to functional/anatomical loss of organ integrity.
  • Tissue damage, often irreversible, is typically viewed as a consequence of inflammation and failed repair.
  • Recent observations in rheumatic diseases challenge the direct causal link between inflammation and structural damage in all IMIDs.

Purpose of the Study:

  • To propose an alternative hypothesis for the relationship between inflammation and tissue damage in IMIDs.
  • To investigate the potential role of stromal remodeling as a driver of inflammation.
  • To suggest a paradigm shift in therapeutic strategies for IMIDs.

Main Methods:

  • Review of clinical observations in rheumatic diseases.
  • Analysis of treatment outcomes with potent anti-inflammatory drugs.
  • Formulation of a novel etiological hypothesis.

Main Results:

  • Evidence suggests that in some IMIDs, inflammation and structural damage may be uncoupled.
  • Potent anti-inflammatory treatments show efficacy in diseases like ankylosing spondylitis, indicating a complex relationship.
  • A new hypothesis posits that stromal remodeling, not inflammation, may be the primary driver.

Conclusions:

  • The traditional view of inflammation causing tissue damage in IMIDs may not universally apply.
  • Stromal remodeling could be the causal factor driving inflammation in certain IMIDs.
  • Therapeutic strategies for IMIDs like ankylosing spondylitis, scleroderma, and asthma may need to target tissue remodeling pathways.