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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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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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Acute Inflammation I: Inflammatory Response01:26

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Acute inflammation is a rapid, short-lived physiological response to tissue injury or infection, designed to eliminate harmful agents and initiate repair. This tightly regulated process typically lasts from minutes to several days and is triggered by factors such as microbial invasion, physical trauma, or chemical injury.Recognition and Mediator ReleaseThe inflammatory response begins when resident immune cells—such as mast cells, macrophages, and dendritic cells—detect...
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Acute Inflammation I: Cellular Phase01:26

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The cellular phase of acute inflammation is a tightly orchestrated sequence of events that recruits leukocytes, primarily neutrophils, to sites of tissue injury or infection. Following the initial vascular changes, this phase ensures effective immune cell migration, activation, and function at the affected site to eliminate pathogens and initiate tissue repair.Leukocyte Recruitment CascadeLeukocyte recruitment happens in four steps: margination, adhesion, transmigration, and chemotaxis. Reduced...
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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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Area of Science:

  • Inflammation and Immunology
  • Biomedical Sciences
  • Molecular Medicine

Background:

  • Acute inflammation resolution is vital for host defense and tissue repair.
  • Omega-3 polyunsaturated fatty acids generate pro-resolving mediators like resolvin E1 (RvE1) and protectin D1 (PD1).
  • Understanding the specific roles of RvE1 and PD1 in inflammation resolution is crucial.

Purpose of the Study:

  • To investigate the precise functions of RvE1 and PD1 in regulating the resolution of acute inflammation.
  • To elucidate the mechanisms by which RvE1 and PD1 promote the clearance of inflammatory cells.
  • To identify novel pathways involved in the resolution of inflammation.

Main Methods:

  • Administered nanogram quantities of RvE1 and PD1 in vivo and in vitro.
  • Assessed leukocyte infiltration and macrophage phagocytosis of apoptotic neutrophils.
  • Utilized cyclooxygenase (COX) and lipoxygenase (LOX) inhibition models.
  • Investigated phagocyte trafficking to lymph nodes and spleen.
  • Examined resolution pathways involving adipose tissues.

Main Results:

  • RvE1 and PD1 significantly promoted phagocyte removal and clearance of apoptotic neutrophils.
  • Macrophage ingestion of apoptotic neutrophils was enhanced by RvE1 and PD1.
  • Inhibition of COX or LOX enzymes led to a 'resolution deficit', which was reversed by RvE1, PD1, or an aspirin-triggered lipoxin A4 analogue.
  • Identified new resolution routes involving phagocyte migration through adipose tissues.
  • Observed enhanced appearance of phagocytes with engulfed zymosan in lymph nodes and spleen.

Conclusions:

  • RvE1 and PD1 are potent agonists that actively promote the resolution of inflamed tissues.
  • These omega-3 derived mediators enhance crucial resolution processes, including efferocytosis and inflammatory cell clearance.
  • Novel resolution pathways and the role of phagocyte trafficking in resolution were identified.