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Related Concept Videos

Inflammatory Response01:28

Inflammatory Response

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.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
Inflammatory Response I: Vascular and Cellular01:30

Inflammatory Response I: Vascular and Cellular

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,...
Acute Inflammation III: Local and Systemic Effects01:25

Acute Inflammation III: Local and Systemic Effects

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...
Chronic Inflammation: Introduction01:12

Chronic Inflammation: Introduction

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...
Acute Inflammation I: Inflammatory Response01:26

Acute Inflammation I: Inflammatory Response

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 damage-associated...
Inflammation01:38

Inflammation

Overview

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Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
07:48

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

Published on: May 16, 2016

THE EFFECT OF INFLAMMATORY REACTIONS ON TISSUE IMMUNITY.

F M Hanger1,

  • 1Department of Medicine of the College of Physicians and Surgeons of Columbia University, and the Presbyterian Hospital, New York.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Bacterial allergy enhances survival by localizing infections. Pre-infection filtrate injections offer non-specific protection, while severe tissue injury reduces local resistance, impacting immune responses.

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Area of Science:

  • Immunology
  • Microbiology
  • Bacterial Infections

Background:

  • Bacterial allergy influences host resistance to infection.
  • Local tissue environment significantly impacts immune responses.
  • Understanding cellular resistance mechanisms is crucial for combating infections.

Purpose of the Study:

  • To investigate the role of bacterial allergy in host resistance to infection.
  • To determine the effects of bacterial filtrates and tissue injury on local immunity.
  • To elucidate the mechanisms underlying cellular resistance and non-specific protection.

Main Methods:

  • Assessing survival rates and infection localization in animals with varying degrees of bacterial allergy.
  • Administering bacterial filtrates to induce non-specific protection in skin areas.
  • Inducing tissue injury through chemical agents and antigen-antibody reactions to evaluate local resistance.
  • Analyzing the effects of immune serum and complement on infection outcomes.

Main Results:

  • Animals with natural bacterial allergy to B. lepisepticum filtrates showed increased survival and better infection localization.
  • Pre-infection injection of bacterial filtrates conferred non-specific protection to the skin, preventing necrosis.
  • Severe tissue injury compromised local resistance, even in immune animals, potentially due to antibody segregation.
  • Local alterations in sensitized animals receiving immune serum and antigen destroyed essential immune factors, but complement restored protection.
  • Allergy was not the primary mechanism but accelerated immune processes and rendered cells refractory to injury.
  • Chronic infection induced broad cellular reactivity, suggesting a non-specific mechanism for infection localization.

Conclusions:

  • Bacterial allergy contributes to host defense by enhancing infection localization and conferring resistance.
  • Non-specific protection can be achieved through pre-infection administration of bacterial products.
  • Tissue integrity is vital for local immune competence, with severe injury impairing antibody effectiveness.
  • Allergy plays a supporting role in cellular resistance by modulating immune responses and cell susceptibility.
  • Chronic infections can prime the host with a generalized, non-specific defense against diverse bacterial strains.