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Acute Inflammation III: Local and Systemic Effects

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...

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...

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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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Inflammatory Response

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Related Experiment Video

Updated: Jun 20, 2026

Design of Cecal Ligation and Puncture and Intranasal Infection Dual Model of Sepsis-Induced Immunosuppression

Design of Cecal Ligation and Puncture and Intranasal Infection Dual Model of Sepsis-Induced Immunosuppression

Published on: June 15, 2019

Sepsis, complement and the dysregulated inflammatory response.

Peter A Ward¹, Hongwei Gao

¹The University of Michigan Medical School, Department of Pathology, Ann Arbor, MI 48109-5602, USA. pward@umich.edu

Journal of Cellular and Molecular Medicine

|September 4, 2009

Summary

This summary is machine-generated.

Sepsis triggers complement activation, leading to severe inflammation and organ damage. Blocking C5a signaling pathways significantly improves survival rates in experimental sepsis models.

More Related Videos

Evaluation of a Reliable Biomarker in a Cecal Ligation and Puncture-Induced Mouse Model of Sepsis

Evaluation of a Reliable Biomarker in a Cecal Ligation and Puncture-Induced Mouse Model of Sepsis

Published on: December 9, 2022

Related Experiment Videos

Last Updated: Jun 20, 2026

Design of Cecal Ligation and Puncture and Intranasal Infection Dual Model of Sepsis-Induced Immunosuppression

Design of Cecal Ligation and Puncture and Intranasal Infection Dual Model of Sepsis-Induced Immunosuppression

Published on: June 15, 2019

Evaluation of a Reliable Biomarker in a Cecal Ligation and Puncture-Induced Mouse Model of Sepsis

Evaluation of a Reliable Biomarker in a Cecal Ligation and Puncture-Induced Mouse Model of Sepsis

Published on: December 9, 2022

Area of Science:

Immunology
Pathophysiology
Pharmacology

Background:

Sepsis is a life-threatening condition with high mortality, primarily managed with supportive care.
Experimental models, like cecal ligation and puncture (CLP), are crucial for understanding sepsis.
Complement system activation, particularly C5a signaling, is implicated in sepsis pathogenesis.

Purpose of the Study:

To investigate the role of C5a signaling in sepsis-induced organ damage and mortality.
To evaluate the therapeutic potential of targeting C5a receptors in experimental sepsis.

Main Methods:

Utilized the cecal ligation and puncture (CLP) model in rodents to induce sepsis.
Assessed complement activation and C5a receptor (C5aR, C5L2) expression in various organs.
Administered interventions targeting C5a or its receptors to evaluate survival and pathological outcomes.

Main Results:

CLP robustly activated the complement system and upregulated C5a receptors in multiple organs.
Interception of C5a or its receptors significantly improved survival in septic rodents.
C5a signaling was linked to apoptosis, immune dysfunction, coagulopathy, and cardiac dysfunction.

Conclusions:

Complement activation via C5a plays a critical role in sepsis pathophysiology.
Targeting C5a signaling represents a promising therapeutic strategy for sepsis treatment.
Findings have significant implications for developing novel sepsis therapies in humans.