Inflammatory response of macrophages in infection

Ling Zhang1, Cheng-Cai Wang

  • 1Department of Anesthesiology, Changzhen Hospital, Second Military Medical University, Shanghai 200003, China. wangchengcai81@sina.com.

Abstract

Insights

Macrophages are key innate immune cells that clear pathogens. Their inflammatory response to infection involves recognition, recruitment, microbicidal activity, and repair, all under complex molecular regulation.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Macrophages are crucial innate immune cells involved in numerous physiological and pathological processes.
  • Their primary role is the phagocytosis and elimination of invading pathogens.

Purpose of the Study:

  • To systematically review the inflammatory response of macrophages during infection.
  • To explore the molecular mechanisms regulating macrophage activation.

Main Methods:

  • A systematic literature search of PubMed was conducted.
  • 122 articles on macrophage inflammatory responses in infection were reviewed.

Main Results:

  • Macrophage inflammatory responses to infection involve pathogen recognition, cell recruitment/proliferation, microbicidal activity, and transition to an anti-inflammatory phenotype for tissue repair.
  • Recent discoveries highlight complex molecular regulation, including signaling molecules, membrane proteins, microRNAs, and epigenetic factors.

Conclusions:

  • The inflammatory response of macrophages during infection is a complex, ordered process.
  • This response is intricately regulated at the molecular level.

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,...
12.5K
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,...
15.8K
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...
94
Inflammation01:38

Inflammation

Overview
46.6K
Immune Surveillance by NK Cells and Phagocytes01:25

Immune Surveillance by NK Cells and Phagocytes

Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
7.2K
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...
41