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Macrophages are a primary source of cytokines, which they release to signal immune reinforcements, recruit other cells, and regulate inflammation as described in [1], [2], and [3]. Furthermore, macrophages are activated by cytokines produced by other cells, establishing a bidirectional regulatory relationship as noted in [4] and [5].
Facts (20)
Sources
3. The Innate Immune System - Immunopaedia immunopaedia.org.za 4 facts
claimMacrophages function in adaptive immune responses as antigen-presenting cells and as targets for cellular and humoral adaptive responses, where they are activated by T cell-derived cytokines and antibodies.
claimCytokines produced by macrophages have systemic effects: IL-1 induces fever, TNF-alpha causes wasting (cachexia), IL-6 induces liver production of acute phase proteins, and IL-3 increases neutrophil maturation and release from bone marrow.
claimMacrophages perform several defense functions: phagocytosis and killing of microorganisms/infected cells/tumor cells via PAMP recognition, scavenging debris/apoptotic bodies, antigen presentation to T cells, releasing cytokines/chemokines, and regulating immunity via the alternatively activated pathway.
claimMacrophages produce major cytokines including TNF-alpha, IL-1 beta, IL-6, IL-8, and IL-33.
Chronic Inflammation - StatPearls - NCBI Bookshelf ncbi.nlm.nih.gov 4 facts
claimTissue macrophages and dendritic cells contribute to antigen clearance through phagocytosis, the release of cytokines, and by serving as antigen-presenting cells to lymphocytes.
claimIn response to foreign or self-antigens, tissue immune cells like macrophages and dendritic cells release cytokines such as IL-1 and TNF-α.
claimIn response to foreign or self-antigens, tissue immune cells like macrophages and dendritic cells release cytokines such as IL-1 and TNF-α, which induce endothelial cells at the injury site to release Selectins and Integrins to stimulate leukocyte chemotaxis and diapedesis.
claimOnce circulating leukocytes enter a local injury site, they are activated by cytokines and chemokines secreted by macrophages and dendritic cells, subsequently releasing their own cytokines and mediators of inflammation.
Immunity In Depth | Linus Pauling Institute lpi.oregonstate.edu 3 facts
claimWhen a bacterium binds to surface receptors on a macrophage, it simultaneously triggers intracellular signaling that activates the transcription of pro-inflammatory cytokine genes in the nucleus, leading to the production and secretion of cytokines that act on nearby cells.
claimDHA supplementation alone had no effect on NK cell activity, T lymphocyte proliferation, neutrophil, monocyte, or macrophage numbers, respiratory burst, or cytokine production in healthy older adults.
measurementIn a randomized, double-blind, placebo-controlled trial involving 46 healthy older adults (ages 55 to 75 years), daily supplementation with 720 mg of EPA and 280 mg of DHA for 12 weeks had no effect on the numbers of neutrophils, monocytes, or macrophages, nor did it affect respiratory burst or the production of cytokines TNF-α, IL-1β, and IL-6.
Parts of the Immune System | Children's Hospital of Philadelphia chop.edu 3 facts
claimMacrophages play a critical role in activating other parts of the immune system by secreting chemical signals called cytokines after ingesting a pathogen.
claimMacrophages activate other parts of the immune system by secreting chemical signals called cytokines after ingesting a pathogen, which recruits other immune cells to the area and leads to inflammation.
claimThe secretion of cytokines by macrophages recruits other immune cells to the area, which leads to inflammation.
The Good, The Bad and the Ugly of Inflammation medschool.vanderbilt.edu 2 facts
claimWhite blood cells, such as granulocytes and macrophages, act as first responders to sites of infection and injury by emitting chemicals to kill germs and releasing protein messengers called cytokines.
claimFat cells produce cytokines, and as fat tissue grows, it attracts inflammatory cells like macrophages.
The Role of Immune Cells in Inflammation jmolpat.com 1 fact
claimMonocytes differentiate into macrophages, which are responsible for phagocytosing and clearing cellular debris and dead cells, producing cytokines and chemokines, and promoting tissue repair.
Pro-Inflammatory Cytokines Overview | Thermo Fisher Scientific - US thermofisher.com 1 fact
referenceIL-4 is classified as an adaptive immunity cytokine, is produced by Th cells, binds to the CD124 receptor, targets B cells, T cells, and macrophages, and functions in the proliferation of B and cytotoxic T cells, enhancement of MHC class II expression, and stimulation of IgG and IgE production.
What are Cytokines? Types & Function - Cleveland Clinic my.clevelandclinic.org 1 fact
claimImmune cells that release cytokines include macrophages, dendritic cells, lymphocytes (T and B lymphocytes), monocytes, neutrophils, basophils, eosinophils, and mast cells.
A Double-Edged Sword: Inflammation and Your Health - Cedars-Sinai cedars-sinai.org 1 fact
claimMacrophages, which are cells whose name means 'big eaters' in Greek, release compounds called cytokines to signal immune reinforcements to a site of injury or infection.