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Related Experiment Videos

The search for an endogenous activator.

K M Gekowski, E Atkins

    The Yale Journal of Biology and Medicine
    |March 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Researchers investigated endogenous mediators of inflammation to understand fever without infection. They found no endogenous activator in human monocytes that could explain fever solely from inflammation or tissue damage.

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    Area of Science:

    • Immunology
    • Inflammation Research
    • Fever Pathogenesis

    Background:

    • Fever can occur without infection or hypersensitivity, often linked to inflammation or tissue necrosis (e.g., myocardial infarction, pulmonary embolism).
    • Microbial pyrogens trigger monocytes/macrophages to produce endogenous pyrogen (EP), a key mediator of fever.

    Purpose of the Study:

    • To determine if plasma and cellular endogenous mediators (EMs) of inflammation stimulate EP production in human monocytes.
    • To identify potential endogenous activators of EP release in non-infectious febrile conditions.

    Main Methods:

    • Human mononuclear cells (M/L) were incubated with various endogenous mediators and tested for EP production in rabbit assays.
    • Neutrophils (PMNs), complement factors (C3b, C5a), a synthetic peptide (FMLP), and nucleic acids (Poly I:Poly C, E. coli RNA, calf thymus DNA) were evaluated for EP induction capacity.

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    Main Results:

    • Neither neutrophils, complement factors, nor FMLP stimulated EP release from human monocytes.
    • Tested nucleic acids did not induce EP production in vitro; only Poly I:Poly C caused fever in rabbits.
    • No endogenous activator was identified in human monocytes to explain fevers associated solely with inflammation.

    Conclusions:

    • The study failed to identify an endogenous activator from human monocytes that explains fever in the absence of infection.
    • Further research is needed to elucidate the mechanisms behind inflammation-induced fever without identifiable infectious triggers.