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Related Experiment Videos

Adrenergic receptors on monocytes modulate complement component synthesis.

D Lappin, K Whaley

    Clinical and Experimental Immunology
    |March 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    Adrenergic agonists like adrenaline enhance complement component synthesis in monocytes via alpha-1 adrenergic receptors. This finding reveals a novel link between adrenergic signaling and immune complement production.

    Area of Science:

    • Immunology
    • Pharmacology

    Background:

    • Monocytes play a crucial role in the innate immune system.
    • Complement system components are vital for immune responses.
    • Adrenergic signaling can modulate immune cell functions.

    Purpose of the Study:

    • To investigate the effect of adrenergic agonists on complement component synthesis in human monocytes.
    • To identify the specific adrenergic receptor subtype involved in this process.

    Main Methods:

    • Monocyte cultures were treated with various adrenergic agonists (adrenaline, noradrenaline, phenylephrine, isoprenaline).
    • Receptor antagonists (phentolamine, propranolol, prazosin) were used to determine receptor specificity.
    • Pulse labeling with 3H-amino acids was employed to quantify protein synthesis.

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    Main Results:

    • Adrenaline, noradrenaline, and phenylephrine significantly enhanced the synthesis of complement component C2.
    • Isoprenaline did not affect C2 synthesis.
    • The effect was blocked by phentolamine (alpha-adrenergic antagonist) and prazosin (alpha-1 adrenergic antagonist), but not propranolol (beta-adrenergic antagonist).
    • Enhanced synthesis was observed for eight complement components (C2, C3, C4, C5, factor B, properdin, beta 1H, C3b inactivator) and total protein.

    Conclusions:

    • Alpha-1 adrenergic receptors mediate the enhancement of complement component synthesis in monocytes.
    • Adrenergic stimulation can broadly increase the production of multiple complement factors and total protein in monocytes.
    • These findings suggest a significant interplay between the adrenergic system and complement production in monocytes.