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Related Concept Videos

Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).

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Specific modulation of complement-dependent human granulocyte function by imidazole acetic acid.

J J Herman, H R Colten

    The Journal of Allergy and Clinical Immunology
    |October 1, 1980
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    Imidazole acetic acid (IAA), a histamine breakdown product, specifically inhibits complement-mediated histaminase release from human neutrophils (PMNs). It also modestly impairs neutrophil chemotaxis, suggesting a targeted role in immune responses.

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    Area of Science:

    • Immunology
    • Biochemistry

    Background:

    • Imidazole acetic acid (IAA) is a metabolite of histamine.
    • Previous studies indicated IAA inhibits histaminase release from human polymorphonuclear leukocytes (PMNs).

    Purpose of the Study:

    • To investigate the effect of IAA on various neutrophil functions beyond histaminase release.
    • To determine the specificity of IAA's modulatory effects on PMN activity.

    Main Methods:

    • Human polymorphonuclear leukocytes (PMNs) were isolated.
    • Neutrophil functions including histaminase release, degranulation (beta-glucuronidase, myeloperoxidase, lysozyme), phagocytosis, superoxide generation, and chemotaxis were assessed.
    • Stimuli included particle-bound C3b, aggregated IgG, phorbol myristate acetate (PMA), calcium ionophore, and FMLP.

    Main Results:

    • IAA (≥10⁻¹⁰ M) specifically inhibited histaminase release induced by particle-bound C3b.
    • IAA did not affect histaminase release induced by aggregated IgG, PMA, FMLP, or calcium ionophore.
    • IAA did not impact the release of beta-glucuronidase, myeloperoxidase, or lysozyme.
    • Phagocytosis and superoxide generation by neutrophils were unaffected by IAA.
    • IAA demonstrated a modest inhibition of neutrophil chemotaxis.

    Conclusions:

    • Imidazole acetic acid (IAA) exhibits a highly specific inhibitory effect on complement-mediated histaminase release from human neutrophils.
    • IAA's impact is primarily on complement-dependent pathways, with limited effects on other neutrophil functions.
    • The findings suggest IAA plays a specific role in modulating neutrophil responses, particularly those triggered by complement activation.