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5-Hydroxytryptamine and rat passive peritoneal anaphylaxis.

J W Ross, H Smith, B A Spicer

    International Archives of Allergy and Applied Immunology
    |January 1, 1978
    PubMed
    Summary
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    This study found that 5-hydroxytryptamine (5-HT) does not directly cause fluid leakage in rat passive peritoneal anaphylaxis. However, 5-HT can enhance fluid leakage when combined with histamine.

    Area of Science:

    • Immunology
    • Pharmacology

    Background:

    • Passive peritoneal anaphylaxis is an immune response involving mast cell degranulation.
    • 5-hydroxytryptamine (5-HT) is a mediator released during anaphylaxis, but its direct role in vascular permeability is debated.
    • Histamine is a known mediator of increased vascular permeability during anaphylaxis.

    Purpose of the Study:

    • To investigate the direct contribution of 5-hydroxytryptamine (5-HT) to vascular permeability in rat passive peritoneal anaphylaxis.
    • To determine if 5-HT potentiates the effects of other anaphylactic mediators, such as histamine.

    Main Methods:

    • Rats were sensitized intraperitoneally with anti-serum.
    • Antigen challenge was used to induce anaphylaxis.
    • Peritoneal fluid 5-HT levels were measured.

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  • Intraperitoneal injections of 5-HT and histamine were administered to assess extravasation.

    • Main Results:

    • Antigen challenge did not significantly increase peritoneal fluid 5-HT levels.
    • 5-HT injection alone produced less extravasation than antigen or histamine.
    • 5-HT potentiated histamine-induced extravasation in passively sensitized rats.

    Conclusions:

    • 5-HT is unlikely to directly contribute significantly to extravasation in rat passive peritoneal anaphylaxis.
    • 5-HT plays a potentiating role, enhancing the vascular permeability effects of histamine during this condition.