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Immediate hypersensitivity responses in flatfish.

T C Fletcher, B A Baldo

    Science (New York, N.Y.)
    |July 26, 1974
    PubMed
    Summary
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    Fungal extracts triggered skin reactions in marine flatfish, but only in species with specific calcium-dependent serum antibodies. This hypersensitivity was transferable via serum, indicating a heat-sensitive factor.

    Area of Science:

    • Immunology
    • Marine Biology
    • Mycology

    Background:

    • Fungal extracts can elicit biological responses in aquatic organisms.
    • C-reactive protein (CRP) is a key component of the innate immune system in vertebrates.
    • Serum precipitins play a role in immune recognition and response.

    Purpose of the Study:

    • To investigate the immune response of marine flatfish to fungal extracts.
    • To determine the role of serum precipitins and C-reactive protein in mediating hypersensitivity reactions.
    • To characterize the nature of the transferable factor responsible for hypersensitivity.

    Main Methods:

    • Subdermal injection of fungal extracts into marine flatfish.
    • Observation of immediate erythema (skin redness) as an indicator of reaction.

    Related Experiment Videos

  • Testing for calcium-dependent serum precipitins against fungal extracts.
  • Serum transfer experiments from reactive to nonreactive fish species.
  • Heat sensitivity assays of the transferable serum factor.

    • Main Results:

    • Fungal extracts induced immediate erythema in marine flatfish.
    • Skin reactions were observed exclusively in species possessing calcium-dependent serum precipitins to the fungi.
    • Immediate hypersensitivity was successfully induced in nonreactive species through the transfer of serum from reactive species.
    • The factor responsible for this transferable hypersensitivity was found to be heat sensitive.

    Conclusions:

    • Marine flatfish exhibit an immediate hypersensitivity reaction to specific fungal extracts.
    • Calcium-dependent serum precipitins are crucial for mediating these fungal-induced skin reactions in flatfish.
    • The hypersensitivity response involves a transferable, heat-sensitive serum factor, suggesting an antibody-mediated or similar immune mechanism.