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Related Experiment Videos

Activated human eosinophils synthesize new proteins.

K S Ramesh, R E Rocklin, S H Pincus

    Biochimica Et Biophysica Acta
    |February 20, 1987
    PubMed
    Summary

    Human blood eosinophils activated by opsonized zymosan synthesize new proteins, unlike those activated by other stimuli. These newly synthesized proteins, secreted during activation, may play crucial immunological roles.

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    Area of Science:

    • Immunology
    • Biochemistry
    • Cell Biology

    Background:

    • Human blood eosinophils are key immune cells involved in inflammatory and allergic responses.
    • Understanding eosinophil activation pathways is crucial for developing targeted therapies.
    • Prolonged in vitro activation studies reveal specific cellular responses.

    Purpose of the Study:

    • To investigate the biochemical changes in human eosinophils upon prolonged in vitro activation.
    • To identify specific protein alterations induced by different activating stimuli.
    • To determine if eosinophils synthesize new proteins during activation.

    Main Methods:

    • Analysis of aqueous whole cell lysates and cell-free supernatants from resting and activated human eosinophils.
    • Polyacrylamide gel electrophoresis (PAGE), including native PAGE and SDS-PAGE, to analyze protein composition.
    • Incorporation of L-[35S]methionine to assess de novo protein synthesis.
    • Use of cycloheximide to block protein synthesis and confirm newly synthesized proteins.

    Main Results:

    • Opsonized zymosan activated eosinophils showed altered protein composition compared to resting cells on both native and SDS-PAGE.
    • Three new polypeptides (24 kDa, 43 kDa, 60 kDa) were identified in opsonized zymosan-activated eosinophil extracts.
    • Activation with N-formylmethionylleucylphenylalanine (fMet-Leu-Phe), calcium ionophore (A23187), or phorbol 12-myristate 13-acetate (PMA) did not alter protein composition.
    • Opsonized zymosan induced L-[35S]methionine incorporation into eosinophil proteins, indicating de novo synthesis.
    • Cycloheximide pretreatment completely blocked this L-[35S]methionine incorporation.

    Conclusions:

    • Human eosinophils activated by opsonized zymosan synthesize new proteins, a response not observed with other tested stimuli.
    • These newly synthesized proteins are secreted into the medium during activation.
    • The secreted proteins may have significant immunological functions, warranting further investigation.

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