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Related Experiment Videos

[Relationship between structure and function of a chemotactic factor for human leukocytes]

R Carletti, S Spisani, S Traniello

    Bollettino Della Societa Italiana Di Biologia Sperimentale
    |November 30, 1981
    PubMed
    Summary

    Casein peptides attract human neutrophils, a key immune response. Specific peptides, rich in phosphate groups and tyrosines, show the strongest chemotactic activity, suggesting their importance in immune cell signaling.

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    Chemotactic tripeptides incorporating at position 2 alpha-aminoacid residues with unsaturated side chains.

    Amino acids·2007

    Area of Science:

    • Biochemistry
    • Immunology
    • Protein Chemistry

    Context:

    • Casein, a major milk phosphoprotein, forms aggregates.
    • Neutrophils are critical immune cells involved in inflammation and pathogen clearance.
    • Chemotaxis is the directed movement of cells in response to chemical signals.

    Purpose:

    • To investigate the chemotactic activity of casein for human neutrophils.
    • To identify the specific casein fraction responsible for this activity.
    • To elucidate the molecular characteristics of the active peptide.

    Summary:

    • Casein was fractionated by size exclusion chromatography (Sephadex G 100).
    • Chemotactic activity was localized to a lighter molecular weight fraction.
    • This fraction, upon trypsin digestion and further purification (AcA-54), yielded a 6 kDa peptide.

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  • This peptide, rich in phosphate groups and tyrosines, demonstrated significant chemotactic activity for polymorphonuclear leukocytes (PMN).

    • Impact:

    • Identifies a specific peptide derived from casein with potent neutrophil chemotactic properties.
    • Highlights the potential role of phosphotyrosine residues in mediating immune cell recognition and response.
    • Suggests casein-derived peptides could modulate inflammatory processes.