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Related Experiment Videos

Immunomodulation by some oligopeptides.

I Paegelow, H Werner

    Methods and Findings in Experimental and Clinical Pharmacology
    |February 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Bradykinin and substance P peptides stimulate T cells to release specific lymphokines at very low concentrations. The Arg-Pro sequence is key for this immune cell communication.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Biochemistry

    Background:

    • Lymphoid cells play a crucial role in immune responses.
    • Bradykinin and substance P are known signaling molecules with diverse physiological effects.
    • Understanding peptide-immune cell interactions is vital for developing immunomodulatory therapies.

    Purpose of the Study:

    • To investigate the in vitro effects of bradykinin, substance P, and their analogues on lymphoid cells.
    • To identify the specific lymphokines induced by these peptides and their producer cells.
    • To elucidate the structure-activity relationships governing peptide-induced lymphokine secretion.

    Main Methods:

    • In vitro incubation of lymphoid cells with various oligopeptides.
    • Measurement of lymphokine secretion using sensitive assays.

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  • Analysis of dose-response curves to determine effective peptide concentrations.
  • Peptide sequencing and structure-activity relationship analysis.

    • Main Results:

    • Bradykinin and substance P induced the secretion of charge-changing and chemokinetic lymphokines.
    • Effective peptide concentrations were in the nanomolar to picomolar range (10(-12) to 10(-6) M).
    • Dose-response curves exhibited a characteristic bell shape.
    • T cells were identified as the primary producers of charge-changing lymphokines.
    • The Arg-Pro sequence in bradykinin/substance P and Pro-Arg in tuftsin/rigin were implicated in lymphokine induction.

    Conclusions:

    • Specific oligopeptides, including bradykinin and substance P, can modulate immune cell function by inducing lymphokine secretion.
    • T cells are key responders to these peptides, releasing important signaling molecules.
    • The N-terminal Arg-Pro sequence is critical for the biological activity of these peptides in immune modulation.