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Related Experiment Videos

Enkephalin-containing polypeptides in human cerebrospinal fluid.

F Nyberg, I Nylander, L Terenius

    Brain Research
    |April 23, 1986
    PubMed
    Summary

    Researchers investigated peptides in human cerebrospinal fluid (CSF) derived from proenkephalin genes. They found a diverse family of peptides, with precursors present in high concentrations, suggesting potential markers for peptide system activity.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Endocrinology

    Background:

    • The human cerebrospinal fluid (CSF) contains various peptides derived from proenkephalin A and B.
    • Understanding the chemical nature and concentrations of these peptides is crucial for elucidating their physiological roles.

    Purpose of the Study:

    • To investigate the chemical nature of peptides in human CSF originating from proenkephalin A and B.
    • To identify and quantify proenkephalin-derived peptides and their precursors.

    Main Methods:

    • Direct measurements using radioimmunoassay (RIA) for various enkephalins and dynorphins.
    • Chromatographic separation followed by trypsin treatment to identify and quantify peptides.
    • High-performance liquid chromatography (HPLC) for peptide identification.

    Main Results:

    • Hexapeptides were found in higher concentrations than corresponding enkephalins.
    • Dynorphin A immunoactive material showed higher apparent molecular weights than the standard.
    • Trypsin degradation revealed the presence of Leu-enkephalin-Arg6 and Met-enkephalin-Lys6/Arg6, with varying concentrations across different molecular weight intervals.
    • Higher molecular weight fractions showed a predominance of Met-enkephalyl hexapeptides, while intermediate and low molecular weight regions had more activity from proenkephalin B and A, respectively.

    Conclusions:

    • Human CSF contains a diverse family of peptides derived from both proenkephalin A and B genes.
    • Precursors to these peptides are present in relatively high concentrations.
    • These precursors may serve as valuable markers for activity within these peptide systems.

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