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Related Experiment Videos

Thyrotrophin-releasing hormone inactivation by human postmortem brain.

E C Griffiths, C Baris, T J Visser

    Regulatory Peptides
    |March 1, 1985
    PubMed
    Summary

    Researchers investigated how peptidases in the human brain break down thyrotrophin-releasing hormone (TRH). The cerebral cortex showed the highest activity, identifying key enzymes involved in TRH inactivation and potential therapeutic analogues.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Enzymology

    Background:

    • Thyrotrophin-releasing hormone (TRH) plays a crucial role in neuroendocrine regulation.
    • Understanding TRH inactivation mechanisms is vital for neurological research and therapeutic development.

    Purpose of the Study:

    • To investigate the mechanisms of TRH inactivation by peptidases in normal human postmortem brain regions.
    • To identify specific enzymes responsible for TRH degradation and characterize their activity in different brain areas.
    • To evaluate the stability of TRH analogues against enzymatic degradation.

    Main Methods:

    • Radioimmunoassay (RIA) and high-performance liquid chromatography (HPLC) were employed.
    • Subcellular fractions (soluble and particulate) from various human brain regions were analyzed.

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  • Degradation products and the activity of TRH-degrading enzymes were quantified.

    • Main Results:

    • The cerebral cortex (Brodman's area, BA10) exhibited the highest TRH-degrading activity.
    • The soluble fraction produced deamidated-TRH (TRH-OH), while the particulate fraction generated cyclo(His-Pro) and TRH-OH.
    • TRH analogues demonstrated varying stability, with RX77368 being the most resistant to degradation.

    Conclusions:

    • Human brain peptidases, including proline endopeptidase and pyroglutamyl aminopeptidase, are involved in TRH inactivation.
    • These findings provide insights into TRH dynamics in neurological disorders and the therapeutic potential of stable TRH analogues.