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Related Experiment Videos

Inactivation of two hyperactive LH-RH analogues by rat hypothalamic peptidases.

E C Griffiths, C R Hopkinson

    Hormone Research
    |January 1, 1979
    PubMed
    Summary

    Hyperactive luteinizing hormone-releasing hormone (LH-RH) analogues show increased resistance to enzymatic degradation by hypothalamic peptidases. This enhanced stability contributes to their greater biological activity and suggests specific cleavage sites for enzyme inactivation.

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    Local degradation of luteinizing hormone-releasing hormone (LH-RH) in the rat central nervous system.

    Neuroscience letters·2009

    Area of Science:

    • Endocrinology
    • Neuroscience
    • Biochemistry

    Background:

    • Hyperactive analogues of luteinizing hormone-releasing hormone (LH-RH) are thought to possess enhanced activity due to increased receptor binding affinity or reduced susceptibility to enzymatic degradation.
    • Investigating the latter hypothesis is crucial for understanding the mechanisms behind these potent analogues.

    Purpose of the Study:

    • To determine if LH-RH analogues exhibit decreased susceptibility to inactivation by hypothalamic peptidases.
    • To identify potential sites of enzymatic cleavage within the LH-RH decapeptide by hypothalamic enzymes.

    Main Methods:

    • Incubation of D-Ser(TBU)6-EA10-LH-RH and D-Leu6-EA10-LH-RH analogues with a hypothalamic supernatant fraction containing LH-RH-degrading peptidases.
    • Testing the gonadotrophin-releasing ability of incubated LH-RH and its analogues in normal, adult male rats.

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  • Comparing the relative losses of biological activity after enzymatic treatment.

    • Main Results:

    • Both LH-RH analogues demonstrated greater resistance to hypothalamic peptidases compared to native LH-RH.
    • D-Leu6-EA10-LH-RH retained its gonadotrophin-releasing activity longer than D-Ser(TBU)6-EA10-LH-RH.
    • Findings suggest initial enzymatic cleavage sites at the Gly-leu and Pro-Gly NH2 bonds within the LH-RH decapeptide.

    Conclusions:

    • The increased biological activity of LH-RH analogues may be partly attributed to their enhanced resistance to enzymatic inactivation.
    • Understanding peptidase action on LH-RH and its analogues can inform the design of future peptidomimetics with improved therapeutic properties.