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Neurotensin analogues. Structure--activity relationships

J E Rivier, L H Lazarus, M H Perrin

    Journal of Medicinal Chemistry
    |November 1, 1977
    PubMed
    Summary

    Researchers synthesized neurotensin (NT) analogues to study their biological activity. Modifications in the first nine positions yielded active peptides, while later positions reduced activity, with some exceptions.

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    Area of Science:

    • Peptide Chemistry
    • Neuropharmacology
    • Biochemistry

    Background:

    • Neurotensin (NT) is a peptide hormone with various physiological roles.
    • Understanding the structure-activity relationship of NT analogues is crucial for developing targeted therapeutics.

    Purpose of the Study:

    • To synthesize and characterize novel neurotensin analogues.
    • To evaluate the in vivo and in vitro biological activities of these analogues.

    Main Methods:

    • Solid-phase synthesis was employed to create a series of NT analogues.
    • Purification and characterization involved chromatography, amino acid analysis, and optical rotation.
    • Biological activity was assessed by measuring hypothermia induction in rats and mast cell binding assays.

    Main Results:

    • Substitutions in positions 1-9 of NT generally retained biological activity.
    • Modifications at positions 10-13 significantly reduced activity in both in vivo and in vitro assays.
    • Specific analogues, [D-Phe11]-NT and [D-Tyr11]-NT, showed enhanced in vivo potency.

    Conclusions:

    • The N-terminal region (residues 1-9) of neurotensin is critical for maintaining biological activity.
    • The C-terminal region (residues 10-13) is less critical for receptor binding but influences overall efficacy.
    • Discrepancies between in vivo and in vitro results highlight the complexity of NT analogue pharmacology.

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