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Structure-antinociceptive activity studies with neurotensin.

S Furuta, K Kisara, S Sakurada

    British Journal of Pharmacology
    |September 1, 1984
    PubMed
    Summary

    Neurotensin (NT) and its fragment NT(8-13) effectively reduce pain in mice. These pain-relieving effects involve the brain

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    Area of Science:

    • Neuroscience
    • Pharmacology

    Background:

    • Neurotensin (NT) is a neuropeptide with known biological activities.
    • Investigating the antinociceptive properties of NT and its derivatives is crucial for understanding pain modulation.

    Purpose of the Study:

    • To compare the pain-relieving (antinociceptive) effects of synthetic neurotensin (NT) and its fragments/analogues.
    • To determine the role of specific NT fragments in mediating antinociception.
    • To explore the involvement of the opioid system in NT-induced analgesia.

    Main Methods:

    • Administration of synthetic neurotensin (NT), its fragments, and analogues into the lateral cerebroventricle of conscious mice.
    • Assessment of antinociceptive effects using the tail pressure test.
    • Evaluation of the effects of opioid antagonist naloxone and thyrotropin-releasing hormone on antinociception.

    Main Results:

    • Intracerebroventricular administration of NT produced a dose-dependent antinociceptive effect.
    • Several NT fragments and analogues, including NT(8-13), demonstrated effective antinociceptive properties.
    • The potency and duration of NT(8-13) were comparable to those of NT.
    • Antinociceptive effects of NT, NT(8-13), and NT(9-13) were reversed by naloxone, indicating opioid system involvement.

    Conclusions:

    • The NT(8-13) fragment is essential for the full expression of NT's antinociceptive effects.
    • Neurotensin-mediated antinociception may be partially mediated through the brain's opioid system.
    • Specific NT fragments hold potential as therapeutic agents for pain management.

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