Supraspinal Neurotensin-Induced Antianalgesia in Mice Is Mediated by Spinal Cholecystokinin  [in Japanese]

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Author(s)

Abstract

Intracerebral injection of neurotensin into specific brain loci in rats produces hyperalgesia due to the release of cholecystokinin (CCK) in the spinal cord. The present purpose was to show in another species that neurotensin can antagonize the antinociceptive action of morphine through the spinal CCK mechanism in mice. Neurotensin given intracerebroventricularly (i.c.v.) at doses higher than 100 ng produced antinociception in the tail flick test. However, at lower doses between 1 pg to 25 ng, neurotensin antagonized the antinociceptive action of morphine given intrathecally (i.t.), thus demonstrating the antianalgesic activity of neurotensin. The rightward shift in the morphine dose-response curve produced by i.c.v. neurotensin was eliminated by an i.t. pretreatment with CCK<SUB>8</SUB> antibody (5 μl of antiserum solution diluted 1:1000). I.t. administration of lorglumide, a CCK<SUB>A</SUB>-receptor antagonist (10 - 1000 ng), and PD135, 158, a CCK<SUB>B</SUB>-receptor antagonist (250 - 500 ng), also eliminated the antianalgesic action of neurotensin. Thus, the mechanism of the antianalgesic action of neurotensin given i.c.v. involved spinal CCK. This mode of action is similar to that for the antianalgesic action of supraspinal pentobarbital which also involves spinal CCK.

Journal

  • The Japanese Journal of Pharmacology

    The Japanese Journal of Pharmacology 79(2), 141-149, 1999-02-01

    The Japanese Pharmacological Society

References:  38

Codes

  • NII Article ID (NAID)
    10008682136
  • NII NACSIS-CAT ID (NCID)
    AA00691188
  • Text Lang
    JPN
  • Article Type
    REV
  • ISSN
    00215198
  • NDL Article ID
    4663092
  • NDL Source Classification
    ZS51(科学技術--薬学)
  • NDL Call No.
    Z53-D199
  • Data Source
    CJP  NDL  J-STAGE 
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