Neurotensin-induced antinociception and hypothermia in mice: antagonism by TRH and structural analogs of TRH

Daniel E. Hernandez, Charles Nemeroff, Miguel H. Valderrama, Arthur J. Prange

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Intracisternal (IC) administration of neurotensin (NT) in a dose of 10 μg produced a significant hypothermia and antinociception in the hot-plate test in mice. Both of these effects of IC NT were completely antagonized by concomitant administration of equimolar doses of thyrotropin-releasing hormone (TRH) and several TRH congeners including 3-methyl-His-TRH (pGlu-3-methyl-His-Pro-NH2), MK-771 (pyro-2-aminoadipyl-histidyl-thiazolidine-4-carboxamide), β-ala-TRH (pGlu-His-Pro-β-ala-NH2), and RX-77368 (pGlu-His-dimethyl-Pro-NH2). The antagonism by TRH and TRH analogs on NT-induced hypothermia and antinociception was dose-dependent. Of particular interest was the finding that RX-77368 not only blocked the effects of NT but also produced hyperalgesia. It appears that TRH analogs that are more resistant to biologic degradation are, like TRH, capable of blocking NT-induced behaviors.

Original languageEnglish
Pages (from-to)41-49
Number of pages9
JournalRegulatory Peptides
Volume8
Issue number1
DOIs
StatePublished - Jan 1 1984
Externally publishedYes

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Keywords

  • antinociception
  • hypothermia
  • neurotensin
  • thyrotropin-releasing hormone

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Physiology
  • Neuroscience(all)

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