Nocistatin, a peptide reversing acute and chronic morphine tolerance

Rui Qing Sun, Cheng Shui Zhao, Hong Jie Wang, Zheng Jing, Wei Wang, Kui Yang, Yun Wang, Jaw Kang Chang, Ji Sheng Han

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


It has been reported that intracerebroventricular (i.c.v.) injection of nociception/orphanin FQ (OFQ) can antagonize morphine analgesia, whereas i.c.v. OFQ antibody can reverse morphine tolerance. Nocistatin (NST) is a recently characterized neuropeptide possessing an antagonizing effect on OFQ. Here we examine whether i.c.v. NST would result in a reversal of morphine tolerance. The results showed that: (I) i.c.v. NST at doses of 0.005, 0.05, 0.5, 5 or 50 ng per rat produced a bell-shaped dose-dependent reversal of chronic morphine tolerance, with maximum response at 0.5 ng. (2) Acute morphine tolerance could also be reversed, albeit partially, by i.c.v. NST at 0.5 ng. (3) The reversal of acute and chronic morphine tolerance by NST was completely abolished when NST (0.5 ng) was co-injected with (8 μg) OFQ. Since OFQ and NST are derived from the same preprohormone, the profile of its splicing in the CNS may play an important role in determining the effectiveness of morphine analgesia.

Original languageEnglish (US)
Pages (from-to)1789-1792
Number of pages4
Issue number8
StatePublished - Jun 13 2001
Externally publishedYes


  • Morphine
  • Nociceptin/orphanin FQ
  • Nocistatin
  • Tolerance

ASJC Scopus subject areas

  • Neuroscience(all)


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