Nocistatin, a peptide reversing acute
and chronic morphine tolerance

by
Sun RQ, Zhao CS, Wang HJ, Jing Z, Wang W,
Yang K, Wang Y, Chang JK, Han JS.
Neuroscience Research Institute,
Peking University, Beijing, PR China.
Neuroreport. 2001 Jun 13;12(8):1789-92


ABSTRACT

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: (1) 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 microg) 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.
Morphine
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Orphanin/nociceptin: history
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Nociceptin antagonists: aminoquinolones
Nociceptin antagonists as antidepressants
Beta-endorphin, nocistatin and life-long pain tolerance


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