Sucrose-induced analgesia in mice: role of nitric oxide and opioid receptor-mediated system.

Abstract

BACKGROUND:

The mechanism of action of sweet substance-induced analgesia is thought to involve activation of the endogenous opioid system. The nitric oxide (NO) pathway has a pivotal role in pain modulation of analgesic compounds such as opioids.

OBJECTIVES:

We investigated the role of NO and the opioid receptor-mediated system in the analgesic effect of sucrose ingestion in mice.

MATERIALS AND METHODS:

We evaluated the effect of intraperitoneal administration of 10 mg/kg of NO synthase inhibitor, N-nitro-L-arginine methyl ester (L-NAME) and 20 mg/kg of opioid receptor antagonist, naltrexone on the tail flick response in sucrose ingesting mice.

RESULTS:

Sucrose ingestion for 12 days induced a statistically significant increase in the latency of tail flick response which was unmodified by L-NAME, but partially inhibited by naltrexone administration.

CONCLUSIONS:

Sucrose-induced nociception may be explained by facilitating the release of endogenous opioid peptides. Contrary to some previously studied pain models, the NO/cyclic guanosine monophosphate (cGMP) pathway had no role in thermal hyperalgesia in our study. We recommend further studies on the involvement of NO in other animals and pain models.

• Authors: Abtin Shahlaee, Ali Farahanchi, Shiva Javadi, Bahram Delfan, Ahmad Reza Dehpour
• Journal: Indian journal of pharmacology (Indian J Pharmacol) 2013 Nov-Dec Vol. 45 Issue 6 Pg. 593-6 ISSN: 1998-3751 [Electronic] India
• PMID: 24347767 (Publication Type: Journal Article)

Chemical References

• Analgesics
• Receptors, Opioid
• Nitric Oxide
• Sucrose

Topics

• Analgesics (pharmacology)
• Animals
• Male
• Mice
• Nitric Oxide (physiology)
• Receptors, Opioid (physiology)
• Sucrose (pharmacology)