Skip to main content
Advertisement

Main menu

  • Home
  • Articles
    • Current Issue
    • Fast Forward
    • Latest Articles
    • Special Sections
    • Archive
  • Information
    • Instructions to Authors
    • Submit a Manuscript
    • FAQs
    • For Subscribers
    • Terms & Conditions of Use
    • Permissions
  • Editorial Board
  • Alerts
    • Alerts
    • RSS Feeds
  • Virtual Issues
  • Feedback
  • Submit
  • Other Publications
    • Drug Metabolism and Disposition
    • Journal of Pharmacology and Experimental Therapeutics
    • Molecular Pharmacology
    • Pharmacological Reviews
    • Pharmacology Research & Perspectives
    • ASPET

User menu

  • My alerts
  • Log in
  • My Cart

Search

  • Advanced search
Journal of Pharmacology and Experimental Therapeutics
  • Other Publications
    • Drug Metabolism and Disposition
    • Journal of Pharmacology and Experimental Therapeutics
    • Molecular Pharmacology
    • Pharmacological Reviews
    • Pharmacology Research & Perspectives
    • ASPET
  • My alerts
  • Log in
  • My Cart
Journal of Pharmacology and Experimental Therapeutics

Advanced Search

  • Home
  • Articles
    • Current Issue
    • Fast Forward
    • Latest Articles
    • Special Sections
    • Archive
  • Information
    • Instructions to Authors
    • Submit a Manuscript
    • FAQs
    • For Subscribers
    • Terms & Conditions of Use
    • Permissions
  • Editorial Board
  • Alerts
    • Alerts
    • RSS Feeds
  • Virtual Issues
  • Feedback
  • Submit
  • Visit jpet on Facebook
  • Follow jpet on Twitter
  • Follow jpet on LinkedIn
Abstract

Relative analgesic potency of mu, delta and kappa opioids after spinal administration in amphibians.

C W Stevens
Journal of Pharmacology and Experimental Therapeutics February 1996, 276 (2) 440-448;
C W Stevens
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • Article
  • Info & Metrics
  • eLetters
  • PDF
Loading

Abstract

The analgesic effects of 12 opioid agonists in amphibians were measured using the acetic acid test. Spinal administration of dermorphin, [D-Ala2,NMePhe4,Gly-ol]-enkephalin, fentanyl and morphine (mu opioids); [D-Ser2,Leu5-Thr6]-enkephalin, [D-Ala2,D-Leu5]-enkephalin, [D-Pen2,D-Pen5]-enkephalin and deltorphin (delta opioids); and Cl977 [(5R)-(544 alpha,744 alpha,845 beta)-N-methyl-N-[7-(1-pyrrolidinyl)-1- oxaspiro[4,5]dec-8yl]-4-benzofuranacetamide monohydrochloride, bremazocine), U50488 (trans-3,4-dichloro-N-methyl-N-[2-(1-pyrrolidinyl)- cyclohexyl]benzeneacetamide methanesulfonate) and nalorphine (kappa opioids) produced a dose-dependent and long-lasting analgesia in the Northern grass frog, Rana pipiens. With all opioids, time course experiments showed that this analgesic effect lasted for at least 4 hr, with no untoward effects observed within each dosage range used. The analgesic effects of the 12 opioids were blocked by systemic naltrexone pretreatment. Comparison of dose-response curves demonstrated that the rank order of potency was such that, in general, mu opioids > delta opioids > kappa opioids. Dose-response curves obtained in the presence of a fixed dose of naltrexone showed the greatest shift for [D-Ser2,Leu5-Thr6]-enkephalin, less so for [D-Ala2,NMePhe4,Gly-ol]-enkephalin and the least shift for bremazocine. ED50 values for mu and delta opioids in the amphibian acetic acid test were significantly correlated to ED50 values of the same opioids reported in the literature for the rodent TF test. These results show that a spinal site of opioid analgesia is present in amphibians and supports the utility of this alternative, nonmammalian model for studies of opioid analgesia and pain research.

JPET articles become freely available 12 months after publication, and remain freely available for 5 years. 

Non-open access articles that fall outside this five year window are available only to institutional subscribers and current ASPET members, or through the article purchase feature at the bottom of the page. 

 

  • Click here for information on institutional subscriptions.
  • Click here for information on individual ASPET membership.

 

Log in using your username and password

Forgot your user name or password?

Purchase access

You may purchase access to this article. This will require you to create an account if you don't already have one.
PreviousNext
Back to top

In this issue

Journal of Pharmacology and Experimental Therapeutics
Vol. 276, Issue 2
1 Feb 1996
  • Table of Contents
  • Table of Contents (PDF)
  • Index by author
  • Back Matter (PDF)
  • Editorial Board (PDF)
  • Front Matter (PDF)
Download PDF
Article Alerts
Sign In to Email Alerts with your Email Address
Email Article

Thank you for sharing this Journal of Pharmacology and Experimental Therapeutics article.

NOTE: We request your email address only to inform the recipient that it was you who recommended this article, and that it is not junk mail. We do not retain these email addresses.

Enter multiple addresses on separate lines or separate them with commas.
Relative analgesic potency of mu, delta and kappa opioids after spinal administration in amphibians.
(Your Name) has forwarded a page to you from Journal of Pharmacology and Experimental Therapeutics
(Your Name) thought you would be interested in this article in Journal of Pharmacology and Experimental Therapeutics.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Citation Tools
Abstract

Relative analgesic potency of mu, delta and kappa opioids after spinal administration in amphibians.

C W Stevens
Journal of Pharmacology and Experimental Therapeutics February 1, 1996, 276 (2) 440-448;

Citation Manager Formats

  • BibTeX
  • Bookends
  • EasyBib
  • EndNote (tagged)
  • EndNote 8 (xml)
  • Medlars
  • Mendeley
  • Papers
  • RefWorks Tagged
  • Ref Manager
  • RIS
  • Zotero

Share
Abstract

Relative analgesic potency of mu, delta and kappa opioids after spinal administration in amphibians.

C W Stevens
Journal of Pharmacology and Experimental Therapeutics February 1, 1996, 276 (2) 440-448;
Reddit logo Twitter logo Facebook logo Mendeley logo
  • Tweet Widget
  • Facebook Like
  • Google Plus One

Jump to section

  • Article
  • Info & Metrics
  • eLetters
  • PDF

Related Articles

Cited By...

Similar Articles

Advertisement
  • Home
  • Alerts
Facebook   Twitter   LinkedIn   RSS

Navigate

  • Current Issue
  • Fast Forward by date
  • Fast Forward by section
  • Latest Articles
  • Archive
  • Search for Articles
  • Feedback
  • ASPET

More Information

  • About JPET
  • Editorial Board
  • Instructions to Authors
  • Submit a Manuscript
  • Customized Alerts
  • RSS Feeds
  • Subscriptions
  • Permissions
  • Terms & Conditions of Use

ASPET's Other Journals

  • Drug Metabolism and Disposition
  • Molecular Pharmacology
  • Pharmacological Reviews
  • Pharmacology Research & Perspectives
ISSN 1521-0103 (Online)

Copyright © 2023 by the American Society for Pharmacology and Experimental Therapeutics