Skip to main content
Advertisement

Main menu

  • Home
  • Articles
    • Current Issue
    • Fast Forward
    • Latest Articles
    • 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
  • 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
    • 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
  • Visit jpet on Facebook
  • Follow jpet on Twitter
  • Follow jpet on LinkedIn
Abstract

Comparison of the effects of trimethadione and its primary metabolite dimethadione on neuromuscular function and the effects of altered pH on the actions of dimethadione.

M T Alderdice and J E McMillan
Journal of Pharmacology and Experimental Therapeutics June 1982, 221 (3) 547-551;
M T Alderdice
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J E McMillan
  • 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 effects of the anticonvulsant trimethadione (TMO) and its primary metabolite dimethadione (DMO) were investigated at the frog neuromuscular junction using intracellular recording techniques. TMO (1, 2 and 5 mM) caused dose-dependent decreases in miniature end-plate potential (MEPP) and end-plate potential (EPP) amplitudes, decreased quantal content only at the highest dose and did not affect MEPP frequency. DMO (2 and 5 mM) at the normal pH of 7.2 significantly decreased quantal content and decreased EPP amplitude at the higher concentration used. Neither MEPP amplitude nor frequency was significantly affected by DMO at pH 7.2. When 2 mM DMO was added at the same time that pH was lowered to 6.6, considerably larger decreases in EPP( amplitude and quantal content were observed. Under these conditions, DMO still did not alter MEPP amplitude but did cause about a doubling in MEPP frequency. The effects of pH 6.6 alone were also examined, but lowered pH did not account for all of the exaggerated effect of DMO in pH 6.6. Presumably, more DMO accumulates intracellularly in low pH conditions because it is a weak acid and sensitive to alterations in pH. In conclusion, both TMO and DMO cause depression of neuromuscular transmission; however, their mechanisms for depression are different, especially when therapeutically relevant concentrations are considered. TMO acts primarily by suppressing postjunctional sensitivity to acetylcholine, whereas DMO primarily decreases transmitter release from the nerve terminal.

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. 221, Issue 3
1 Jun 1982
  • 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.
Comparison of the effects of trimethadione and its primary metabolite dimethadione on neuromuscular function and the effects of altered pH on the actions of dimethadione.
(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

Comparison of the effects of trimethadione and its primary metabolite dimethadione on neuromuscular function and the effects of altered pH on the actions of dimethadione.

M T Alderdice and J E McMillan
Journal of Pharmacology and Experimental Therapeutics June 1, 1982, 221 (3) 547-551;

Citation Manager Formats

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

Comparison of the effects of trimethadione and its primary metabolite dimethadione on neuromuscular function and the effects of altered pH on the actions of dimethadione.

M T Alderdice and J E McMillan
Journal of Pharmacology and Experimental Therapeutics June 1, 1982, 221 (3) 547-551;
del.icio.us logo Digg logo Reddit logo Twitter logo CiteULike logo Facebook logo Google logo Mendeley logo
  • Tweet Widget
  • Facebook Like
  • Google Plus One

Jump to section

  • Article
  • Info & Metrics
  • eLetters
  • PDF

Related Articles

Cited By...

Similar Articles

  • 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 © 2021 by the American Society for Pharmacology and Experimental Therapeutics