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Related Experiment Videos

Novel 'soft' anticholinergic agents.

R H Hammer1, K Amin, Z E Gunes

  • 1College of Pharmacy, J. Hillis Miller Health Center, University of Florida, Gainesville 32610-0497.

Drug Design and Delivery
|February 1, 1988
PubMed
Summary

Researchers designed new

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Area of Science:

  • Pharmacology
  • Medicinal Chemistry

Background:

  • The "soft drug" concept involves designing drugs that metabolize into non-toxic substances after their therapeutic action.
  • Atropine, a potent anticholinergic agent, has limitations due to its prolonged effects and potential toxicity.

Purpose of the Study:

  • To design and synthesize novel atropine analogs based on the soft drug principles.
  • To evaluate the anticholinergic activity and metabolic stability of these novel compounds.

Main Methods:

  • Synthesis of aliphatic and cycloaliphatic esters derived from an inactive acidic metabolite of atropine.
  • Assessment of anticholinergic activity using carbachol-induced spasms in guinea pig ileum strips.
  • In vitro stability studies in human plasma, pH 12 buffer, and rat liver homogenates.

Main Results:

  • Designed esters exhibited atropine-like activity and were metabolized to the inactive parent metabolite in rat liver homogenates.
  • Peak anticholinergic activity was observed in esters featuring a quaternary group.
  • Hydrolysis rates varied, with the fastest occurring in rat liver homogenate; sterically hindered esters showed greater stability.

Conclusions:

  • The soft drug approach is effective in creating atropine analogs with predictable metabolism.
  • Quaternization of the synthesized esters enhances anticholinergic potency.
  • These novel compounds represent a promising strategy for developing safer and more controllable anticholinergic therapeutics.

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