Aceclidine and pilocarpine interact differently with muscarinic receptor in isolated rabbit iris muscle.

Abstract

The relationship between muscarinic receptor affinity states and the contractile response to the muscarinic agonists carbachol, aceclidine, and pilocarpine, has been examined in the isolated rabbit iris muscle. Contraction of the iris muscle by carbachol and aceclidine was more potent and/or more efficacious than the response to pilocarpine. Analysis of [3H]-Quinuclidinyl benzilate (QNB) binding showed that while both carbachol and aceclidine bound to high- and low-affinity forms of the muscarinic receptor, pilocarpine bound to one affinity state. The efficacy of carbachol and aceclidine to stimulate contraction of the iris muscle was consistent with receptor occupancy theory only when considering the low-affinity state of the muscarinic receptor, and activation of the low-affinity rather than high-affinity binding state of the receptor is likely to mediate the contraction of iris muscle. Therefore, the typical anti-glaucoma muscarinic agonists aceclidine and pilocarpine may interact differently with their target receptors in isolated rabbit iris muscle.

• Authors: Liang Zhu, Yong-Yao Cui, Ju-Mei Feng, Xing-Jun Wu, Hong-Zhuan Chen
• Journal: Life sciences (Life Sci) Vol. 78 Issue 14 Pg. 1617-23 (Feb 28 2006) ISSN: 0024-3205 [Print] Netherlands
• PMID: 16229863 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Muscarinic Agonists
• Quinuclidines
• Receptors, Muscarinic
• Pilocarpine
• aceclidine
• Carbachol

Topics

• Animals
• Carbachol (pharmacology)
• Iris (physiology)
• Muscarinic Agonists (pharmacology)
• Muscle Contraction
• Muscle, Smooth (drug effects, physiology)
• Pilocarpine (pharmacology)
• Quinuclidines (pharmacology)
• Rabbits
• Receptors, Muscarinic (drug effects)