Muscarinic receptors: their distribution and function in body systems, and the implications for treating overactive bladder
Article first published online: 29 JAN 2009
2006 British Pharmacological Society
British Journal of Pharmacology
Volume 148, Issue 5, pages 565–578, July 2006
How to Cite
Abrams, P., Andersson, K.-E., Buccafusco, J. J., Chapple, C., de Groat, W. C., Fryer, A. D., Kay, G., Laties, A., Nathanson, N. M., Pasricha, P. J. and Wein, A. J. (2006), Muscarinic receptors: their distribution and function in body systems, and the implications for treating overactive bladder. British Journal of Pharmacology, 148: 565–578. doi: 10.1038/sj.bjp.0706780
- Issue published online: 29 JAN 2009
- Article first published online: 29 JAN 2009
- (Received June 22, 2005, Revised December 12, 2005, Accepted April 11, 2006)
- Overactive bladder;
- muscarinic receptors;
- selective M3 antagonists;
- salivary glands;
- gastrointestinal tract;
- 1The effectiveness of antimuscarinic agents in the treatment of the overactive bladder (OAB) syndrome is thought to arise through blockade of bladder muscarinic receptors located on detrusor smooth muscle cells, as well as on nondetrusor structures.
- 2Muscarinic M3 receptors are primarily responsible for detrusor contraction. Limited evidence exists to suggest that M2 receptors may have a role in mediating indirect contractions and/or inhibition of detrusor relaxation. In addition, there is evidence that muscarinic receptors located in the urothelium/suburothelium and on afferent nerves may contribute to the pathophysiology of OAB. Blockade of these receptors may also contribute to the clinical efficacy of antimuscarinic agents.
- 3Although the role of muscarinic receptors in the bladder, other than M3 receptors, remains unclear, their role in other body systems is becoming increasingly well established, with emerging evidence supporting a wide range of diverse functions. Blockade of these functions by muscarinic receptor antagonists can lead to similarly diverse adverse effects associated with antimuscarinic treatment, with the range of effects observed varying according to the different receptor subtypes affected.
- 4This review explores the evolving understanding of muscarinic receptor functions throughout the body, with particular focus on the bladder, gastrointestinal tract, eye, heart, brain and salivary glands, and the implications for drugs used to treat OAB. The key factors that might determine the ideal antimuscarinic drug for treatment of OAB are also discussed. Further research is needed to show whether the M3 selective receptor antagonists have any advantage over less selective drugs, in leading to fewer adverse events.
British Journal of Pharmacology (2006) 148, 565–578. doi:10.1038/sj.bjp.0706780