TY - JOUR
T1 - Muscarinic receptors
T2 - Their distribution and function in body systems, and the implications for treating overactive bladder
AU - Abrams, Paul
AU - Andersson, Karl Erik
AU - Buccafusco, Jerry J.
AU - Chapple, Christopher
AU - De Groat, William Chet
AU - Fryer, Alison D.
AU - Kay, Gary
AU - Laties, Alan
AU - Nathanson, Neil M.
AU - Pasricha, Pankaj Jay
AU - Wein, Alan J.
PY - 2006/7/5
Y1 - 2006/7/5
N2 - 1 The 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. 2 Muscarinic M 3 receptors are primarily responsible for detrusor contraction. Limited evidence exists to suggest that M 2 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. 3 Although the role of muscarinic receptors in the bladder, other than M 3 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. 4 This 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 M 3 selective receptor antagonists have any advantage over less selective drugs, in leading to fewer adverse events.
AB - 1 The 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. 2 Muscarinic M 3 receptors are primarily responsible for detrusor contraction. Limited evidence exists to suggest that M 2 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. 3 Although the role of muscarinic receptors in the bladder, other than M 3 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. 4 This 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 M 3 selective receptor antagonists have any advantage over less selective drugs, in leading to fewer adverse events.
KW - Antimuscarinics
KW - Bladder
KW - Brain
KW - Eye
KW - Gastrointestinal tract
KW - Heart
KW - Muscarinic receptors
KW - Overactive bladder
KW - Salivary glands
KW - Selective M antagonists
UR - http://www.scopus.com/inward/record.url?scp=33745602006&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33745602006&partnerID=8YFLogxK
U2 - 10.1038/sj.bjp.0706780
DO - 10.1038/sj.bjp.0706780
M3 - Review article
C2 - 16751797
AN - SCOPUS:33745602006
SN - 0007-1188
VL - 148
SP - 565
EP - 578
JO - British Journal of Pharmacology
JF - British Journal of Pharmacology
IS - 5
ER -