Muscarinic acetylcholine receptors.

Abstract:

:Muscarinic acetylcholine receptors mediate diverse physiological functions. At present, five receptor subtypes (M(1) - M(5)) have been identified. The odd-numbered receptors (M(1), M(3), and M(5)) are preferentially coupled to G(q/11) and activate phospholipase C, which initiates the phosphatidylinositol trisphosphate cascade leading to intracellular Ca(2+) mobilization and activation of protein kinase C. On the other hand, the even-numbered receptors (M(2) and M(4)) are coupled to G(i/o), and inhibit adenylyl cyclase activity. They also activate G protein-gated potassium channels, which leads to hyperpolarization of the plasma membrane in different excitable cells. Individual members of the family are expressed in an overlapping fashion in various tissues and cell types. Recent gene targeting approaches have unraveled the specific function of these muscarinic receptor subtypes, which were not able to be fully elucidated with pharmacological approaches because of the non-selective effects of the available ligands. Based on these findings, muscarinic receptors have been emerging as an important therapeutic target for various diseases, including dry mouth, incontinence and chronic obstructive pulmonary disease. Here we review the latest advances in the structural and functional characterization of muscarinic acetylcholine receptors and the pharmaceutical development of muscarinic receptor ligands.

journal_name

Curr Pharm Des

authors

Ishii M,Kurachi Y

doi

10.2174/138161206778522056

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

3573-81

issue

28

eissn

1381-6128

issn

1873-4286

journal_volume

12

pub_type

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