What are the different muscarinic acetylcholine receptor subtypes and how are they distributed in the airways and molecular signalling mechanisms? What is their function in neurogenic and non-neurogenic control of the airways and in inflammatory mechanisms? How is their gene expression regulated? The great importance of muscarinic acetylcholine receptors for the pathophysiology and treatment of chronic inflammatory obstructive airways diseases calls for a comprehensive and integrated overview of the current knowledge to address such questions, to discuss the role of these receptor subtypes in...