title: Embracing emerging paradigms of G protein-coupled receptor agonism and signaling to address airway smooth muscle pathobiology in asthma.
abstract: G protein-coupled receptors (GPCRs) regulate numerous airway cell functions, and signaling events transduced by GPCRs are important in both asthma pathogenesis and therapy. Indeed, most asthma therapies target GPCRs either directly or indirectly. Within recent years, our understating of how GPCRs signal and are regulated has changed significantly as new concepts have emerged and traditional ideas have evolved. In this review, we discuss current concepts regarding constitutive GPCR activity and receptor agonism, functional selectivity, compartmentalized signaling, and GPCR desensitization. We further discuss the relevance of these ideas to asthma and asthma therapy, while emphasizing their potential application to the GPCR signaling in airway smooth muscle that regulates airway patency and thus disease severity.
authors.affiliation: Department of Internal Medicine, Wake Forest University Health Sciences Center, Winston-Salem, NC 27157, USA. rpenn@wfubmc.edu
authors.forename: Raymond B
authors.initials: RB
authors.lastname: Penn
mesh_terms: D000403:Airway Resistance / Q000187:drug effects; D000818:Animals; D018927:Anti-Asthmatic Agents / Q000627:therapeutic use*; D001249:Asthma / Q000188:drug therapy* / Q000378:metabolism / Q000503:physiopathology; D016084:Bronchoconstriction / Q000187:drug effects; D006801:Humans; D009130:Muscle, Smooth / Q000187:drug effects* / Q000378:metabolism / Q000503:physiopathology; D043562:Receptors, G-Protein-Coupled / Q000819:agonists* / Q000378:metabolism; D012137:Respiratory System / Q000187:drug effects* / Q000378:metabolism / Q000503:physiopathology; D015398:Signal Transduction / Q000187:drug effects*
chemical_list: D018927:Anti-Asthmatic Agents; D043562:Receptors, G-Protein-Coupled