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Migration of airway smooth muscle cells Gerthoffer WTProc Am Thorac Soc 2008[Jan]; 5 (1): 97-105Migration of smooth muscle cells is a process fundamental to development of hollow organs, including blood vessels and the airways. Migration is also thought to be part of the response to tissue injury. It has also been suggested to contribute to airways remodeling triggered by chronic inflammation. In both nonmuscle and smooth muscle cells numerous external signaling molecules and internal signal transduction pathways contribute to cell migration. The review includes evidence for the functional significance of airway smooth muscle migration, a summary of promigratory and antimigratory agents, and summaries of important signaling pathways mediating migration. Important signaling pathways and effector proteins described include small G proteins, phosphatidylinositol 3-kinases (PI3-K), Rho activated protein kinase (ROCK), p21-activated protein kinases (PAK), Src family tyrosine kinases, and mitogen-activated protein kinases (MAPK). These signaling modules control multiple critical effector proteins including actin nucleating, capping and severing proteins, myosin motors, and proteins that remodel microtubules. Actin filament remodeling, focal contact remodeling and propulsive force of molecular motors are all coordinated to move cells along gradients of chemical cues, matrix adhesiveness, or matrix stiffness. Airway smooth muscle cell migration can be modulated in vitro by drugs commonly used in pulmonary medicine including beta-adrenergic agonists and corticosteroids. Future studies of airway smooth muscle cell migration may uncover novel targets for drugs aimed at modifying airway remodeling.|*Cell Movement/drug effects[MESH]|*Respiratory Physiological Phenomena[MESH]|Actins/physiology[MESH]|Animals[MESH]|Cytoskeleton/physiology[MESH]|GTP-Binding Proteins/physiology[MESH]|Humans[MESH]|Muscle, Smooth/*cytology[MESH]|Myocytes, Smooth Muscle/*physiology[MESH]|Protein Kinases/physiology[MESH]|Signal Transduction[MESH] |
