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lüll Invited review: Active fluid clearance from the distal air spaces of the lung Matthay MA; Clerici C; Saumon GJ Appl Physiol (1985) 2002[Oct]; 93 (4): 1533-41Active ion transport drives iso-osmolar alveolar fluid clearance, a hypothesis originally suggested by in vivo studies in sheep 20 yr ago. Over the last two decades, remarkable progress has been made in establishing a critical role for active sodium transport as a primary mechanism that drives fluid clearance from the distal air spaces of the lung. The rate of fluid transport can be increased in most species, including the human lung, by cAMP stimulation. Catecholamine-independent mechanisms, including hormones, growth factors, and cytokines, can also upregulate epithelial fluid clearance in the lung. The new insights into the role of the distal lung epithelium in actively regulating lung fluid balance has important implications for the resolution of clinical pulmonary edema.|Animals[MESH]|Body Fluids/*metabolism[MESH]|Catecholamines/metabolism[MESH]|Cyclic AMP/metabolism[MESH]|Humans[MESH]|Lung/*metabolism[MESH]|Pulmonary Edema/*metabolism[MESH]|Up-Regulation[MESH] |