Of rafts and moving water.
The ability to respond rapidly to changes in tonicity is crucial for cellular and organismal survival. Sensors of osmotic stress are beginning to be discovered. For example, results from expression cloning in a heterologous system have implicated GAP43 as a component of a peripheral nervous system sensor of hypotonicity. These results and the role of lipid rafts, protein kinase C, and members of the phospholipase C-delta family are discussed in the context of cellular responses to osmotic stress. Calcium is also involved in the osmotic stress response, and both intracellular calcium released through inositol trisphosphate receptors and extracellular calcium transported through TRPV4 (a member of the transient receptor potential family) may contribute.
Cohen
David M
DM
Division of Nephrology and Hypertension, Department of Medicine, Oregon Health Science University and Portland Veterans Affairs Medical Center, Portland, OR 97239, USA. cohend@ohsu.edu
D000818:Animals; D048429:Cell Size / Q000502:physiology; D019922:GAP-43 Protein / Q000378:metabolism / Q000502:physiology; D006801:Humans; D007038:Hypotonic Solutions; D021962:Membrane Microdomains / Q000378:metabolism / Q000502:physiology*; D014867:Water / Q000378:metabolism* / Q000502:physiology
D019922:GAP-43 Protein; D007038:Hypotonic Solutions; D014867:Water