TRPing on the lung endothelium: calcium channels that regulate barrier function.
Rises in cytosolic calcium are sufficient to initiate the retraction of endothelial cell borders and to increase macromolecular permeability. Although endothelial cell biologists have recognized the importance of shifts in cytosolic calcium for several decades, only recently have we gained a rudimentary understanding of the membrane calcium channels that change cell shape. Members of the transient receptor potential family (TRP) are chief among the molecular candidates for permeability-coupled calcium channels. Activation of calcium entry through store-operated calcium entry channels, most notably TRPC1 and TRPC4, increases lung endothelial cell permeability, as does activation of calcium entry through the TRPV4 channel. However, TRPC1 and TRPC4 channels appear to influence the lung extraalveolar endothelial barrier most prominently, whereas TRPV4 channels appear to influence the lung capillary endothelial barrier most prominently. Thus, phenotypic heterogeneity in ion channel expression and function exists within the lung endothelium, along the arterial-capillary-venous axis, and is coupled to discrete control of endothelial barrier function.
Cioffi
Donna L
DL
Center for Lung Biology, University of South Alabama, Mobile, Alabama 36688, USA.
Lowe
Kevin
K
Alvarez
Diego F
DF
Barry
Christina
C
Stevens
Troy
T
D000595:Amino Acid Sequence; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002463:Cell Membrane Permeability; D004727:Endothelium / Q000378:metabolism / Q000502:physiology*; D006333:Heart Failure / Q000378:metabolism / Q000503:physiopathology; D006801:Humans; D008168:Lung / Q000378:metabolism / Q000502:physiology*; D008969:Molecular Sequence Data; D050051:Transient Receptor Potential Channels / Q000737:chemistry / Q000378:metabolism / Q000502:physiology*
D050051:Transient Receptor Potential Channels; D002118:Calcium
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