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AJP - Lung Cellular and Molecular Physiology, Vol 267, Issue 3 223-L241, Copyright © 1994 by American Physiological Society
ARTICLES |
H. Lum and A. B. Malik
Department of Pharmacology, Rush Medical College/Rush-Presbyterian St. Luke's Medical Center, Chicago, Illinois 60612.
The increase in endothelial permeability in response to inflammatory mediators such as alpha-thrombin and histamine is accompanied by cell rounding and interendothelial gap formation, implicating that the predominant transport pathway is a diffusive one [i.e., via cellular junctions (paracellular transport)]. However, the possible contribution by vesicle-mediated transport (i.e., via albumin binding protein gp60) to the overall permeability increase needs investigation. Regulation of paracellular transport in endothelial cells is associated with modulation of actin-based systems which anchor the cell to its neighbor or extracellular matrix, thus maintaining endothelial integrity. At the cell-cell junctions, actin is linked indirectly to the plasma membrane by linking proteins (e.g., vinculin, catenins, alpha-actinin) to cadherins, which function in homophilic intercellular adhesion. Cadherins may also play a role in regulating the formation of tight junctions, which also may be associated with actin. At endothelial focal contacts, the transmembrane receptors (integrins) for matrix proteins are linked to actin via linking proteins (i.e., vinculin, talin, alpha-actinin). In response to inflammatory mediators, second messengers signal two regulatory pathways which modulate the actin-based systems, which may lead to impairment of the endothelial barrier integrity. One pathway is based on protein kinase C (PKC) isozyme-specific phosphorylation of linking proteins at the cell-cell and cell-matrix junctions. The increased phosphorylation is associated with actin reorganization, cell rounding, and increased paracellular transport. The other is the activation of myosin light-chain kinase, (MLCK), which causes an actin-myosin-based contraction that may lead to a centripetal retraction of endothelial cells. Current research is in the identification of protein substrates of PKC isozymes, the specific role of their phosphorylation in barrier function, and determining the precise role of MLCK in modulation of endothelial barrier function.
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