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AJP - Renal Physiology, Vol 266, Issue 1 21-F30, Copyright © 1994 by American Physiological Society
ARTICLES |
V. M. Kroshian, A. M. Sheridan and W. Lieberthal
Evans Memorial Department of Clinical Research, Boston University Medical Center, University Hospital, Massachusetts 02118.
Mouse proximal tubular (MPT) cells in culture were subjected to ATP depletion by incubating them with cyanide in the absence of dextrose for 1 h. This insult resulted in marked alterations in the actin cytoskeleton. These changes were not associated with a decrease in cell viability and thus reflected sublethal injury. The effect of sublethal injury on the functional integrity of the intercellular tight junction (TJ) was then examined in MPT cell monolayers grown on permeable supports. During chemical anoxia, monolayer permeability to the paracellular marker mannitol progressively increased to 297 +/- 62% of baseline after 1 h. Chemical anoxia also caused a reversible loss in cell-substrate adhesion when MPT cells were studied as confluent monolayers or as single cells. Thus disruption of the actin cytoskeleton in nonlethally injured cells results in important reversible alterations in renal epithelial function characterized by impairment of the "gate" function of the TJ as well as impaired cell-substrate adhesion. We hypothesize that sublethal epithelial cell injury without accompanying necrosis may contribute to the decrement in renal function characteristic of ischemic renal injury.
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 T. Tsukamoto and S. K. Nigam Tight Junction Proteins Form Large Complexes and Associate with the Cytoskeleton in an ATP Depletion Model for Reversible Junction Assembly J. Biol. Chem., June 27, 1997; 272(26): 16133 - 16139. [Abstract] [Full Text] [PDF]
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T. N. Meyer, C. Schwesinger, J. Ye, B. M. Denker, and S. K. Nigam Reassembly of the Tight Junction after Oxidative Stress Depends on Tyrosine Kinase Activity J. Biol. Chem., June 15, 2001; 276(25): 22048 - 22055. [Abstract] [Full Text] [PDF]
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A. M. Sheridan, A. Sapirstein, N. Lemieux, B. D. Martin, D. K. Kim, and J. V. Bonventre Nuclear Translocation of Cytosolic Phospholipase A2 Is Induced by ATP Depletion J. Biol. Chem., August 3, 2001; 276(32): 29899 - 29905. [Abstract] [Full Text] [PDF]
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