| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
Regular Articles |
From the Department of Pathology,*
University of Texas
Health Science Center, San Antonio, Texas; and the Department of
Internal Medicine,
University of Michigan
Medical Center, Ann Arbor, Michigan
Glycine and structurally related amino acids with activities at chloride channel receptors in the central nervous system also have robust protective effects against cell injury by ATP depletion. The glycine receptor antagonist strychnine shares this protective activity. An essential step toward identification of the molecular targets for these compounds is to determine whether they protect cells through interactions with intracellular targets or with molecules on the outer surface of plasma membranes. Here we report cytoprotection by a cell-impermeant derivative of strychnine. A strychnine-fluorescein conjugate (SF) was synthesized, and impermeability of plasma membranes to this compound was verified by fluorescence confocal microscopy. In an injury model of Madin-Darby canine kidney cells, ATP depletion led to lactate dehydrogenase release. SF prevented lactate dehydrogenase leakage without ameliorating ATP depletion. This was accompanied by preservation of cellular ultrastructure and exclusion of vital dyes. SF protection was also shown for ATP-depleted rat hepatocytes. On the other hand, when a key structural motif in the active site of strychnine was chemically blocked, the SF lost its protective effect, establishing strychnine-related specificity for SF protection. Cytoprotective effects of the cell-impermeant strychnine derivative provide compelling evidence suggesting that molecular targets on the outer surface of plasma membranes may mediate cytoprotection by strychnine and glycine.
This article has been cited by other articles:
 |
|
 |
|
  R. A. Zager, A. C. M. Johnson, S. Lund, and J. Randolph-Habecker Toll-like receptor (TLR4) shedding and depletion: acute proximal tubular cell responses to hypoxic and toxic injury Am J Physiol Renal Physiol, January 1, 2007; 292(1): F304 - F312. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. Rodriguez-Sinovas, D. Garcia-Dorado, P. Pina, M. Ruiz-Meana, and J. Soler-Soler Effect of sarcolemmal rupture on myocardial electrical impedance during oxygen deprivation Am J Physiol Heart Circ Physiol, March 1, 2005; 288(3): H1396 - H1403. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Ruiz-Meana, P. Pina, D. Garcia-Dorado, A. Rodriguez-Sinovas, I. Barba, E. Miro-Casas, M. Mirabet, and J. Soler-Soler Glycine protects cardiomyocytes against lethal reoxygenation injury by inhibiting mitochondrial permeability transition J. Physiol., August 1, 2004; 558(3): 873 - 882. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Z. Dong, J. Z. Wang, F. Yu, and M. A. Venkatachalam Apoptosis-Resistance of Hypoxic Cells: Multiple Factors Involved and a Role for IAP-2 Am. J. Pathol., August 1, 2003; 163(2): 663 - 671. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Estacion, J. S. Weinberg, W. G. Sinkins, and W. P. Schilling Blockade of maitotoxin-induced endothelial cell lysis by glycine and L-alanine Am J Physiol Cell Physiol, April 1, 2003; 284(4): C1006 - C1020. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
