| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
|
|
|
|||||||
|
|||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Received January 27, 2003
Accepted after revision April 23, 2003
1 Institut für Vegetative Physiologie und Pathophysiologie, Universität Hamburg, Martinistrasse 52, D-20246 Hamburg, Germany
2 Institut für Vegetative Physiologie und Pathophysiologie, Universität Hamburg, Martinistrasse 52, D-20246 Hamburg, Germany
* To whom correspondence should be addressed. E-mail: ehmke{at}uke.uni-hamburg.de.
Recent studies have suggested that aquaporin-1 (AQP1) as well as the HCO3--Cl- transporter may be involved in CO2 transport across biological membranes, but the physiological importance of this route of gas transport remained unknown. We studied CO2 transport in human red blood cell ghosts at physiological temperatures (37 °C). Replacement of inert with CO2-containing gas above a stirred cell suspension caused an outside-to-inside directed CO2 gradient and generated a rapid biphasic intracellular acidification. The gradient of the acidifying gas was kept small to favour high affinity entry of CO2 passing the membrane. All rates of acidification except that of the approach to physicochemical equilibrium of the uncatalysed reaction were restricted to the intracellular environment. Inhibition of carbonic anhydrase (CA) demonstrated that CO2-induced acidification required the catalytic activity of CA. Blockade of the function of either AQP1 (by HgCl2 at 65 µM) or the HCO3--Cl- transporter (by DIDS at 15 µM) completely prevented fast acidification. These data indicate that, at low chemical gradients for CO2, nearly the entire CO2 transport across the red cell membrane is mediated by AQP1 and the HCO3--Cl- transporter. Therefore, these proteins may function as high affinity sites for CO2 transport across the erythrocyte membrane.
This article has been cited by other articles:
|
|
 |
|
  A. Missner, P. Kugler, S. M. Saparov, K. Sommer, J. C. Mathai, M. L. Zeidel, and P. Pohl Carbon Dioxide Transport through Membranes J. Biol. Chem., September 12, 2008; 283(37): 25340 - 25347. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 V. Endeward, J.-P. Cartron, P. Ripoche, and G. Gros RhAG protein of the Rhesus complex is a CO2 channel in the human red cell membrane FASEB J, January 1, 2008; 22(1): 64 - 73. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Echevarria, A. M. Munoz-Cabello, R. Sanchez-Silva, J. J. Toledo-Aral, and J. Lopez-Barneo Development of Cytosolic Hypoxia and Hypoxia-inducible Factor Stabilization Are Facilitated by Aquaporin-1 Expression J. Biol. Chem., October 12, 2007; 282(41): 30207 - 30215. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Y. Wang and E. Tajkhorshid Molecular Mechanisms of Conduction and Selectivity in Aquaporin Water Channels J. Nutr., June 1, 2007; 137(6): 1509S - 1515S. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V. Endeward, R. Musa-Aziz, G. J. Cooper, L.-M. Chen, M. F. Pelletier, L. V. Virkki, C. T. Supuran, L. S. King, W. F. Boron, and G. Gros Evidence that aquaporin 1 is a major pathway for CO2 transport across the human erythrocyte membrane FASEB J, October 1, 2006; 20(12): 1974 - 1981. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 W. F. Boron Acid-Base Transport by the Renal Proximal Tubule J. Am. Soc. Nephrol., September 1, 2006; 17(9): 2368 - 2382. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
