Aquaporin‐1 and HCO3−‐Cl−transporter‐mediated transport of CO2across the human erythrocyte membrane

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Abstract
Recent studies have suggested that aquaporin‐1 (AQP1) as well as the HCO3−‐Cl−transporter may be involved in CO2transport across biological membranes, but the physiological importance of this route of gas transport remained unknown. We studied CO2transport 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 CO2gradient and generated a rapid biphasic intracellular acidification. The gradient of the acidifying gas was kept small to favour high affinity entry of CO2passing 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 HgCl2at 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 CO2transport across the red cell membrane is mediated by AQP1 and the HCO3−‐Cl−transporter. Therefore, these proteins may function as high affinity sites for CO2transport across the erythrocyte membrane.