Aquaporin-1 and HCO3--Cl- transporter-mediated transport of CO2 across the human erythrocyte membrane

Recent studies have suggested that aquaporin-1 (AQP1) as well as the HCO3--Cl- transporter may be involved in CO, transport across biological membranes, but the physiological importance of this route of gas transport remained unknown. We studied CO, transport in human red blood cell ghosts at physiological temperatures (37 degreesC). 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 muM) or the HCO3--Cl- transporter (by DIDS at 15 muM) 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.