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Potential role of endothelial carbonic anhydrase in dehydration of plasma bicarbonate.

Initial reports of localization of carbonic anhydrase to the pulmonary capillary endothelium suggested that this vascular enzyme could cat-alyze plasma bicarbonate dehydration (1-3). Later work indicated that the enzyme was carbonic anhydrase IV, distinct from erythrocytic enzymes but possessing similar high activity, and therefore physiological potential (4). However, computations of CO2 exchange attributed only 10% of CO2 excretion to plasma bicarbonate dehydration mediated by the endothelial enzyme (5, 6).