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Aerobic and anaerobic metabolism of bovine ciliary process: effects of metabolic and transport inhibitors.

In the present study we have measured the oxygen consumption and lactic acid production, under aerobic and anaerobic conditions, in the bovine ciliary process epithelium (CPE) in the presence and absence of transport modifiers. Basal oxygen consumption was 8-15 microliters O2 consumed/mg protein/hr and decreased by 35% when sodium was removed or ouabain was added to the media. Anaerobic metabolism as measured by lactate production was also attenuated by sodium-free or ouabain treatment. When O2 consumption was severely limited by cyanide, lactic acid production increased significantly ("Pasteur effect"), whereas 2-deoxyglucose reduced lactate formation. Both chloride-free and acetazolamide treated CPE increased their dependency on aerobic glycolysis, and this response was also observed under anaerobic conditions, suggesting the presence of an anion transport mechanism. A net lactate production was also found to occur across the aqueous epithelium under aerobic and anaerobic conditions. These results are consistent with the presence of a bicarbonate-sensitive anion transport system located in the ciliary process epithelium.