An energy-dependent, sodium-independent component of active p-aminohippurate transport in rabbit renal cortex.

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Abstract
The relation between the coupling of metabolic energy to renal p-aminohippurate (PAH) accumulation and Na+-K+ transport was studied in rabbit cortical slices. Cyanide (CN-), 2,4-dinitrophenol (DNP) and fluoride (F-) at low-medium concentrations, giving rise to a slight decline of tissue ATP concentration, caused a reduction of PAH accumulation without significantly affecting intracellular Na+ and K+ concentrations. Higher levels of the metabolic inhibitors resulted in considerable inhibition of active Na+-K+ transport. The rate of carrier-mediated PAH uptake was slow under anaerobic conditions, relative to that measured under aerobic conditions in Na+-depleted slices. In the latter case the maximal accumulation achieved was only 1.55 .+-. 0.16. Uptake rate of PAH under anaerobic conditions was not inhibited by the absence of Na+ or addition of metabolic inhibitors in the concentrations used under aerobic conditions. Although Na+ is required for the attainment of high accumulation ratios of PAH, oxidative metabolism stimulates PAH flux by a Na+-independent mechanism.

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