Effects of inorganic lead in vitro on ion exchanges and respiratory metabolism of rat kidney cortex.
The effects of Pb2+ added in vitro to tissue slices, isolated tubules and isolated mitochondria of rat kidney cortex have been studied. Slices were depleted of K+ and loaded with Na+, Cl- and water by pre-incubation at 1 degree C, and reversal of these changes was then induced by incubation under metabolically favourable conditions. The net reaccumulation of K+ was reduced by a maximum of 30% when Pb2+ was present in the medium, the maximal effect being caused by 200 microM Pb2+. Lead also caused a reduction of Na+ extrusion which was approximately equimolar with its effect on K+, but it did not affect the extrusion of Cl- and water. The initial rates of the net, active movements of K+ and Na+ were not altered by Pb2+, divergence from control values only being noted after 15-30 min incubation. The O2 consumption and the ATP content were 25-30% lower in slices incubated with 200 microM Pb2+ than in control slices; the effect on ATP content was not observed until incubation had continued for 30 min. In tubules isolated from the renal cortex, the rate of respiration (50%) and ATP content (30%) were also partly reduced by 200 microM Pb2+. The consumption of O2 by mitochondria isolated from the cortex was much more sensitive to Pb2+ added in vitro than the respiration of intact cells; the rate of respiration in state 3 (presence of phosphate acceptor) and the respiratory control ratio were drastically reduced, with half-maximal inhibition at 30 and 20 microM Pb2+ respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D000968:Antimycin A / Q000494:pharmacology; D004734:Energy Metabolism / Q000187:drug effects; D066298:In Vitro Techniques; D007474:Ion Exchange; D007672:Kidney Cortex / Q000187:drug effects / Q000378:metabolism*; D007684:Kidney Tubules / Q000378:metabolism; D007854:Lead / Q000494:pharmacology*; D008297:Male; D008928:Mitochondria / Q000378:metabolism; D010042:Ouabain / Q000494:pharmacology; D010101:Oxygen Consumption / Q000187:drug effects*; D051381:Rats
D007854:Lead; D010042:Ouabain; D000968:Antimycin A; D000255:Adenosine Triphosphate