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Substrate utilization in the isolated perfused cortical thick ascending limb of rabbit nephron

  • Transport Processes, Metabolism and Endocrinology; Kidney, Gastrointestinal Tract, and Exocrine Glands
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Abstract

Isolated segments of cortical thick ascending limbs (cTAL) of rabbit kidney were perfused in vitro and the equivalent short circuit current (Isc) was measured. In a first series all substrates were removed on either side. Isc fell rapidly to 50±12% after 3 min and to 27±6% (n=5) after 10 min. This indicates that in cTAL segments Isc is strictly dependent on the presence of substrates. In series two it was tested what substrates can be utilized by the cTAL segment, and from which epithelial side [bath (b) or lumen (l)] the substrates are taken up. From the l-side only butyrate (10 mmol · l−1) sustained the Isc at 95±2% (n=7). All other tested substrates (10 mmol · l−1): pyruvate, acetate, β-OH-butyrate,d-glucose, andl-lactate lead to a marked decline in Isc. From the b-side several substrates (5–10 mmol · l−1) sustained the Isc:d-glucose,d-mannose, butyrate, β-OH-butyrate, acetoacetate,l-lactate, acetate and pyruvate. Other compounds (1–10 mmol · l−1): citrate, α-ketoglutarate, succinate, glutamate, glutamine, propionate, caprylate and oleate did not sustain Isc. In the third series the mechanism of substrate utilization from the basolateral cell side was studied. It was shown that the Isc is a saturable function of thed-glucose,l-lactate, acetate, pyruvate or β-OH-butyrate concentration with apparentK m's between 0.05–1.0 mmol · l−1. Several known inhibitors of sugar and of anion transport were tested at the bath side: phlorrhizin was without effect. Phloretin (500 μmol · l−1) inhibited Isc by 96%, yet its effect was not dependent on the presence of substrates on the b-side since inhibition ocurred also if the b-perfusate contained no substrate and Isc was driven by luminal butyrate. Also SITS (5 mmol · l−1) exerted only a small inhibitory effect which was not specific since it was also observed with luminal butyrate. α-Cyano-m-OH-cinnamate (10 mmol · l−1) inhibited the Isc specifically whenl-lactate was the bath substrate. Probenecid (1 mmol · l−1) had a similar yet less marked inhibitory effect. Thed-glucose uptake from the b-side was specifically inhibited by cytochalasin B at 5 · 10−6 mol · l−1. We conclude that the cTAL segment of the rabbit utilizesd-glucose and/or small anions such as pyruvate orl-lactate or acetate to energize salt reabsorption. The link between substrate availability and salt reabsorption is extremely close in this nephron segment. Substrate uptake occurs from the blood side. Sugar uptake can be inhibited by cytochalasin B andl-lactate uptake by probenecid and α-cyano-m-OH-cinnamat. These data suggest that substrate uptake at the basolateral cell side occurs probably via carrier systems.

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Wittner, M., Weidtke, C., Schlatter, E. et al. Substrate utilization in the isolated perfused cortical thick ascending limb of rabbit nephron. Pflugers Arch. 402, 52–62 (1984). https://doi.org/10.1007/BF00584832

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