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Pathways for organic osmolyte synthesis in rabbit renal papillary tissue, a metabolic study using 13C-labeled substrates

1988; Elsevier BV; Volume: 971; Issue: 2 Linguagem: Inglês

10.1016/s0005-2728(88)80102-6

1879-2650

A. W. H. Jans, R. Willi Grunewald, Rolf K. H. Kinne,

Ion Transport and Channel Regulation

Renal papillary collecting duct cells have been postulated to adapt their intracellular osmolality to the largechanges in interstitial osmolality by changing their content of ‘non-perturbing’ organic osmolytes such as sorbitol and myo-inositol. 13C-NMR was used in this study to elucidate the metabolic pathways leading to a synthesis of those compounds. Incubation of rabbit renal papillary tissue with [1-13C]glucose showed label scrambling mainly into sorbitol (C-1) and lactate (C-3). This result confirms activity of aldose reductase and glycolytic enzymes in renal papillary cells. Using [3-13C]alanine or [2-13C]pyruvate as carbon source, 13C-labeling of sorbitol and myo-inositol was observed, indicating that renal papillary tissue possesses, in addition, gluconeogenic activity. The latter assumption is supported by the result that in enzyme assays rabbit kidney papilla and isolated rat kidney papillary collecting duct cells show significant fructose-1,6-bis-phosphatase activity.