The regulation of renal ammoniagenesis in the rat by extracellular factors. III. Effects of various fuels on in vitro ammoniagenesis

Serena Maria Bagnasco, Di Anna Slemmer Gaydos, Alvaro Risquez, Harry G. Preuss

Research output: Contribution to journalArticlepeer-review

Abstract

The addition of many oxidizable substrates to the medium of incubating rat renal slices decreases ammoniagenesis from glutamine and glutamate. Interestingly, lactate and β-hydroxybutyrate depress ammoniagenesis less in renal slices from acidotic rats compared with normal-control rats. In this study, the effects of an expanded panel of substrates on ammoniagenesis in kidney slices from control and acidotic rats were followed to discern patterns of inhibition. In addition to lactate and β-hydroxybutyrate, acetate, pyruvate, and perhaps acetoacetate caused relatively less depression of ammoniagenesis in acidotic slices. Citrate, succinate, fumarate, octanoate, and α-ketoglutarate decreased ammoniagenesis to the same extent or more in acidotic slices compared with that in normal-control slices. Glycerol had little effect on ammoniagenesis under either condition. From the substrates tested, it can be generalized that those outside the TCA cycle (with exception of octanoate) depress ammoniagenesis less during acidosis, while those in the TCA cycle depress ammoniagenesis equally or even more during acidosis. We hypothesize from the pattern of our results that changes in renal intermediary metabolism at or before citrate formation occur during acidosis and are important regulatory mechanisms for ammoniagenesis.

Original languageEnglish (US)
Pages (from-to)900-905
Number of pages6
JournalMetabolism
Volume32
Issue number9
DOIs
StatePublished - Sep 1983
Externally publishedYes

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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