Lactate production in isolated segments of the rat nephron

S. Bagnasco, D. Good, R. Balaban, M. Burg

Research output: Contribution to journalArticle

118 Scopus citations

Abstract

Lactate production was measured directly in individual segments of the rat nephron. Tubules were dissected and then incubated in vitro with glucose as the only metabolic substrate. Each segment was incubated with and without antimycin A, an inhibitor of oxidative metabolism. Proximal tubules produced no lactate with or without antimycin A. The distal segments all produced lactate. The rate of lactate production without antimycin A ranged from 0.4 to 0.9 pmol·min-1 in all distal segments except one, the inner medullary collecting duct, which produced lactate at the significantly higher rate of 2.8 pmol·min-1·mm-1. Antimycin A increased lactate production significantly in all of the distal segments. The increase was largest in medullary thick ascending limbs (1,400%) and cortical (798%) and outer medullary collecting ducts (357%). Increments were smaller in cortical thick ascending limbs (98%) and distal convoluted tubules (98%) and least in the inner medullary collecting ducts (28%). We conclude that lactate production occurs only in distal segments of the nephron and that under anoxic conditions significant amounts of ATP are produced by anaerobic glycolysis in these segments.

Original languageEnglish (US)
Pages (from-to)F522-F526
JournalAmerican Journal of Physiology - Renal Fluid and Electrolyte Physiology
Volume17
Issue number4
StatePublished - Jan 1 1985
Externally publishedYes

ASJC Scopus subject areas

  • Physiology

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