The teleost fish intestine is a major oxalate-secreting epithelium

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Oxalate is a common constituent of kidney stones, but the mechanism of its transport across epithelia is not well understood. With prior research on the role of the intestine focused on mammals, the present study considered oxalate handling by teleost fish. Given the osmotic challenge of seawater (SW), marine teleosts have limited scope for urinary oxalate excretion relative to freshwater (FW) taxa. The marine teleost intestine was hypothesized as the principal route for oxalate elimination, thus demanding epithelial secretion. To test this, intestinal 14C-oxalate flux was compared between FW- and SW-acclimated sailfin molly (Poecilia latipinna). In SW, oxalate was secreted at remarkable rates (367.90±22.95 pmol cm-2 h-1), which were similar following FW transfer (387.59±27.82 pmol cm-2 h-1), implying no regulation by salinity. Nevertheless, this ability to secrete oxalate at rates 15-19 times higher than the mammalian small intestine supports this proposal of the teleost gut as a major, previously unrecognized excretory pathway.

Original languageEnglish (US)
Article numberjeb216895
JournalJournal of Experimental Biology
Issue number12
StatePublished - Jun 2020
Externally publishedYes


  • Anion exchange
  • Bicarbonate secretion
  • Calcium carbonate
  • DIDS
  • Slc26
  • Ussing chamber

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Aquatic Science
  • Animal Science and Zoology
  • Molecular Biology
  • Insect Science


Dive into the research topics of 'The teleost fish intestine is a major oxalate-secreting epithelium'. Together they form a unique fingerprint.

Cite this