Induction of enteric oxalate secretion by Oxalobacter formigenes in mice does not require the presence of either apical oxalate transport proteins Slc26A3 or Slc26A6

  • Marguerite HatchEmail author
Original Paper


Oxalobacter sp. promotion of enteric oxalate excretion, correlating with reductions in urinary oxalate excretion, was previously reported in rats and mice, but the mechanistic basis for this affect has not been described. The main objective of the present study was to determine whether the apical oxalate transport proteins, PAT1 (slc26a6) and DRA (slc26a3), are involved in mediating the Oxalobacter-induced net secretory flux across colonized mouse cecum and distal colon. We measured unidirectional and net fluxes of oxalate across tissues removed from colonized PAT1 and DRA knockout (KO) mice and also across two double knockout (dKO) mouse models with primary hyperoxaluria, type 1 (i.e., deficient in alanine-glyoxylate aminotransferase; AGT KO), including PAT1/AGT dKO and DRA/AGT dKO mice compared to non-colonized mice. In addition, urinary oxalate excretion was measured before and after the colonization procedure. The results demonstrate that Oxalobacter can induce enteric oxalate excretion in the absence of either apical oxalate transporter and urinary oxalate excretion was reduced in all colonized genotypes fed a 1.5% oxalate-supplemented diet. We conclude that there are other, as yet unidentified, oxalate transporters involved in mediating the directional changes in oxalate transport across the Oxalobacter-colonized mouse large intestine.


PAT-1 DRA AGT Cecum Distal colon Urinary oxalate 



The authors thank Shreya Mishra, Heran Getachew, and Tisha Van Pelt for excellent technical assistance and animal husbandry.

Author contributions

MH is responsible for conception and design of the research and MH performed the flux experiments. MH analyzed the data and interpreted the results and MH drafted the manuscript.


This work was supported by NIH Grant Nos. DK088892 and DK081624 in addition to a Grant from the Oxalosis and Hyperoxaluria Foundation.

Compliance with ethical standards

Conflict of interest

The author declares no conflict of interest.

Ethical approval

All procedures performed in studies involving animals were in accordance with the ethical standards of the institution at which the studies were conducted. This article does not contain any studies with human participants performed by the author.

Supplementary material

240_2019_1144_MOESM1_ESM.pdf (140 kb)
Supplementary material 1 (PDF 139 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Pathology, Immunology and Laboratory Medicine, College of MedicineUniversity of FloridaGainesvilleUSA

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