Intestinal phosphorus absorption: recent findings in translational and clinical research

Kathleen M. Hill Gallant, Colby J. Vorland

Research output: Contribution to journalArticlepeer-review


PURPOSE OF REVIEW: The purpose of this review is to discuss recent findings in intestinal phosphorus absorption pathways, particularly the contributions of paracellular versus transcellular absorption, and the differential findings from studies using in vitro versus in vivo techniques of assessing phosphorus absorption in experimental animal studies. RECENT FINDINGS: Experimental animal studies show that in vivo effects of low phosphorus diets, 1,25D, and chronic kidney disease on intestinal phosphorus absorption efficiency contradict effects previously established ex vivo/in vitro. Recent in vivo studies also suggest that the paracellular pathway accounts for the majority of phosphorus absorption in animals across very low to high luminal phosphate concentrations. The data from experimental animal studies correspond to recent human studies showing the effectiveness of targeted inhibition of paracellular phosphate absorption. Additionally, recent human studies have demonstrated that NaPi-2b inhibition alone does not appear to be effective in lowering serum phosphate levels in patients with chronic kidney disease. Pursuit of other transcellular phosphate transporter inhibitors may still hold promise. SUMMARY: In vivo animal and human studies have added to our understanding of intestinal phosphorus absorption pathways, regulation, and mechanisms. This is beneficial for developing effective new strategies for phosphate management in patients with chronic kidney disease.

Original languageEnglish (US)
Pages (from-to)404-410
Number of pages7
JournalCurrent opinion in nephrology and hypertension
Issue number4
StatePublished - Jul 1 2021

Bibliographical note

Publisher Copyright:
Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved.

PubMed: MeSH publication types

  • Journal Article
  • Research Support, N.I.H., Extramural


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