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The Evolving View of Uremic Toxicity
Bjorn Meijers1,2, Jerome Lowenstein3
1Nephrology and Transplantation Unit, University Hospitals Leuven, 30000 Leuven, Belgium.
Toxins
|April 21, 2022
Summary
Indoxyl sulfate, a protein-bound toxin, accumulates in kidney disease and accelerates renal damage. New findings suggest it acts as a systemic signaling molecule beyond the kidneys.
Area of Science:
- Nephrology
- Toxicology
- Biochemistry
Background:
- Indoxyl sulfate is a protein-bound solute that increases in kidney disease.
- Early research identified it as a renal toxin accelerating kidney damage.
- Recent studies reveal organic anion transporters in non-renal tissues.
Purpose of the Study:
- To re-evaluate the role of indoxyl sulfate in systemic signaling.
- To explore indoxyl sulfate's function beyond renal excretion.
Main Methods:
- Review of existing literature on indoxyl sulfate.
- Analysis of studies on protein-bound solutes in renal impairment.
- Examination of data on organic anion transporters in various tissues.
Main Results:
- Indoxyl sulfate concentration is elevated in patients with impaired glomerular filtration.
- Indoxyl sulfate accelerates renal damage in experimental models.
- Organic anion transporters are present in multiple non-renal tissues, suggesting broader roles.
Conclusions:
- Indoxyl sulfate is more than a renal toxin; it functions as a systemic signaling molecule.
- Its presence in non-renal tissues indicates a role in broader physiological processes.
- Further research is needed to understand the systemic signaling pathways involving indoxyl sulfate.
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