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Chemotherapy-induced Vascular Toxicity - Real-time In vivo Imaging of Vessel Impairment
Published on: January 7, 2015
Indoxyl sulfate is a nephro-vascular toxin
1Department of Advanced Medicine for Uremia, Nagoya University Graduate School of Medicine, Nagoya, Japan. tniwa@med.nagoya-u.ac.jp
Summary
Indoxyl sulfate, a toxin accumulating in chronic kidney disease (CKD), drives disease progression. AST-120, an oral sorbent, reduces indoxyl sulfate levels, potentially slowing CKD and cardiovascular disease progression.
Area of Science:
- Nephrology
- Toxicology
- Cardiovascular Medicine
Background:
- Indoxyl sulfate accumulates in chronic kidney disease (CKD) patients.
- It is a protein metabolite contributing to CKD progression.
- Indoxyl sulfate is linked to cardiovascular disease in CKD patients.
Purpose of the Study:
- To investigate the role of indoxyl sulfate in CKD and cardiovascular disease progression.
- To evaluate the efficacy of AST-120 in reducing indoxyl sulfate levels.
- To explore the mechanisms by which indoxyl sulfate causes cellular damage.
Main Methods:
- Studied indoxyl sulfate accumulation in CKD patients.
- Investigated AST-120's adsorption of indole, a precursor.
- Examined cellular uptake via organic anion transporters (OAT1/OAT3).
- Assessed free radical production via NADPH oxidase (Nox4).
- Analyzed effects on renal and vascular cells in rats.
Main Results:
- Indoxyl sulfate induces oxidative stress and cellular damage in renal and vascular cells.
- It promotes CKD progression by increasing specific protein expressions.
- Indoxyl sulfate stimulates vascular smooth muscle cell proliferation and osteoblastic transdifferentiation.
- It promotes aortic calcification and thickening in hypertensive rats.
Conclusions:
- Indoxyl sulfate acts as a nephro-vascular toxin.
- It contributes to the progression of both CKD and cardiovascular disease.
- AST-120 may mitigate CKD and cardiovascular disease progression by reducing indoxyl sulfate.
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