RGD Reference Report - Oral sorbent AST-120 increases renal NO synthesis in uremic rats. - Rat Genome Database

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Oral sorbent AST-120 increases renal NO synthesis in uremic rats.

Authors: Tumur, Z  Niwa, T 
Citation: Tumur Z and Niwa T, J Ren Nutr. 2008 Jan;18(1):60-4.
RGD ID: 2292109
Pubmed: PMID:18089446   (View Abstract at PubMed)
DOI: DOI:10.1053/j.jrn.2007.10.013   (Journal Full-text)

OBJECTIVE: The urine level of nitric oxide (NO) metabolites, i.e., nitrates/nitrites (NOx), in chronic renal failure (CRF) is decreased because of reduced renal synthesis of NO. We determined whether the administration of an oral sorbent, AST-120, increases the urine level of NOx and the renal expression of nitric oxide synthase (NOS) isoforms in CRF rats. METHODS: Chronic renal failure rats were produced by 4/5 nephrectomy. Rats were randomized into two groups: CRF control rats, and AST-120-treated CRF rats. The AST-120 was administered to the rats at a dose of 4 g/kg with powder chow for 16 weeks, whereas powder chow alone was administered to control rats. The urine levels of NOx were measured by using a NOx colorimetric assay kit. The expression of endothelial NOS (eNOS), inducible NOS (iNOS), and neuronal NOS (nNOS) in the kidney was determined by immunohistochemistry. Serum and urine levels of indoxyl sulfate were determined by high-performance liquid chromatography. RESULTS: Urine levels of NOx and the expression of glomerular eNOS and tubulointerstitial nNOS were significantly decreased in CRF rats compared with normal rats. The administration of AST-120 to CRF rats significantly increased urine levels of NOx and the expression of glomerular eNOS and tubulointerstitial nNOS. The administration of AST-120 to CRF rats significantly decreased urine and serum levels of indoxyl sulfate. CONCLUSIONS: The oral sorbent AST-120 increases NO synthesis in the kidneys of uremic rats by increasing the renal expression of eNOS and nNOS, through alleviation of indoxyl sulfate overload on the kidney.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
end stage renal disease  ISONos3 (Rattus norvegicus)2292109; 2292109protein:decreased expression:glomerulusRGD 
end stage renal disease  IEP 2292109protein:decreased expression:glomerulusRGD 

Objects Annotated

Genes (Rattus norvegicus)
Nos3  (nitric oxide synthase 3)

Genes (Mus musculus)
Nos3  (nitric oxide synthase 3, endothelial cell)

Genes (Homo sapiens)
NOS3  (nitric oxide synthase 3)


Additional Information