Document Detail

Protective effect of urate oxidase on uric acid induced-monocyte apoptosis.
MedLine Citation:
PMID:  16472239     Owner:  NLM     Status:  MEDLINE    
Uremic patients have a higher risk of infection and malignancy than normal subjects. Previous studies have deomonstrated that monocytes isolated from uremic patients display an increased apoptosis rate compared to normal subjects; furthermore uremic plasma can increase apoptosis rates on U937, a human monocytic cell line. In several pathological conditions, precipitation of uric acid crystals can lead to renal insufficiency or acute renal failure by different mechanisms. In recent studies uric acid has been shown to induce inflammatory response from monocytes and it has been suggested to be involved in cell dysfunction. Rasburicase is a new recombinant urate oxidase developed to prevent and treat hyperuricaemia in patients with cancer or renal failure; it degrades uric acid to allantoin, a less toxic and more soluble product. In the present study, we aimed at determining whether uric acid may be a factor affecting U937 apoptosis, and whether urate oxidase may reduces or even prevent uric acid induced cell apoptosis. Hoechst staining and internucleosome ledder fragmentation of DNA showed that uric acid increased the percentage of apoptotic cells comparing to the control and that when the U937 cells were incubated with uric acid and urate oxidase the percentage of apoptosis significantly decreased (from 43+/-7% to 19+/- 3%, p<0.05). Also, the activity of caspase-8 and caspase-3 showed the same trend (caspase 3: from 2.7+/-0.53 to 1.6+/-0.42; caspase-8: from 2.2+/-0.43 to 1.3+/-0.57). A reduction of intracellular reduced glutathione (GSH) concentration was found in uric acid treated cells while the addition of urate oxidase in the uric acid incubated cells decreased the GSH extrusion. The concentration of TNF-alpha was increased in the sample incubated with uric acid comparing to the control. Uric acid is an inducer of apoptosis on U937 cell line, and therefore it may be a component of the mosaic of uremic toxins both in acute and chronic renal disease. We can hypothesize that uric acid might be directly involved in the apoptotic process trough the activation of both death receptor and mitochondrial-mediated pathways. We have, also, demonstrated that urate oxidase is able to prevent at least in part, the effect of uric acid on U937 apoptosis. This effect might be a result of different mechanisms of action.
Valeria Bordoni; Massimo De Cal; Mario Rassu; Stefania Cazzavillan; Chiara Segala; Monica Bonello; Rattanarat Ranishta; Emilios Andrikos; Asuman Yavuz; Gabriella Salvatori; Elisabetta Galloni; Irene Bolgan; Rinaldo Bellomo; Nathan Levin; Claudio Ronco
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Current drug discovery technologies     Volume:  2     ISSN:  1570-1638     ISO Abbreviation:  Curr Drug Discov Technol     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2006-02-13     Completed Date:  2006-03-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101157212     Medline TA:  Curr Drug Discov Technol     Country:  United Arab Emirates    
Other Details:
Languages:  eng     Pagination:  29-36     Citation Subset:  IM    
Department of Nephrology, San Bortolo Hospital, Vicenza, Italy.
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MeSH Terms
Apoptosis / drug effects*
Caspase 3
Caspase 8
Caspases / physiology
Glutathione / metabolism
Monocytes / cytology,  drug effects*
Recombinant Proteins / pharmacology
Tumor Necrosis Factor-alpha / biosynthesis
U937 Cells
Urate Oxidase / pharmacology*
Uric Acid / toxicity*
Reg. No./Substance:
0/Recombinant Proteins; 0/Tumor Necrosis Factor-alpha; 69-93-2/Uric Acid; 70-18-8/Glutathione; EC Oxidase; EC; EC 3.4.22.-/CASP3 protein, human; EC 3.4.22.-/CASP8 protein, human; EC 3.4.22.-/Caspase 3; EC 3.4.22.-/Caspase 8; EC 3.4.22.-/Caspases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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