Linked Life Data

20045014

Source:http://linkedlifedata.com/resource/pubmed/id/20045014

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2010-3-29
pubmed:abstractText
Based on epidemiological data, chronic exposure to high levels of inorganic arsenic in drinking water is carcinogenic to humans, inducing skin, urinary bladder and lung tumors. In vivo, inorganic arsenic is metabolized to organic methylated arsenicals including the highly toxic dimethylarsinous acid (DMA(III)) and monomethylarsonous acid (MMA(III)). Short-term treatment of rats with 100 microg/g trivalent arsenic (As(III)) as sodium arsenite in the diet or in drinking water induced cytotoxicity and necrosis of the urothelial superficial layer, with increased cell proliferation and hyperplasia. The objectives of this study were to determine if these arsenic-induced urothelial effects are dose responsive, the dose of arsenic at which urothelial effects are not detected, and the urinary concentrations of the arsenical metabolites. We treated female F344 rats for 5 weeks with sodium arsenite at dietary doses of 0, 1, 10, 25, 50, and 100 ppm. Cytotoxicity, cell proliferation and hyperplasia of urothelial superficial cells were increased in a dose-responsive manner, with maximum effects found at 50 ppm As(III). There were no effects at 1 ppm As(III). The main urinary arsenical in As(III)-treated rats was the organic arsenical dimethylarsinic acid (DMA(V)). The thio-metabolites dimethylmonothioarsinic acid (DMMTA(V)) and monomethylmonothioarsinic acid (MMMTA(V)) were also found in the urine of As(III)-treated rats. The LC(50) concentrations of DMMTA(V) for rat and human urothelial cells in vitro were similar to trivalent oxygen-containing arsenicals. These data suggest that dietary As(III)-induced urothelial cytotoxicity and proliferation are dose responsive, and the urothelial effects have a threshold corresponding to the urinary excretion of measurable reactive metabolites.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1096-0333
pubmed:author
pubmed:copyrightInfo
Copyright 2009 Elsevier Inc. All rights reserved.
pubmed:issnType
Electronic
pubmed:day
15
pubmed:volume
244
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
99-105
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Dietary administration of sodium arsenite to rats: relations between dose and urinary concentrations of methylated and thio-metabolites and effects on the rat urinary bladder epithelium.
pubmed:affiliation
Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198-3135, USA.
pubmed:publicationType
Journal Article, Comparative Study