Document Detail

Chronic progressive nephropathy in male f344 rats in 90-day toxicity studies: its occurrence and association with renal tubule tumors in subsequent 2-year bioassays.
MedLine Citation:
PMID:  21422264     Owner:  NLM     Status:  In-Data-Review    
The occurrence and severity of spontaneous chronic progressive nephropathy (CPN) in control male F344 rats as well as the frequency of treatment-related CPN exacerbation were histopathologically reevaluated. A series of 43 National Toxicology Program (NTP) 90-day toxicity studies comparing the influence of NIH-07 or NTP-2000 diets was examined. Relationships between the histopathologic findings at 90 days and renal tubule proliferative lesions recorded in subsequent 2-year bioassays for 24 chemicals were statistically analyzed. CPN lesions were observed in 100% of the control male rats regardless of diet, but CPN was more severe in control rats fed NIH-07. Approximately one-third of the 90-day studies demonstrated a treatment-related exacerbation of CPN severity, which was independent of diet. For chemicals that proceeded to 2-year bioassays, all studies with a statistically significant increase in renal tubule tumors (RTT) at 2 years had treatment-related exacerbation of CPN in the 90-day and 2-year studies. These findings indicate that CPN occurs ubiquitously in young male F344 rats and that treatment-related exacerbation of CPN in 90-day studies is a relatively common occurrence, having the potential to be predictive of an increased incidence of RTT in subsequent 2-year bioassays.
Greg S Travlos; Gordon C Hard; Laura J Betz; Grace E Kissling
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Toxicologic pathology     Volume:  39     ISSN:  1533-1601     ISO Abbreviation:  Toxicol Pathol     Publication Date:  2011  
Date Detail:
Created Date:  2011-03-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7905907     Medline TA:  Toxicol Pathol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  381-9     Citation Subset:  IM    
1National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina, USA.
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