Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
5343805
Reference Type
Journal Article
Title
Histopathology re-examination of the NTP toxicity/carcinogenicity studies of tert-butyl alcohol to identify renal tumor and toxicity modes of action
Author(s)
Hard, GC; Cohen, SM; Ma, J; Yu, F; Arnold, LL; Banton, MI
Year
2019
Is Peer Reviewed?
1
Journal
Regulatory Toxicology and Pharmacology
ISSN:
0273-2300
EISSN:
1096-0295
Volume
102
Page Numbers
65-73
Language
English
PMID
30590081
DOI
10.1016/j.yrtph.2018.12.011
Web of Science Id
WOS:000463848300009
Abstract
Tert-butyl alcohol (TBA) targets the rat kidney following repeated exposures, including renal tubule tumors. The mode of action (MOA) of these tumors, concluded by a pathology working group, involves both alpha2u-globulin nephropathy (α2u-gN) and exacerbated chronic progressive nephropathy (CPN), but has been disputed and an undefined MOA proposed. This study further reviews the histology slides of male and female rat kidneys from the NTP drinking water 13-week toxicity and 2-year carcinogenicity studies, including the 15-month interim sacrifice group. The papillary epithelial lining alteration formerly referred to as "transitional cell hyperplasia" develops as part of advanced CPN and does not represent a separate toxicity. No changes were observed in the kidney pelvis urothelium. The only alterations in subchronic male rats involved α2u-gN and CPN, without test article-related alterations in females. Focused examination of areas of parenchyma unaffected by CPN in TBA-treated male and female rats of the chronic studies revealed no renal tubule abnormalities other than from the effects of α2u-gN and CPN. Unrelated to toxicity were spontaneous amphophilic or vacuolar tubule proliferative lesions. All observed TBA-associated non-neoplastic and neoplastic histopathological changes in the kidney can be explained by α2u-gN or enhanced CPN, neither of which are relevant to humans.
Keywords
ten-Butyl alcohol; alpha2u-globulin nephropathy; Chronic progressive nephropathy; Renal tubule tumors; Modes-of-action
Tags
IRIS
•
tert-Butanol
Supporting Studies
Sources of Mechanistic and Toxicokinetic Data
Other mechanistic studies
LitSearch: Jan 2017 - July 2019
WoS
PubMed
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity