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National Institute of Environmental Health Sciences

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Your Environment. Your Health.

Publication Detail

Title: Low-level arsenite causes accumulation of ubiquitinated proteins in rabbit renal cortical slices and HEK293 cells.

Authors: Kirkpatrick, D S; Dale, K V; Catania, J M; Gandolfi, A J

Published In Toxicol Appl Pharmacol, (2003 Jan 15)

Abstract: Arsenic is a known human carcinogen that affects a variety of processes within the cell. In this study, the effects of environmentally relevant As(III) exposures on the ubiquitin (Ub)-proteasome pathway have been investigated. Low-level As(III) exposure (0.5 - 10 microM) causes an accumulation of high-molecular-weight ubiquitin protein conjugates in both precision-cut rabbit renal-cortical slices and human embryonic kidney (HEK) 293 cells. The As(III) doses that induced these molecular changes were subcytotoxic in both model systems. Doses of 10 microM As(III) decreased cellular activity of the 20S proteasome by 40 and 15% in slices and HEK293 cells, respectively. As(III) did not cause any notable difference in Ub-conjugating activity of rabbit renal slices or HEK293 cells. Since ubiquitination plays such a vital role in maintaining cellular homeostasis, this noticeable perturbation of cellular ubiquitination is likely to have a multitude of signaling effects within the cells and may contribute to the pathogenesis of low-level arsenic.

PubMed ID: 12639501 Exiting the NIEHS site

MeSH Terms: Animals; Arsenites/toxicity*; Cells, Cultured; Cysteine Endopeptidases/drug effects; Cysteine Endopeptidases/metabolism; Dose-Response Relationship, Drug; Humans; Kidney Cortex/drug effects*; Kidney Cortex/metabolism; Multienzyme Complexes/drug effects; Multienzyme Complexes/metabolism; Proteasome Endopeptidase Complex; Proteins/metabolism*; Rabbits; Ubiquitin/metabolism*

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