Linked Life Data

10737954

Source:http://linkedlifedata.com/resource/pubmed/id/10737954

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2000-4-27
pubmed:abstractText
The chromosome aberration assay in vitro is a useful and sensitive test for detection of genotoxins. However, aberrations can occur secondary to toxicity, with compounds that do not react with DNA and are not genotoxic in vivo. Thus, some positive results in the in vitro aberration assay are not relevant to human risk. To help evaluate the influence of toxicity, data were collected from 27 pharmaceutical and chemical companies and contract laboratories. When cytotoxicity was measured by cell counts or confluence, compounds expected to damage DNA (Category 1) generally induced aberrations without severe concomitant cytotoxicity, i.e., at cell growth 60% or more of control. The more toxic nucleoside analogues, topoisomerase inhibitors, fluoroquinolone antibiotics, antifolates, and producers of reactive oxygen were still positive with cell growth 50% or more of control. In contrast, when there was evidence that the compounds were not DNA damaging (Category 2), there was a higher proportion of toxicity-associated clastogens, with positive results at less than 50% of control cell growth. When mitotic index (MI) was used as an indicator of cytotoxicity, the pattern was less clear, although there was a tendency to more mitotic suppression with the Category 2 compounds. Overall the data indicate that a limit on toxicity, and a more accurate way of estimating it, would increase the accuracy of the assay by reducing the frequency of nonrelevant positive results with a threshold-type of dose relation. The rationale for evaluating positive results in the in vitro aberration assay, especially those associated with toxicity, is discussed, as is the need for a harmonized regulatory approach.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:issn
0893-6692
pubmed:author
pubmed:copyrightInfo
Copyright 2000 Wiley-Liss, Inc.
pubmed:issnType
Print
pubmed:volume
35
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
191-201
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Cytotoxicity and chromosome aberrations in vitro: experience in industry and the case for an upper limit on toxicity in the aberration assay.
pubmed:affiliation
Merck Research Laboratories, West Point, Pennsylvania 19486, USA. sheila_galloway@merck.com
pubmed:publicationType
Journal Article