Toxicity of short-chain alcohols to the nematode Caenorhabditis elegans: a comparison of endpoints.

Abstract:

:The toxicities of 4 short-chain alcohols--namely methanol, ethanol, iso-propanol and iso-butanol--were compared in the nematode Caenorhabditis elegans using several different ecotoxicological endpoints. Range-finding tests were conducted using transgenic PC161 worms carrying a double reporter construct (GFP plus lacZ) linked to the stress-inducible hsp16-1 promoter. These tests showed little response from the GFP reporter, but gave good dose-response curves for the lacZ reporter--showing clear induction at 0.5% v/v ethanol in an overnight assay, but only at 4% in a shorter 6-h assay. Comparison of the short-term dose-response curves shows a confusing pattern of differences between the four alcohols tested, although dose-dependence is evident across at least part of the concentration range. Feeding inhibition assays are somewhat inconclusive with regard to alcohol type, although iso-butanol and iso-propanol appear more toxic than ethanol, while methanol is least toxic. To resolve some of the remaining ambiguities, we also used a fecundity assay to show that iso-propanol is more toxic than ethanol, and a lethality assay to show that iso-butanol is more toxic than iso-propanol. Most of the endpoints studied are consistent with the following order of toxicity: iso-butanol > iso-propanol > ethanol > or = methanol.

journal_name

J Biochem Mol Toxicol

authors

Thompson G,de Pomerai DI

doi

10.1002/jbt.20060

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

87-95

issue

2

eissn

1095-6670

issn

1099-0461

journal_volume

19

pub_type

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