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Is there a causal association between genotoxicity and the imposex effect?
- Source :
-
Environmental health perspectives [Environ Health Perspect] 2006 Apr; Vol. 114 Suppl 1, pp. 20-6. - Publication Year :
- 2006
-
Abstract
- There is a growing body of evidence that indicates common environmental pollutants are capable of disrupting reproductive and developmental processes by interfering with the actions of endogenous hormones. Many reports of endocrine disruption describe changes in the normal development of organs and tissues that are consistent with genetic damage, and recent studies confirm that many chemicals classified to have hormone-modulating effects also possess carcinogenic and mutagenic potential. To date, however, there have been no conclusive examples linking genetic damage with perturbation of endocrine function and adverse effects in vivo. Here, we provide the first evidence of DNA damage associated with the development of imposex (the masculinization of female gastropods considered to be the result of alterations to endocrine-mediated pathways) in the dog-whelk Nucella lapillus. Animals (n = 257) that displayed various stages of tributyltin (TBT) -induced imposex were collected from sites in southwest England, and their imposex status was determined by physical examination. Linear regression analysis revealed a very strong relationship (correlation coefficient of 0.935, p < 0.0001) between the degree of imposex and the extent of DNA damage (micronucleus formation) in hemocytes. Moreover, histological examination of a larger number of dog-whelks collected from sites throughout Europe confirmed the presence of hyperplastic growths, primarily on the vas deferens and penis in both TBT-exposed male snails and in females that exhibited imposex. A strong association was found between TBT body burden and the prevalence of abnormal growths, thereby providing compelling evidence to support the hypothesis that environmental chemicals that affect reproductive processes do so partly through DNA damage pathways.
- Subjects :
- Animals
Body Burden
Cohort Studies
Disorders of Sex Development chemically induced
Disorders of Sex Development epidemiology
Disorders of Sex Development etiology
England
Female
Gonads cytology
Gonads growth & development
Hyperplasia chemically induced
Hyperplasia epidemiology
Male
Sexual Development drug effects
Snails anatomy & histology
Snails drug effects
Statistics as Topic
Trialkyltin Compounds pharmacokinetics
Trialkyltin Compounds toxicity
DNA Damage drug effects
Environmental Pollutants toxicity
Gonads abnormalities
Gonads drug effects
Subjects
Details
- Language :
- English
- ISSN :
- 0091-6765
- Volume :
- 114 Suppl 1
- Database :
- MEDLINE
- Journal :
- Environmental health perspectives
- Publication Type :
- Academic Journal
- Accession number :
- 16818242
- Full Text :
- https://doi.org/10.1289/ehp.8048