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Baumgartner, A. ; Schmid, T.E. ; Schuetz, C.G.* ; Adler, I.-D.

Detection of aneuploidy in rodent and human sperm by multicolor FISH after chronic exposure to diazepam.

Mutat. Res. - Gen. Tox. Environ. Mutag. 490, 11-19 (2001)
Open Access Green as soon as Postprint is submitted to ZB.
Aneuploidy induction in male germ cells of mice and men after chronic exposure to diazepam (DZ: CAS 439-14-5; Valium(R)) was assessed by multicolor fluorescence in situ hybridization (FISH). DZ, a widely administered sedative and muscle relaxant, was proposed to act as an aneugen by disturbing spindle function in various assay systems. Male mice were treated by oral intubation with 3 mg/kg DZ once or daily for 14 consecutive days. At 22 days after the last treatment, epididymal sperm were collected from the caudae epididymes. Evaluation of aneuploid and diploid sperm (10,000 sperm per animal) was performed by multicolor FISH employing DNA probes specific for chromosomes X, Y, and 8 simultaneously. We found a significant increase in the frequency of disomy 8 in subchronically DZ-treated mice when compared to the concurrent solvent control group (2.4-fold; P < 0.01), while no increase was detected for sex-chromosome hyperhaploidies. No effect was seen when mice were treated with a single dose (3 mg/kg DZ). In a parallel human approach, two men were evaluated who chronically ingested >0.3 mg/kg/d DZ for more than 6 months. Multicolor FISH was applied to human sperm probing for chromosomes X, Y, and 13. Frequencies for sperm with disomy 13, disomy X, and total sex-chromosomal disomies were found to be elevated among the two subjects after chronic DZ-exposure compared to control subjects. In conclusion, the results indicate that diazepam acts as an aneugen during meiosis in male spermatogenesis, both in mice and humans. The quantitative comparison indicates that humans may be at least 10 times more sensitive than mice for aneuploidy induction by DZ during male meiosis.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords diazepam; aneuploidy; sperm; FISH; human; mice
ISSN (print) / ISBN 1383-5718
e-ISSN 1388-2120
Journal Mutation Research / Genetic Toxicology and Environmental Mutagenesis
Quellenangaben Volume: 490, Issue: , Pages: 11-19 Article Number: , Supplement: ,
Publisher Elsevier
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Experimental Genetics (IEG)