[DNA methylation of monohalogenated methanes of F344 rats].
Monohalogenated methanes (methyl chloride, methyl bromide and methyl iodide) are mutagenic and carcinogenic. The possible mechanism of these effects, DNA methylation, was studied. DNA adducts from organs of F344 rats exposed to these chemicals were separated and identified with high performance liquid chromatography (HPLC) and gas-chromatography/mass-spectrometry (GC/MS). DNA adducts, 7-methylguanine (7-MeG) and O6-Methylguanine(0(6)-MeG), incorporation of 14C into de novo synthesis of nucleobases could be observed in enzymatic DNA hydrolysates by HPLC and determination of the radioactivity in the fractions. The formation of DNA adducts in the studied organs was only quantitatively different. The formation of O6-MeG was further proved by analysing the acidic hydrolysates using HPLC with non-radioactive O6-MeG as internal standard. 7-MeG and 3-MeA were identified with GC/MS analysis.
Xu
D G
DG
Institut für Arbeitsmedizin, Tongji Medizinische Universität, Wuhan.
He
H Z
HZ
Zhang
G G
GG
Gansewendt
B
B
Peter
H
H
Bolt
H M
HM
D000818:Animals; D002851:Chromatography, High Pressure Liquid; D004247:DNA / Q000187:drug effects* / Q000378:metabolism; D006147:Guanine / Q000031:analogs & derivatives / Q000378:metabolism; D006842:Hydrocarbons, Brominated / Q000633:toxicity*; D006847:Hydrocarbons, Iodinated / Q000633:toxicity*; D008297:Male; D008737:Methyl Chloride / Q000633:toxicity*; D008745:Methylation; D051381:Rats; D011916:Rats, Inbred F344
D006842:Hydrocarbons, Brominated; D006847:Hydrocarbons, Iodinated; D006147:Guanine; C008450:7-methylguanine; D004247:DNA; C008449:O-(6)-methylguanine; C005218:methyl bromide; D008737:Methyl Chloride; C014055:methyl iodide
DNA-Methylierung von monohalogenierten Methanen in F-344 Ratten.