Mth1 deficiency provides longer survival upon intraperitoneal crocidolite injection in female mice.

Abstract:

:Exposure to asbestos fiber is central to mesothelial carcinogenesis. Recent sequencing studies on human and rodent malignant mesothelioma (MM) revealed frequently mutated genes, including CDKN2A, BAP1 and NF2. Crocidolite directly or indirectly catalyses the generation of hydroxyl radicals, which appears to be the major driving force for mesothelial mutations. DNA base modification is an oxidative DNA damage mechanism, where 8-hydroxy-2'-deoxyguanosine (8-OHdG) is the most abundant modification both physiologically and pathologically. Multiple distinct mechanisms work together to decrease the genomic level of 8-OHdG through the enzymatic activities of Mutyh, Ogg1 and Mth1. Knockout of one or multiple enzymes is not lethal but increases the incidence of tumors. Here, we used single knockout (KO) mice to test whether the deficiency of these three genes affects the incidence and prognosis of asbestos-induced MM. Intraperitoneal injection of 3 mg crocidolite induced MM at a fraction of 14.8% (4/27) in Mth1 KO, 41.4% (12/29) in Mutyh KO and 24.0% (6/25) in Ogg1 KO mice, whereas 31.7% (20/63) induction was observed in C57BL/6 wild-type (Wt) mice. The lifespan of female Mth1 KO mice was longer than that of female Wt mice (p = 0.0468). Whole genome scanning of MM with array-based comparative genomic hybridization revealed rare genomic alterations compared to MM in rats and humans. These results indicate that neither Mutyh deficiency nor Ogg1 deficiency promotes crocidolite-induced MM in mice, but the sanitizing nucleotide pool with Mth1 is advantageous in crocidolite-induced mesothelial carcinogenesis.

journal_name

Free Radic Res

journal_title

Free radical research

authors

Funahashi S,Okazaki Y,Akatsuka S,Takahashi T,Sakumi K,Nakabeppu Y,Toyokuni S

doi

10.1080/10715762.2020.1743285

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

195-205

issue

2-3

eissn

1071-5762

issn

1029-2470

journal_volume

54

pub_type

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