Oxidative Stress, Mutations and Chromosomal Aberrations Induced by In Vitro and In Vivo Exposure to Furan

Area of Science:

• Toxicology
• Genetics
• Food Chemistry

Background:

• Furan is a food processing volatile compound.
• It is a possible human carcinogen, but its genotoxicity and carcinogenic mechanism are unclear.
• Previous studies on furan genotoxicity yielded inconsistent results.

Purpose of the Study:

• To investigate the mutagenic and clastogenic activity of furan and its metabolite cis-2 butene-1,4-dial (BDA).
• To identify the DNA lesions responsible for furan's genotoxic effects.
• To clarify the carcinogenic mode of action of furan.

Main Methods:

• Assessing mutagenic and clastogenic activity in mammalian cells and mouse models.
• Utilizing Fanconi anemia-derived human cell lines deficient in DNA inter-strand crosslink (ICL) repair.
• Employing Ogg1^-/- mice deficient in 8-hydroxyguanine DNA repair.

Main Results:

• Furan and BDA showed weak mutagenic activity but were potent inducers of clastogenic damage.
• DNA inter-strand crosslinks (ICLs) were strongly implicated as the primary lesions causing chromosomal damage.
• Oxidized base lesions were unlikely to play a significant role in furan-induced genotoxicity.

Conclusions:

• Furan and BDA induce chromosomal damage primarily through DNA inter-strand crosslinks (ICLs).
• The genotoxic effects of furan are mainly clastogenic rather than mutagenic.
• ICLs are key DNA lesions in the carcinogenic mechanism of furan.