DNA damage and repair in tumour and non-tumour tissues of mice induced by nicotinamide.

Abstract:

:In vivo DNA damage and repair was induced by nicotinamide (NAM) in adenotype 12 virus-induced mouse sarcoma A12B3 and sarcoma F inoculated into CBA mice. DNA damage, NAM and NAD concentrations were measured after in vivo exposure to NAM, in tumours and spleens by alkaline elution and by HPLC analysis. Our results indicate that NAM between 100-1000 mg kg-1 causes a high level of in vivo DNA strand breaks in tumours and normal tissues in mice bearing the immunogenic sarcoma A12B3 but not in the non-immunogenic sarcoma F. The repair process was also delayed by the NAM treatment probably owing to inhibition of the DNA repair enzyme, poly(ADP-ribose)polymerase, as evidenced by accumulation of NAM and NAD. These data are consistent with NAM having a mechanism of action as a radiosensitiser at least in part by DNA repair inhibition. In addition, it should also be considered that high doses of NAM might cause considerable complications to normal tissue in tumour-bearing individuals.

journal_name

Br J Cancer

authors

Olsson AR,Sheng Y,Pero RW,Chaplin DJ,Horsman MR

doi

10.1038/bjc.1996.367

subject

Has Abstract

pub_date

1996-08-01 00:00:00

pages

368-73

issue

3

eissn

0007-0920

issn

1532-1827

journal_volume

74

pub_type

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