Efficient repair of 8-oxo-7,8-dihydrodeoxyguanosine in human and hamster xeroderma pigmentosum D cells.

Abstract:

:The repair of the endogenous lesion 8-oxo-7,8-dihydrodeoxyguanosine (8-oxodG) was investigated in the nucleotide excision repair mutant xeroderma pigmentosum D (XPD), using human normal or transformed XPD fibroblasts and the Chinese hamster XPD cell line UV5. In vivo repair of 8-oxodG induced by hydrogen peroxide treatment and analyzed by high-performance liquid chromatography/electrochemical detection was normal in the XPD mutant fibroblasts XP15PV and GM434, as compared to normal human fibroblasts GM970, GM5757, and GM6114. Similar results were obtained with the human SV40-transformed XPD mutant cell line GM8207 in comparison to the control cell line GM637. Repair of 8-oxodG was even slightly (2-3-fold) but reproducibly increased in Chinese hamster XPD mutant UV5 cells, as compared to parental AA8 cells. This unexpected effect was reversed by transfection in UV5 cells of a wild-type XPD cDNA and confirmed in in vitro experiments in which a plasmid substrate containing a single 8-oxoG was repaired by UV5 cell extracts. The data show that repair of 8-oxodG is normal in XPD cells, thus indicating that the neurological complications of XPD patients may not be linked to in vivo accumulation of this lesion.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Cappelli E,Degan P,Thompson LH,Frosina G

doi

10.1021/bi992610l

subject

Has Abstract

pub_date

2000-08-29 00:00:00

pages

10408-12

issue

34

eissn

0006-2960

issn

1520-4995

pii

bi992610l

journal_volume

39

pub_type

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