Nucleic Acids Research, Vol 25, Issue 3 480-491, Copyright © 1997 by Oxford University Press
JG Moggs, DE Szymkowski, M Yamada, P Karran and RD Wood
In order to understand the action of the chemotherapeutic drug cisplatin,
it is necessary to determine why some types of cisplatin-DNA intrastrand
crosslinks are repaired better than others. Using cell extracts and
circular duplex DNA, we compared nucleotide excision repair of uniquely
placed 1,2-GG, 1,2-AG, and 1,3-GTG cisplatin- crosslinks, and a
2-acetylaminofluorene lesion. The 1,3 crosslink and the acetylaminofluorene
lesion were repaired by normal cell extracts approximately 15-20 fold
better than the 1,2 crosslinks. No evidence was found for selective
shielding of 1,2 cisplatin crosslinks from repair by cellular proteins.
Fractionation of cell extracts to remove putative shielding proteins did
not improve repair of the 1,2-GG crosslink, and cell extracts did not
selectively inhibit access of UvrABC incision nuclease to 1,2-GG
crosslinks. The poorer repair of 1,2 crosslinks in comparison to the 1,3
crosslink is more likely a consequence of different structural alterations
of the DNA helix. In support of this, a 1,2-GG-cisplatin crosslink was much
better repaired when it was opposite one or two non-complementary thymines.
Extracts from cells defective in the hMutSalpha mismatch binding activity
also showed preferential repair of the 1,3 crosslink over the 1,2
crosslink, and increased repair of the 1,2 adduct when opposite thymines,
showing that hMutSalphais not involved in the differential NER of these
substrates in vitro. Mismatched cisplatin adducts could arise by
translesion DNA synthesis, and improved repair of such adducts could
promote cisplatin-induced mutagenesis in some cases.
ARTICLES
Differential human nucleotide excision repair of paired and mispaired cisplatin-DNA adducts
Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Hertfordshire EN6 3LD, UK.
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