Abstract:
:Lipoplatin, currently under phase III evaluation, is a novel liposomal cisplatin formulation highly effective against cancers. Lipoplatin has eliminated or reduced the systemic toxicity frequently seen for cisplatin. The objective of the present study was to determine whether the cytotoxic effect of lipoplatin is dependent on the functional integrity of DNA mismatch repair (MMR), a post-replicative DNA repair machinery implicated in cell cycle control and apoptosis. Clonogenic data revealed a significant (P<0.05) 2-fold resistance to lipoplatin of HCT116 human colorectal adenocarcinoma cells lacking MLH1, one of five proteins crucial to MMR function, as compared to MLH1-expressing HCT116 cells. In addition, MLH1-deficient cells were at least 3-fold less susceptible to apoptosis (DNA fragmentation) than MLH1-proficient cells. However, proteolytic processing of caspase-3, caspase-7 and poly(ADP-ribose)polymerase-1 following lipoplatin treatment was comparable in MLH1-deficient cells and -proficient cells. Furthermore, MLH1-deficient cells retained the ability to attenuate cell cycle progression past the G2/M checkpoint following lipoplatin treatment. In conclusion, our results indicate that the lipoplatin-sensitive phenotype of MLH1-proficient cells correlated with increased apoptosis which may occur via caspase-independent pathways. They also suggest that the integrity of MMR function is a relevant determinant accounting for the cytotoxicity of lipoplatin. However, this does not seem to apply to lipoxal, a novel liposomal formulation of oxaliplatin, because MLH1-deficient cells were as sensitive to lipoxal as MLH1-proficient cells.
journal_name
Anticancer Drugsjournal_title
Anti-cancer drugsauthors
Fedier A,Poyet C,Perucchini D,Boulikas T,Fink Ddoi
10.1097/00001813-200603000-00010subject
Has Abstractpub_date
2006-03-01 00:00:00pages
315-23issue
3eissn
0959-4973issn
1473-5741pii
00001813-200603000-00010journal_volume
17pub_type
杂志文章abstract::Autophagy is a complex of adaptive cellular response that enhances cancer cell survival in the face of cellular stresses such as chemotherapy. Recently, chloroquine diphosphate (CQ), a widely used antimalarial drug, has been studied as a potential inhibitor of autophagy. Here, we aimed to investigate the role of CQ in...
journal_title:Anti-cancer drugs
pub_type: 杂志文章
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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journal_title:Anti-cancer drugs
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