Abstract:
:UCN-01 is undergoing Phase I evaluation and is a candidate for combination strategies in the clinic. UCN-01 has been shown to have a variety of effects on cellular targets and the cell cycle. It has also been reported to sensitize cells to several clinical drugs in vitro, possibly in a manner related to p53 status. Thus, combinations of UCN-01 with a series of clinical agents in variety of cell lines have been investigated in vitro. Certain cell lines demonstrated synergistic interactions with combinations of UCN-01 (20-150 nM) and thiotepa, mitomycin C, cisplatin, melphalan, topotecan, gemcitabine, fludarabine or 5-fluorouracil. In contrast, UCN-01 combinations with the antimitotic agents, paclitaxel and vincristine, or topoisomerase II inhibitors, adriamycin and etoposide, did not result in synergy, only in additive toxicity. Cells with non-functional p53 were significantly more susceptible to the supra-additive effects of certain DNA-damaging agents and UCN-01 combinations, than cells expressing functional p53 activity. In contrast, there was no significant relationship between p53 status and susceptibility to synergy between antimetabolites and UCN-01. The mechanism behind the observed synergy appeared unrelated to effects on protein kinase C or abrogation of the cell cycle in G2. Moreover, increased apoptosis did not fully explain the supradditive response. These data indicate that UCN-01 sensitizes a variety of cell lines to certain DNA-damaging agents (frequently covalent DNA-binding drugs) and antimetabolites in vitro, but the mechanism underlying this interaction remains undefined.
journal_name
Invest New Drugsjournal_title
Investigational new drugsauthors
Monks A,Harris ED,Vaigro-Wolff A,Hose CD,Connelly JW,Sausville EAdoi
10.1023/a:1006313611677subject
Has Abstractpub_date
2000-05-01 00:00:00pages
95-107issue
2eissn
0167-6997issn
1573-0646journal_volume
18pub_type
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journal_title:Investigational new drugs
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journal_title:Investigational new drugs
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journal_title:Investigational new drugs
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journal_title:Investigational new drugs
pub_type: 临床试验,杂志文章
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