Abstract:
:In both bacteria and eukaryotes the alkylated, oxidized, and deaminated bases and depurinated lesions are primarily repaired via an endogenous preventive pathway, i.e. base excision repair (BER). Radiation therapy and chemotherapy are two important modes of cancer treatment. Many of those therapeutic agents used in the clinic have the ability to induce the DNA damage; however, they may also be highly cytotoxic, causing peripheral toxicity and secondary cancer as adverse side effects. In addition, the damage produced by the therapeutic agents can often be repaired by the BER proteins, which in effect confers therapeutic resistance. Efficient inhibition of a particular BER protein(s) may increase the efficacy of current chemotherapeutic regimes, which minimizes resistance and ultimately decreases the possibility of the aforementioned negative side effects. Therefore, pharmacological inhibition of DNA damage repair pathways may be explored as a useful strategy to enhance chemosensitivity. Various agents have shown excellent results in preclinical studies in combination chemotherapy. Early phase clinical trials are now being carried out using DNA repair inhibitors targeting enzymes such as PARP, DNA-PK or MGMT. In the case of BER proteins, elimination of N-Methylpurine DNA glycosylase (MPG) or inhibition of AP-endonuclease (APE) increased sensitivity of cancer cells to alkylating chemotherapeutics. MPG(-/-) embryonic stem cells and cells having MPG knock-down by siRNA are hypersensitive to alkylating agents, whereas inhibition of APE by small molecule inhibitors sensitized cancer cells to alkylating chemotherapeutics. Thus, MPG and other BER proteins could be potential targets for chemosensitization.
journal_name
Anticancer Agents Med Chemjournal_title
Anti-cancer agents in medicinal chemistryauthors
Adhikari S,Choudhury S,Mitra PS,Dubash JJ,Sajankila SP,Roy Rdoi
10.2174/187152008784220366subject
Has Abstractpub_date
2008-05-01 00:00:00pages
351-7issue
4eissn
1871-5206issn
1875-5992journal_volume
8pub_type
杂志文章,评审abstract::Protein kinases are one of the largest known families of enzyme characterized by having a well conserved ATP binding pocket. Most of the synthetic kinase inhibitors are ATP-competitive, but display some potential problems, like selectivity, discrepancy between the in vitro and in vivo inhibition assays and an high ris...
journal_title:Anti-cancer agents in medicinal chemistry
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journal_title:Anti-cancer agents in medicinal chemistry
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journal_title:Anti-cancer agents in medicinal chemistry
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journal_title:Anti-cancer agents in medicinal chemistry
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journal_title:Anti-cancer agents in medicinal chemistry
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journal_title:Anti-cancer agents in medicinal chemistry
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journal_title:Anti-cancer agents in medicinal chemistry
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journal_title:Anti-cancer agents in medicinal chemistry
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journal_title:Anti-cancer agents in medicinal chemistry
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journal_title:Anti-cancer agents in medicinal chemistry
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