These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Distamycin A enhances the cytotoxicity of duocarmycin A and suppresses duocarmycin A-induced apoptosis in human lung carcinoma cells.
    Author: Hirota M, Fujiwara T, Mineshita S, Sugiyama H, Teraoka H.
    Journal: Int J Biochem Cell Biol; 2007; 39(5):988-96. PubMed ID: 17321782.
    Abstract:
    Duocarmycin A (Duo), which is one of well-known antitumor antibiotics, efficiently alkylates adenine N3 at the 3' end of AT-rich sequences in the DNA. The addition of a minor groove binder, distamycin A (Dist), not only accerelates the reactivity of Duo with oligonucleotide duplex but also switches the DNA-alkylation site to guanine in GC-rich sequences. Here we examined cytotoxic effect of Duo in the coexistence of Dist using human lung carcinoma (HLC-2) cells. The cytotoxicity of Duo to HLC-2 cells was enhanced 10 times by the addition of 0.5microg/ml Dist, which was much lower than the IC(50) value of 16microg/ml. Addition of Duo alone to HLC-2 cells resulted in typically apoptotic changes, including chromatin condensation, sub-G1 accumulation in DNA histogram pattern, and decrease in procaspase-3 and 9 levels. Interestingly, these apoptotic characteristics in Duo-treated cells were suppressed by the addition of 0.5microg/ml Dist, and the G2/M population in the cell cycle progression of HLC-2 cells was largely unchanged in the coexistence of Dist along with the extremely low accumulation of p53 and higher induction of p21. In contrast, the treatment of HLC-2 cells with Dist (16microg/ml) alone was observed to induce the accumulation of p53 and cell cycle arrest at the G1 phase. These results indicate that Dist suppresses apoptosis induced by Duo as well as enhances Duo-induced cytotoxicity in living cells, and may contribute to chemotherapy for tumors resistant to inducing apoptotic cell death.
    [Abstract] [Full Text] [Related] [New Search]