Abstract:
:2-Amino-4,4alpha-dihydro-4alpha,7-dimethyl-3H-phenoxazine-3-one (Phx-1) has been developed as a novel phenoxazine derivative having an anticancer activity on a variety of cancer cell lines as well as transplanted tumors in mice with minimal toxicity to normal cells. We examined the effects of Phx-1 on Jurkat cells, a human T cell line. Phx-1 inhibited proliferation of the cells in a dose-dependent manner but hardly induced cell death, suggesting that Phx-1 acts primarily as an antiproliferative reagent but not as a cytocidal drug. Phx-1 enhanced tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)-induced apoptotic cell death about 100-fold. Tumor necrosis factor alpha, which alone does not induce cell death of Jurkat cells, caused apoptosis in combination with Phx-1. These enhancements of cell death were not due to up-regulation of the death receptors. Phx-1 decreased serum-induced phosphorylation of Akt, a kinase involved in cell proliferation and survival, and inhibited complex III of mitochondrial respiratory chain. Considering that both TRAIL and Phx-1 have only marginal cytotoxicity to most normal cells, Phx-1 may provide an ideal combination for cancer therapy with TRAIL.
journal_name
Mol Cancer Therjournal_title
Molecular cancer therapeuticsauthors
Hara K,Okamoto M,Aki T,Yagita H,Tanaka H,Mizukami Y,Nakamura H,Tomoda A,Hamasaki N,Kang Ddoi
10.1158/1535-7163.MCT-05-0067keywords:
subject
Has Abstractpub_date
2005-07-01 00:00:00pages
1121-7issue
7eissn
1535-7163issn
1538-8514pii
4/7/1121journal_volume
4pub_type
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