Journal of Biochemistry Advance Access originally published online on September 23, 2006
Journal of Biochemistry 2006 140(5):657-666; doi:10.1093/jb/mvj193
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© 2006 The Japanese Biochemical Society.
ARTICLE |
Polyamine Analogs with Xylene Rings Induce Antizyme Frameshifting, Reduce ODC Activity, and Deplete Cellular Polyamines
1 Department of Human Genetics, University of Utah, 15 N 2030 E, Rm 7410, Salt Lake City, UT 84112-5330, USA; 2 MediQuest Therapeutics, Inc., 22322 20th Avenue SE, Ste. 100, Bothell, WA 98021, USA; and 3 Pharmacology and Therapeutics Dept., Roswell Park Cancer Institute, Buffalo, NY 14263, USA
To whom correspondence should be addressed. Phone: +1-801-585-1927, Fax: +1-801-585-3910, E-mail: mhoward{at}genetics.utah.edu
Numerous studies have correlated elevated polyamine levels with abnormal or rapid cell growth. One therapeutic strategy to treat diseases with increased cellular proliferation rates, most obviously cancer, has been to identify compounds which lower cellular polyamine levels. An ideal target for this strategy is the protein antizyme—a negative regulator of polyamine biosynthesis and import, and a positive regulator of polyamine export. In this study, we have optimized two tissue-culture assays in 96-well format, to allow the rapid screening of a 750-member polyamine analog library for compounds which induce antizyme frameshifting and fail to substitute for the natural polyamines in growth. Five analogs (MQTPA1–5) containing xylene (1,4-dimethyl benzene) were found to be equal to or better than spermidine at stimulating antizyme frameshifting and were inefficient at rescuing cell growth following polyamine depletion. These compounds were further characterized for effects on natural polyamine levels and enzymes involved in polyamine metabolism. Finally, direct measurements of antizyme induction in cells treated with two of the lead compounds revealed an 8- to 15-fold increase in antizyme protein over untreated cells. The impact of the xylene moiety and the distance between the positively charged amino groups on antizyme frameshifting and cell growth are discussed.
* These authors contributed equally to the work.
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