ABSTRACT
The chemically simple, biologically complex eukaryotic polyamines, spermidine and spermine, are positively charged alkylamines involved in many crucial cellular processes. Along with their diamine precursor putrescine, their normally high intracellular concentrations require fine attenuation by multiple regulatory mechanisms to keep these essential molecules within strict physiologic ranges. Since the metabolism of and requirement for polyamines are frequently dysregulated in neoplastic disease, the metabolic pathway and functions of polyamines provide rational drug targets; however, these targets have been difficult to exploit for chemotherapy. It is the goal of this article to review the latest findings in the field that demonstrate the potential utility of targeting the metabolism and function of polyamines as strategies for both chemotherapy and, possibly more importantly, chemoprevention.
Subject(s)
Neoplasms/drug therapy , Neoplasms/prevention & control , Polyamines/metabolism , Antineoplastic Agents/administration & dosage , Antineoplastic Agents/pharmacology , Biological Transport , Drug Therapy, Combination , Humans , Neoplasms/metabolismABSTRACT
It is estimated that the etiology of 20-30% of epithelial cancers is directly associated with inflammation, although the direct molecular events linking inflammation and carcinogenesis are poorly defined. In the context of gastrointestinal disease, the bacterium enterotoxigenic Bacteroides fragilis (ETBF) is a significant source of chronic inflammation and has been implicated as a risk factor for colorectal cancer. Spermine oxidase (SMO) is a polyamine catabolic enzyme that is highly inducible by inflammatory stimuli resulting in increased reactive oxygen species (ROS) and DNA damage. We now demonstrate that purified B. fragilis toxin (BFT) up-regulates SMO in HT29/c1 and T84 colonic epithelial cells, resulting in SMO-dependent generation of ROS and induction of γ-H2A.x, a marker of DNA damage. Further, ETBF-induced colitis in C57BL/6 mice is associated with increased SMO expression and treatment of mice with an inhibitor of polyamine catabolism, N(1),N(4)-bis(2,3-butandienyl)-1,4-butanediamine (MDL 72527), significantly reduces ETBF-induced chronic inflammation and proliferation. Most importantly, in the multiple intestinal neoplasia (Min) mouse model, treatment with MDL 72527 reduces ETBF-induced colon tumorigenesis by 69% (P < 0.001). The results of these studies indicate that SMO is a source of bacteria-induced ROS directly associated with tumorigenesis and could serve as a unique target for chemoprevention.
Subject(s)
Bacteroides fragilis/physiology , Colonic Neoplasms/microbiology , Polyamines/metabolism , Precancerous Conditions/microbiology , Acetyltransferases/metabolism , Animals , Bacterial Toxins/toxicity , Bacteroides fragilis/drug effects , Cell Line , Cell Proliferation/drug effects , Colitis/pathology , Colonic Neoplasms/complications , Colonic Neoplasms/pathology , DNA Damage , Disease Models, Animal , Enzyme Induction/drug effects , Epithelial Cells/drug effects , Epithelial Cells/enzymology , Humans , Inflammation/complications , Inflammation/pathology , Intestines/drug effects , Intestines/pathology , Mice , Mice, Inbred C57BL , Oxidoreductases Acting on CH-NH Group Donors/biosynthesis , Oxidoreductases Acting on CH-NH Group Donors/metabolism , Precancerous Conditions/pathology , Putrescine/analogs & derivatives , Putrescine/pharmacology , Recombinant Proteins/toxicity , Polyamine OxidaseABSTRACT
Spermine oxidase (SMO), the most recently characterized polyamine metabolic enzyme, catalyzes the direct back-conversion of spermine to spermidine in an FAD-dependent reaction that also yields the byproducts hydrogen peroxide (H(2)O(2)) and 3-aminopropanal. These metabolites, particularly H(2)O(2), have been implicated in cytotoxic cellular responses to specific antitumor polyamine analogs, as well as in the inflammation-associated generation of DNA damage. This chapter describes a rapid, sensitive, and inexpensive method for the chemiluminescent measurement of SMO (or alternatively, N (1)-acetyl polyamine oxidase, APAO) enzyme activity in cultured cell lysates, without the need for radioactive reagents or the use of high performance liquid chromatography (HPLC). Specifically, H(2)O(2) production by SMO is coupled to chemiluminescence generated by the horseradish peroxidase-catalyzed oxidation of luminol. Detailed protocols for preparation of reagents, harvesting cell lysates, generation of a standard curve, assaying of samples, and calculation of SMO enzyme activity are presented.