title: Synthesis and characterization of N-coumaroyltyramine as a potent phytochemical which arrests human transformed cells via inhibiting protein tyrosine kinases.
abstract: Numerous phytochemicals are believed to have beneficial effects on human health. N-Coumaroyltyramine accumulates in plants in response to wounding and pathogen attack. Due to the scarcity of N-coumaroyltyramine, its biological activities have not been studied in human cells. In this study, N-coumaroyltyramine was chemically synthesized and then purified by an HPLC with a UV-visible absorbance detector. Retention times of major peaks were 14.3 and 20.7 min, and the peak at 20.7 min was confirmed by LC-MS as N-coumaroyltyramine with a mass/charge (m/z) unit of 284.1. The synthesis procedure was relatively easy and had an acceptable yield (approximately 55%). The compound exhibited a new activity, suppression of growth of human tumor cells such as U937 and Jurkat cells. In addition, the suppressed growth of the cells was strongly associated with an increased percentage of cells in the S phase of the cell cycle progression. Furthermore, N-coumaroyltyramine was able to inhibit the protein tyrosine kinases including epidermal growth factor receptor (EGFR). This is the first report of the growth suppressing activity of N-coumaroyltyramine and its arrest of cells at the S phase of the cell cycle, possibly by inhibition of protein tyrosine kinases.
authors.affiliation: Phytonutrients Laboratory, U.S. Department of Agriculture, Beltsville, Maryland 20705, USA. park@307.bhnrc.usda.gov
authors.forename: Jae B
authors.initials: JB
authors.lastname: Park
authors.forename: Norberta
authors.initials: N
authors.lastname: Schoene
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000138:chemical synthesis* / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D002461:Cell Line, Transformed; D002851:Chromatography, High Pressure Liquid; D003373:Coumaric Acids / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D004353:Drug Evaluation, Preclinical; D004791:Enzyme Inhibitors / Q000494:pharmacology; D066246:ErbB Receptors / Q000037:antagonists & inhibitors; D006801:Humans; D019169:Jurkat Cells / Q000187:drug effects; D013058:Mass Spectrometry; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors*; D016196:S Phase / Q000187:drug effects; D014439:Tyramine / Q000031:analogs & derivatives / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D020298:U937 Cells
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D003373:Coumaric Acids; D004791:Enzyme Inhibitors; C454112:N-coumaroyltyramine; D066246:ErbB Receptors; D011505:Protein-Tyrosine Kinases; D014439:Tyramine