title: Polyamine flux analysis by determination of heavy isotope incorporation from 13C, 15N-enriched amino acids into polyamines by LC-MS/MS.
abstract: The study of polyamine flux, i.e. the circulating flow of polyamines through the interconnected biosynthetic and catabolic pathways, is of considerable interest because of the established links between the polyamine metabolism and many diseases, such as cancer and diabetes. To study polyamine flux in detail, a novel method based on following the label incorporation from the (13)C, (15)N-labeled polyamine precursors, arginine, methionine and ornithine, into polyamines by LC-MS/MS was implemented. This methodology was tested on three distinct cell lines with different spermidine/spermine-N (1)-acetyltransferase (SSAT) expression levels, i.e. non-transgenic, transgenic and knockout. These trials allowed the identification of the critical conditions for the successful polyamine flux measurement, such as the functional time frame of label incorporation, until plateau phase with the selected precursor is reached. The novel LC-MS/MS-based method for polyamine flux overcame the limitations of previous existing methodologies, with baseline separation of the different polyamine species and the exact quantification of the incorporated label. Moreover, the obtained results clearly show that the increased SSAT expression is associated with accelerated polyamine flux.
authors.affiliation: Biotechnology and Molecular Medicine, A.I. Virtanen Institute, Biocenter Kuopio, University of Eastern Finland, Kuopio Campus, P. O. Box 1627, FI70211, Kuopio, Finland. Marc.CerradaGimenez@uef.fi
authors.forename: Marc
authors.initials: M
authors.lastname: Cerrada-Gimenez
authors.forename: Merja R
authors.initials: MR
authors.lastname: Häkkinen
authors.forename: Jouko
authors.initials: J
authors.lastname: Vepsäläinen
authors.forename: Seppo
authors.initials: S
authors.lastname: Auriola
authors.forename: Leena
authors.initials: L
authors.lastname: Alhonen
authors.forename: Tuomo A
authors.initials: TA
authors.lastname: Keinänen
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D015317:Biogenic Polyamines / Q000378:metabolism*; D002138:Calibration; D002247:Carbon Isotopes; D002853:Chromatography, Liquid / Q000379:methods*; D003470:Culture Media; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009587:Nitrogen Isotopes; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D000596:Amino Acids; D015317:Biogenic Polyamines; D002247:Carbon Isotopes; D003470:Culture Media; D009587:Nitrogen Isotopes