Polyamine flux analysis by determination of heavy isotope incorporation from 13C, 15N-enriched amino acids into polyamines by LC-MS/MS

被引:6
|
作者
Cerrada-Gimenez, Marc [1 ]
Hakkinen, Merja R. [2 ]
Vepsalainen, Jouko [2 ]
Auriola, Seppo [3 ]
Alhonen, Leena [1 ]
Keinanen, Tuomo A. [1 ,2 ]
机构
[1] Univ Eastern Finland, Bioctr Kuopio, AI Virtanen Inst, FI-70211 Kuopio, Finland
[2] Univ Eastern Finland, Bioctr Kuopio, Dept Biosci, Chem Lab, FI-70211 Kuopio, Finland
[3] Univ Eastern Finland, Bioctr Kuopio, Sch Pharm, FI-70211 Kuopio, Finland
基金
芬兰科学院;
关键词
Polyamines; Polyamine flux; LC/MS-MS; Fetal fibroblasts; SSAT; MDL; 72527; UNDERIVATIZED POLYAMINES; TRANSGENIC MICE; METABOLIC FLUX; CATABOLISM; SPERMIDINE; CANCER; PUTRESCINE; LIVER; IDENTIFICATION; ACCUMULATION;
D O I
10.1007/s00726-011-1024-x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
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 C-13, N-15-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.
引用
收藏
页码:451 / 460
页数:10
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