Shotgun lipidomics for candidate biomarkers of urinary phospholipids in prostate cancer |
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Authors: | Hye Kyeong Min Sangsoo Lim Bong Chul Chung Myeong Hee Moon |
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Institution: | (1) Department of Chemistry, Yonsei University, Seoul, 120-749, South Korea;(2) Life Sciences Division, Korea Institute of Science and Technology (KIST), Seoul, 136-791, South Korea; |
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Abstract: | Qualitative and quantitative profiling of six different categories of urinary phospholipids (PLs) from patients with prostate
cancer was performed to develop an analytical method for the discovery of candidate biomarkers by shotgun lipidomics method.
Using nanoflow liquid chromatography–electrospray ionization–tandem mass spectrometry, we identified the molecular structures
of a total of 70 PL molecules (21 phosphatidylcholines (PCs), 11 phosphatidylethanolamines (PEs), 17 phosphatidylserines (PSs),
11 phosphatidylinositols (PIs), seven phosphatidic acids, and three phosphatidylglycerols) from urine samples of healthy controls
and prostate cancer patients by data-dependent collision-induced dissociation. Identified molecules were quantitatively examined
by comparing the MS peak areas. From statistical analyses, one PC, one PE, six PSs, and two PIs among the PL species showed
significant differences between controls and cancer patients (p < 0.05, Student’s t test), with concentration changes of more than threefold. Cluster analysis of both control and patient groups showed that
18:0/18:1-PS and 16:0/22:6-PS were 99% similar in upregulation and that the two PSs (18:1/18:0, 18:0/20:5) with two PIs (18:0/18:1
and 16:1/20:2) showed similar (>95%) downregulation. The total amount of each PL group was compared among prostate cancer
patients according to the Gleason scale as larger or smaller than 6. It proposes that the current study can be utilized to
sort out possible diagnostic biomarkers of prostate cancer. |
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