title: Quantitative analysis of phosphatidylcholines and phosphatidylethanolamines in urine of patients with breast cancer by nanoflow liquid chromatography/tandem mass spectrometry.
abstract: Phosphatidylcholines (PCs) and phosphatidylethanolamines (PEs) from urine of patients with breast cancer were qualitatively and quantitatively analyzed by nanoflow liquid chromatography-electrospray ionization tandem mass spectrometry (nLC-ESI-MS-MS). Urinary phospholipids (PLs) were extracted from three different categories of patients (non-cancer controls and breast cancer patients before and after surgery) by first lyophilizing only 1 mL of urine sample to enrich PLs. Next, nLC-ESI-MS-MS analysis of intact urinary phospholipids was performed, resulting in structural identification of 21 PCs and 12 PEs, followed by quantitative analysis using a multiple standard addition method. This study demonstrated that nLC-ESI-MS-MS can be powerfully utilized for the study of relative changes in the contents and concentration of urinary PCs and PEs from breast cancer patients: total concentration of PCs and PEs of patient sample increased to (144 +/- 9)% and (171 +/- 11)%, respectively, compared to control sample but they decreased significantly following surgery.
authors.affiliation: Department of Chemistry, Yonsei University, Seoul, 120-749, South Korea.
authors.forename: Hanna
authors.initials: H
authors.lastname: Kim
authors.forename: Hye Kyeong
authors.initials: HK
authors.lastname: Min
authors.forename: Gu
authors.initials: G
authors.lastname: Kong
authors.forename: Myeong Hee
authors.initials: MH
authors.lastname: Moon
mesh_terms: D000328:Adult; D001943:Breast Neoplasms / Q000652:urine*; D002853:Chromatography, Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D008875:Middle Aged; D010713:Phosphatidylcholines / Q000652:urine*; D010714:Phosphatidylethanolamines / Q000652:urine*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods; D013997:Time Factors
chemical_list: D010713:Phosphatidylcholines; D010714:Phosphatidylethanolamines