Simultaneous analysis of angiotensin peptides by LC-MS and LC-MS/MS: metabolism by bovine adrenal endothelial cells. Anal Biochem 2007 Oct 01;369(1):27-33
Date
08/08/2007Pubmed ID
17681269Pubmed Central ID
PMC2754136DOI
10.1016/j.ab.2007.06.045Scopus ID
2-s2.0-34548176232 (requires institutional sign-in at Scopus site) 45 CitationsAbstract
Liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods were developed to simultaneously determine the concentrations of angiotensin (Ang) II, Ang 1-7, Ang III, and Ang IV in biological samples. The samples were extracted with C18 solid-phase extraction cartridges and separated by a reverse-phase C18 column using acetonitrile in water with 0.1% formic acid as a mobile phase. Ang peptides were ionized by electrospray and detected by triple quadrupole MS in the positive ion mode. (M+3H)(3+) and (M+2H)(2+) ions were chosen as the detected ions in the single ion recording (SIR) mode for LC-MS. The limits of detection (signal/noise [S/N]=3) using SIR are 1 pg for Ang IV and 5 pg for Ang 1-7, Ang III, and Ang II. Multiple reaction monitoring (MRM) mode was used for LC-MS/MS. The limits of detection (S/N =3) using MRM are 20 pg for Ang IV and 25 pg for Ang 1-7, Ang III, and Ang II. These methods were applied to analyze Ang peptides in bovine adrenal microvascular endothelial cells. The results show that Ang II is metabolized by endothelial cells to Ang 1-7, Ang III, and Ang IV, with Ang 1-7 being the major metabolite.
Author List
Cui L, Nithipatikom K, Campbell WBAuthor
William B. Campbell PhD Professor in the Pharmacology and Toxicology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Adrenal GlandsAngiotensins
Animals
Cattle
Chromatography, Liquid
Endothelial Cells
Mass Spectrometry
Peptides
Reproducibility of Results
Sensitivity and Specificity
Solid Phase Extraction
Tandem Mass Spectrometry
Time Factors
