title: Human platelets as a platform to monitor metabolic biomarkers using stable isotopes and LC-MS.
abstract: BACKGROUND
  Intracellular metabolites such as CoA thioesters are modulated in a number of clinical settings. Their accurate measurement from surrogate tissues such as platelets may provide additional information to current serum and urinary biomarkers.
  
  
  METHODS
  Freshly isolated platelets from healthy volunteers were treated with rotenone, propionate or isotopically labeled metabolic tracers. Using a recently developed LC-MS-based methodology, absolute changes in short-chain acyl-CoA thioesters were monitored, as well as relative metabolic labeling using isotopomer distribution analysis.
  
  
  RESULTS
  Consistent with in vitro experiments, isolated platelets treated with rotenone showed decreased intracellular succinyl-CoA and increased β-hydroxybutyryl-CoA, while propionate treatment resulted in increased propionyl-CoA. In addition, isotopomers of the CoAs were readily detected in platelets treated with the [(13)C]- or [(13)C(15)N]-labeled metabolic precursors.
  
  
  CONCLUSIONS
  Here, we show that human platelets can provide a powerful ex vivo challenge platform with potential clinical diagnostic and biomarker discovery applications.
authors: Department of Pharmacology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.
authors: Sankha S
authors: SS
authors: Basu
authors: Eric C
authors: EC
authors: Deutsch
authors: Alec A
authors: AA
authors: Schmaier
authors: David R
authors: DR
authors: Lynch
authors: Ian A
authors: IA
authors: Blair
mesh_terms: D000214:Acyl Coenzyme A / Q000378:metabolism; D001792:Blood Platelets / Q000378:metabolism*; D002247:Carbon Isotopes / Q000032:analysis / Q000378:metabolism; D002853:Chromatography, Liquid / Q000379:methods*; D004952:Esters / Q000378:metabolism; D006801:Humans; D007553:Isotope Labeling / Q000379:methods; D013058:Mass Spectrometry / Q000379:methods*; D009587:Nitrogen Isotopes / Q000032:analysis / Q000378:metabolism; D011422:Propionates / Q000378:metabolism; D013438:Sulfhydryl Compounds / Q000378:metabolism
chemical_list: D000214:Acyl Coenzyme A; D002247:Carbon Isotopes; D004952:Esters; D009587:Nitrogen Isotopes; D011422:Propionates; D013438:Sulfhydryl Compounds; C030372:3-hydroxybutyryl-coenzyme A; C012046:succinyl-coenzyme A