title: Real-time RT-PCR Ct values for blood GAPDH correlate with measures of vascular endothelial function in humans.
abstract: OBJECTIVE
  To date, there is a wide range of methods in use to assess endothelial function, each with its own advantages and limitations. Here, we tested hypothesis that real-time RT-PCR threshold value (Ct), which is reflective of mRNA level, for Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) from whole blood is indicative of endothelial function in humans.
  
  
  METHODS
  To assess vascular function, we measured baseline skin perfusion, postocclusion reactive hyperemia (PORH), and brachial artery flow-mediated dilatation (FMD) and tested for a possible correlation between vascular responses and blood GAPDH real-time RT-PCR Ct value in 75 healthy volunteers.
  
  
  RESULTS
  Tests known to measure, at least in part, endothelial function such as baseline skin perfusion, the 2-minute recovery PORH, and FMD exhibited significant positive correlations with blood GAPDH Ct values. In contrast, there was no significant correlation between Ct values for blood GAPDH and peak PORH, an endothelium-independent parameter.
  
  
  CONCLUSIONS
  Based on these findings, we report that GAPDH mRNA level in the blood correlates with vascular function in healthy subjects. This suggests that GAPDH mRNA level could be a potential biomarker of vascular endothelial function.
authors: Medical Research Institute, Division of Cardiovascular and Diabetic Medicine, Ninewells Hospital & Medical School, University of Dundee, Dundee, United Kingdom.
authors: Faisel
authors: F
authors: Khan
authors: Wen Ling
authors: WL
authors: Choong
authors: Qingyou
authors: Q
authors: Du
authors: Aleksandar
authors: A
authors: Jovanovi'c
mesh_terms: D000368:Aged; D001916:Brachial Artery / Q000502:physiology*; D004730:Endothelium, Vascular / Q000502:physiology*; D005260:Female; D005819:Genetic Markers; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000235:genetics*; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012333:RNA, Messenger / Q000097:blood*; D060888:Real-Time Polymerase Chain Reaction; D012039:Regional Blood Flow; D012867:Skin / Q000098:blood supply*; D013997:Time Factors; D014664:Vasodilation
chemical_list: D005819:Genetic Markers; D012333:RNA, Messenger; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases
keywords: GAPDH; biomarker; endothelial function; vascular function