title: Imaging receptor for advanced glycation end product expression in mouse model of hind limb ischemia.
abstract: BACKGROUND
  The purpose of this study is to image the effect of diabetes on expression of receptor for advanced glycation endproducts (RAGE) in limb ischemia in live animals.
  
  
  METHODS
  Male wild-type C57BL/6 mice were either made diabetic or left as control. Two months later, diabetic and non-diabetic mice underwent left femoral artery ligation. The right leg served as lesion control. Five days later, mice were injected with 15.1 ± 4.4 MBq 99mTc-anti-RAGE F(ab')2 and 4 to 5 h later (blood pool clearance) underwent SPECT/CT imaging. At the completion of imaging, mice were euthanized, hind limbs counted and sectioned, and scans reconstructed. Regions of interest were drawn on serial transverse sections comprising the hind limbs and activity in millicuries summed and divided by the injected dose (ID). Quantitative histology was performed for RAGE staining and angiogenesis.
  
  
  RESULTS
  Uptake of 99mTc-anti-RAGE F(ab')2 as %ID × 10-3 was higher in the left (ischemic) limbs for the diabetic mice (n = 8) compared to non-diabetic mice (n = 8) (1.20 ± 0.44% vs. 0.49 ± 0.40%; P = 0.0007) and corresponded to less angiogenesis in the diabetic mice. Uptake was also higher in the right limbs of diabetic compared to non-diabetic animals (0.82 ± 0.33% vs. 0.40 ± 0.14%; P = 0.0004).
  
  
  CONCLUSIONS
  These data show the feasibility of imaging and quantifying the effect of diabetes on RAGE expression in limb ischemia.
authors.affiliation: Department of Medicine, Columbia University Medical Center, 622 West 168th St, PH 10 room 203, New York, NY 10032, USA. lj2129@columbia.edu.
authors.forename: Yared
authors.initials: Y
authors.lastname: Tekabe
authors.forename: Maria
authors.initials: M
authors.lastname: Kollaros
authors.forename: Chong
authors.initials: C
authors.lastname: Li
authors.forename: Geping
authors.initials: G
authors.lastname: Zhang
authors.forename: Ann Marie
authors.initials: AM
authors.lastname: Schmidt
authors.forename: Lynne
authors.initials: L
authors.lastname: Johnson