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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  99m Tc-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  99m Tc-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.

Imaging receptor for advanced glycation end product expression in mouse model of hind limb ischemia