In tumour angiogenesis avb3 integrin is being expressed on endothelial cells. This thesis shows, that tumour-associated angiogenesis can be imaged via radioactive ligands of the avb3 integrin non-invasively. A431 cells, transplanted on nude mice, served as a tumour model. A431 cells did not show any uptake of the specific ligands ([18F]Gal-RGD/[125I]Glc-RGD). The tumours showed intense uptake of [18F]Gal-RGD (tumour/blood ratio after 90 min: 9.8), which could be inhibited by the avb3 ligand c(RGD)yV (-73%). This could be measured by positron emission tomography non-invasively. Tumor blood vessels showed immunhistochemically avb3 expression, in contrast to the tumour cells themselves. It was confirmed in-vitro, that proliferating human endothelial cells internalized [18F]Gal-RGD and [I125]Glc-RGD avß3-specifically. [18F]Gal-RGD-PET is a promising method to image angiogenesis in patients.
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In tumour angiogenesis avb3 integrin is being expressed on endothelial cells. This thesis shows, that tumour-associated angiogenesis can be imaged via radioactive ligands of the avb3 integrin non-invasively. A431 cells, transplanted on nude mice, served as a tumour model. A431 cells did not show any uptake of the specific ligands ([18F]Gal-RGD/[125I]Glc-RGD). The tumours showed intense uptake of [18F]Gal-RGD (tumour/blood ratio after 90 min: 9.8), which could be inhibited by the avb3 ligand c(RG...
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