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Hypoxia-inducible factor-1 (HIF-1) plays an important role in malignant tumor progression and in the development of resistance to radiotherapy. We designed a novel fusion protein (PTD-ODD-SAV [POS]) consisting of a protein transduction domain (PTD), streptavidin (SAV), and a portion of the oxygen-dependent degradation domain (ODD) of HIF-1alpha that confers the same oxygen-dependent regulation as HIF-1alpha on POS. (3-(123/125)I-iodobenzoyl)norbiotinamide ((123/125)I-IBB) was conjugated to the SAV moiety of POS to synthesize (123/125)I-IBB-labeled POS ((123/125)I-IPOS). The purpose of this study was to evaluate the feasibility of (123)I-IPOS as an imaging probe for HIF-1-active tumor hypoxia.

Imaging of HIF-1-Active Tumor Hypoxia Using a Protein Effectively Delivered to and Specifically Stabilized in HIF-1-Active Tumor Cells