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With the emergence of multimodal imaging strategies, genetically encoded reporters that can be flexibly combined with any imaging modality become highly attractive. Here we describe the use of glycosylphosphatidylinositol (GPI)-anchored avidin, an avidin moiety targeted to the extracellular side of cell membranes via a GPI anchor, as a reporter for in vivo imaging. Being present on the outside of cells, avidin can be visualized with any type of biotinylated imaging agent, without the requirement that the probe be membrane-permeable. We used the avidin-GPI system to monitor the activity of hypoxia-inducible factors (HIFs)-oxygen-sensing transcription factors, which play a major role in regulating cancer progression-in a mouse tumor allograft model.

Recording Intracellular Molecular Events from the Outside: Glycosylphosphatidylinositol-Anchored Avidin as a Reporter Protein for In Vivo Imaging