In vivo imaging of HIF-active tumors by an oxygen-dependent degradation protein probe with an interchangeable labeling system

• Published in: PloS one 2010-12, Vol.5 (12), p.e15736-e15736
• Main Authors: Kuchimaru, Takahiro, Kadonosono, Tetsuya, Tanaka, Shotaro, Ushiki, Takashi, Hiraoka, Masahiro, Kizaka-Kondoh, Shinae
• Format: Article
• Language: English
• Subjects: Angiogenesis; Animal models; Animals; Apoptosis; Biological products; Biology; Biotechnology; Cancer; Cancer therapies; Degradation; Dyes; Energy metabolism; Fluorescence; Fluorescent Dyes - chemistry; Fluorescent Dyes - pharmacology; Gene expression; Heart attacks; HeLa Cells; Humans; Hydroxylases; Hypoxia; Hypoxia-Inducible Factor 1, alpha Subunit - metabolism; Hypoxia-inducible factors; I.R. radiation; Immunohistochemistry - methods; Labeling; Labelling; Ligands; Localization; Male; Medicine; Metabolism; Mice; Mice, Inbred BALB C; Monitoring; Mutation; Neoplasm Transplantation; Oxygen; Oxygen - chemistry; Oxygen - metabolism; Oxygen probes; Pancreatic cancer; Pancreatic Neoplasms - metabolism; Physiological aspects; pOH; Point mutation; Protein Structure, Tertiary; Proteins; Recombinant Fusion Proteins - chemistry; Recombinant proteins; Recombinant Proteins - chemistry; Transcription; Trends; Tumors
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0015736

Hypoxia-inducible factor (HIF) functions as a master transcriptional regulator for adaptation to hypoxia by inducing adaptive changes in gene expression for regulation of proliferation, angiogenesis, apoptosis and energy metabolism. Cancers with high expression of the alpha subunit of HIF (HIFα) are often malignant and treatment-resistant. Therefore, the development of a molecular probe that can detect HIF activity has great potential value for monitoring tumor hypoxia. HIF prolyl hydroxylases (HPHDs) act as oxygen sensors that regulate the fate of HIFα protein through its oxygen-dependent degradation (ODD) domain. We constructed a recombinant protein PTD-ODD-HaloTag (POH) that is under the same ODD regulation as HIFα and contains protein transduction domain (PTD) and an interchangeable labeling system. Administration of near-infrared fluorescently labeled POH (POH-N) to mouse models of cancers allowed successful monitoring of HIF-active regions. Immunohistochemical analysis for intratumoral localization of POH probe revealed its specificity to HIF-active cells. Furthermore, lack of the PTD domain or a point mutation in the ODD domain abrogated the specificity of POH-N to HIF-active cells. Overall results indicate that POH is a practical probe specific to HIF-active cell in cancers and suggest its large potential for imaging and targeting of HIF-related diseases.