Heather Ireland-Zecchini

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Pancreatic ductal adenocarcinoma (PDA) is among the most lethal human cancers in part because it is insensitive to many chemotherapeutic drugs. Studying a mouse model of PDA that is refractory to the clinically used drug gemcitabine, we found that the tumors in this model were poorly perfused and poorly vascularized, properties that are shared with human(More)
Cell surface glycans are involved in numerous physiological processes that involve cell-cell interactions and migration, including lymphocyte trafficking and cancer metastasis. We have used a bioorthogonal metabolic labeling strategy to detect cell surface glycans and demonstrate, for the first time, fluorescence and radionuclide imaging of sialylated(More)
Reporter genes are widely used in biology and only a limited number are available. We present a new reporter gene for the localization of mammalian cells and transgenic tissues based on detection of the bglA (SYNbglA) gene of Caldocellum saccharolyticum that encodes a thermophilic β-glucosidase. SYNbglA was generated by introducing codon substitutions to(More)
Tumour cells sustain their high proliferation rate through metabolic reprogramming, whereby cellular metabolism shifts from oxidative phosphorylation to aerobic glycolysis, even under normal oxygen levels. Hypoxia-inducible factor 1A (HIF1A) is a major regulator of this process, but its activation under normoxic conditions, termed pseudohypoxia, is not well(More)
Two reagents have been synthesized for selective labeling of cell surface azidoglycans, an unusually stable version of a dibenzocyclooctyne (TMDIBO) and a third-generation difluorinated cyclooctyne (DIFO3). Both syntheses are efficient with minimal purification, and the dibenzocyclooctyne is stable under basic and acidic conditions. Flow cytometric(More)
We report the first account of metabolically labelling N-acetylglucosamine, in conjunction with either N-acetylgalactosamine or N-acetylmannosamine using a combination of isonitrile- and azide-based chemistries. With the appropriately labelled fluorescent probe molecules, that react with either the azido or isonitrile groups, the method enabled(More)
Seeing the sugar coating: N-Acetyl-glucosamine and mannosamine derivatives tagged with an isonitrile group are metabolically incorporated into cell-surface glycans and can be detected with a fluorescent tetrazine. This bioorthogonal isonitrile-tetrazine ligation is also orthogonal to the commonly used azide-cyclooctyne ligation, and so will allow(More)
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