Using mass spectrometry imaging to map fluxes quantitatively in the tumor ecosystem.
Michaela Schwaiger-HaberEthan StancliffeDhanalakshmi S AnbukumarBlake E SellsJia YiKevin ChoKayla Adkins-TravisMilan G ChhedaLeah P ShriverGary J PattiPublished in: Nature communications (2023)
Tumors are comprised of a multitude of cell types spanning different microenvironments. Mass spectrometry imaging (MSI) has the potential to identify metabolic patterns within the tumor ecosystem and surrounding tissues, but conventional workflows have not yet fully integrated the breadth of experimental techniques in metabolomics. Here, we combine MSI, stable isotope labeling, and a spatial variant of Isotopologue Spectral Analysis to map distributions of metabolite abundances, nutrient contributions, and metabolic turnover fluxes across the brains of mice harboring GL261 glioma, a widely used model for glioblastoma. When integrated with MSI, the combination of ion mobility, desorption electrospray ionization, and matrix assisted laser desorption ionization reveals alterations in multiple anabolic pathways. De novo fatty acid synthesis flux is increased by approximately 3-fold in glioma relative to surrounding healthy tissue. Fatty acid elongation flux is elevated even higher at 8-fold relative to surrounding healthy tissue and highlights the importance of elongase activity in glioma.
Keyphrases
- mass spectrometry
- fatty acid
- high resolution
- liquid chromatography
- climate change
- human health
- gas chromatography
- high performance liquid chromatography
- gene expression
- capillary electrophoresis
- single cell
- cell therapy
- optical coherence tomography
- stem cells
- skeletal muscle
- fluorescence imaging
- magnetic resonance
- computed tomography
- type diabetes
- bone marrow
- contrast enhanced