Intravital multiphoton microscopy of the metabolic co-enzymes NAD(P)H and FAD (optical metabolic imaging, or OMI) provides label-free imaging of metabolic changes in vivo. Since the metabolism of tumor and immune cells is associated with cancer progression, we aim to study metabolic changes during a triple-combination immunotherapy regimen that cures murine melanoma tumors. Our results demonstrate that intravital OMI can capture tumor and T cell autofluorescence intensity and lifetime changes during immunotherapy. Overall, this technology enables analysis of single cell metabolic changes in vivo to provide insight for immunotherapy development.
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