Metabolism based Fluorescent Imaging Service

Fluorescence Lifetime Imaging (FLIM) stands as a powerful label-free technique within the realm of metabolism-based fluorescent imaging. Its principal hinges on measuring the fluorescence decay time of key endogenous fluorophores, primarily Nicotinamide Adenine Dinucleotide (NADH) and its phosphorylated form (NADPH), collectively referred to as NAD(P)H, and Flavin Adenine Dinucleotide (FAD). These molecules are central players in the cellular redox reactions, serving as vital coenzymes in glycolysis, oxidative phosphorylation, and the pentose phosphate pathway (PPP).

Changes in the fluorescence lifetime of NAD(P)H and FAD directly reflect alterations in their binding state to enzymes and the overall redox potential of the cell, thereby acting as intrinsic indicators of the cellular metabolic state. This mechanism allows FLIM to meticulously detect shifts between glycolysis and oxidative phosphorylation, offering a quantitative assessment of metabolic activity at a subcellular resolution. Creative Biolabs utilizes advanced FLIM platforms to reveal subtle variations in metabolic profiles within a tumor, providing a comprehensive understanding of tumor heterogeneity—a critical factor in treatment resistance. Furthermore, monitoring changes in NAD(P)H and FAD fluorescence lifetime serves as an invaluable biomarker for indicating a tumor's early response to treatment, often long before volumetric changes become apparent. This capability extends to both microscopic analysis and whole-animal imaging, furnishing spatial and temporal information about tumor metabolism in a truly in vivo context.

Complementing the label-free approach of FLIM, specific metabolism-based fluorescent imaging techniques utilize exogenous fluorescent dyes engineered to target and label metabolites or integrate into specific metabolic pathways within tumors. This approach provides a powerful means for pathway-specific analysis, enabling researchers to selectively visualize and quantify the activity of distinct metabolic processes.

The mechanism involves fluorescent dyes designed to bind with high specificity to target metabolites or to undergo enzymatic conversion within a metabolic pathway, emitting fluorescence upon binding or transformation. This targeted labeling allows for highly granular analysis of specific metabolic activities, such as glucose uptake, lactate production, or amino acid metabolism. At Creative Biolabs, we leverage these advanced probes to enable real-time monitoring of metabolic changes within tumors, providing dynamic insights into how these pathways adapt under various conditions, including drug exposure. The ability to use different fluorescent dyes to visualize different metabolic pathways is particularly crucial for early-stage drug development, allowing for the precise study of the metabolic effects of novel therapeutic agents on tumors and the identification of potential metabolic vulnerabilities.

Optical Metabolic Imaging (OMI) encompasses a broader array of optical methods designed to detect dynamic changes in cellular metabolism, including shifts in fundamental processes like glycolysis and oxidative phosphorylation. OMI techniques are founded on the principle that metabolic activity induces detectable changes in fluorescence signals, either from endogenous fluorophores (like NAD(P)H and FAD, as in FLIM) or from exogenously introduced fluorescent probes. The significant advantages of OMI, which Creative Biolabs integrates into its comprehensive service offerings, include its cost-effectiveness, speed, and capacity for directly measuring immediate metabolic alterations. This makes OMI an exceptional tool for high-throughput screening and rapid assessment of metabolic responses in preclinical models.