Lipid peroxidation, linked to neurodegenerative diseases and mitochondrial dysfunction, targets polyunsaturated fatty acids (PUFAs) in cellular membranes. RT001, a novel drug with deuterium-substituted linoleic acid, inhibits lipid peroxidation by slowing down the chain reaction initiated by reactive oxygen species. Studies suggest that deuterated PUFAs presented in a fraction of the total PUFA pool, provide cellular protection. To gain insights into the underlying mechanisms, we utilized stimulated Raman scattering (SRS) imaging to analyze the subcellular distribution of RT001 using yeast as a model system. The isotopic substitution of deuterium enhances chemical contrast, enabling the observation of drug delivery dynamics. Concentration- and time-dependent aggregation of RT001 in lipid droplets and cell membranes were observed. SRS imaging holds promise for investigating metabolic processes of deuterated drugs such as RT001, thereby facilitating drug screening and development.
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