It has been observed recently that transient intraperitoneal infusion of oxidized nicotinamide adenine dinucleotide (NAD+) can increase intracellular ATP levels in healthy rat brain over time. Intrigued by this fascinating phenomenon, we investigated the dynamic changes of major phosphorous metabolites and the kinetics and metabolic rates of the ATP synthesis reactions in rat brain before and after introducing exogenous NAD+ using combined in vivo 31P MR spectroscopy (MRS) imaging with magnetization transfer (MT) technique at 16.4 Tesla magnet. The results of this comprehensive study provide important information for elucidating the cerebral energetic mechanism and regulation underlying this phenomenon.
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