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In the brain, glycogen, the storage form of glucose, is exclusively localized in astrocytes. Glycogenolysis leads to the production of L-lactate, which is shuttled to neurons for ATP production. Interestingly, L-lactate was recently shown to be not only a source of energy, but also a signaling molecule to neurons. This was demonstrated through the inhibition of L-lactate production or transport in an inhibitory avoidance paradigm, where the rodents developed amnesia. This inhibition of memory consolidation was rescued by L-lactate and not by equicaloric glucose emphasizing that L-lactate acts as a signaling molecule as well. A recent study in our laboratory suggests that the action of L-lactate takes place through a cascade of molecular events via the modulation of N-methyl-D-aspartate receptor (NMDAR) activity. Since NADH produced similar results to those seen with L-lactate, it was hypothesized that the action of the latter is based on altering the redox state of the cell, in particular in view of the fact that redox-sensitive sites are present on the NMDAR. However, the precise molecular mechanism underlying the apparent change in the NMDAR activity is not fully elucidated.