Interneuron transplantation targeting GABAergic network dysfunction is a novel alternative therapeutic approach for chronic focal epilepsy. However, in vivo monitoring of response to such cellular therapeutics remains challenging. Here, we combined high resolution in vivo and ex vivo 1H MRS to investigate the metabolic alterations in epileptic hippocampus in a preclinical model of chronic mesial temporal lobe epilepsy, and the effect of human inhibitory interneuron transplantation on metabolism. We discovered that hippocampal levels of GABA, NAA/Cr, GLX/Cr, GABA/GLX and GABA/NAA were reversed to healthy control levels in epileptic mice transplanted with inhibitory interneurons, providing unique biomarkers of therapeutic response.
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