The elevated plus maze test showed that GD-23 (N-carbobenzoxy-L-tryptophanyl-L-isoleucine amide), an original dipeptide ligand of TSPO, exerted anxiolytic effect when injected intraperitoneally at a dose of 0.5 mg/kg. This effect was completely blocked by the selective neurosteroid synthesis inhibitors, enzymes trilostane and finasteride. The same inhibitors do not prevent the anxiolytic effects of the benzodiazepine tranquillizer diazepam. The results of the study indicate the selective neurosteroidogenic mechanism of the anxiolytic action of GD-23.
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