Sex-specific spatial memory deficits in mice with a conditional TrkB deletion on parvalbumin interneurons.

Schizophrenia is a debilitating disorder characterised by three main symptom categories: positive, negative and cognitive. Cognitive symptoms emerge first, and currently do not have appropriate treatments, despite being a strong predictor of the severity and progress of the illness. Cognitive deficits are strongly associated with the dysfunction of GABAergic parvalbumin interneurons (PV-IN). PV-IN are supported by Brain-Derived Neurotrophic Factor (BDNF) via its receptor Tropomyosin-related Kinase B (TrkB). The main aim of this study was to investigate the cognitive and affective consequences of disrupted BDNF-TrkB signalling at PV-IN. We crossed PV-Cre mice with heterozygous TrkB floxed mice (PV-Cre:Fl+/−) to knock-down TrkB receptors on PV-IN. Male and female mice underwent a battery of tests including: Y-Maze, Cheeseboard Maze, Elevated Plus Maze, and Locomotor activity. Co-expression of PV and TrkB in the hippocampus was assessed by fluorescent immunohistochemistry and detailed stereology.