In this study, we found that serotonin tissue content and the density of serotonin axons is reduced in the hippocampus of BTBR mice in comparison to C57BL/6J (C57) mice. Forebrain serotonin receptors and the response to serotonin drugs are altered in BTBR mice, yet it remains unknown if serotonin neurons themselves are abnormal. The inbred mouse strain BTBR T + Itpr3 tf /J ( BTBR) is studied as a model of idiopathic autism because they are less social and more resistant to change than other strains. Serotonin neuron abnormalities in the BTBR mouse model of autism.

Thus, serotonin neurons exhibit region-dependent abnormalities in the BTBR mouse that may contribute to their altered behavioral profile. Metrics of serotonin neurons in the rostral 2/3 of the dorsal raphe and serotonin content of the prefrontal cortex were less impacted. These changes included increased numbers of serotonin neurons and hyperactivation of Fos expression. This was accompanied by possible compensatory changes in serotonin neurons that were most pronounced in regions known to provide innervation to the hippocampus: the caudal dorsal raphe (B6) and the median raphe. The inbred mouse strain BTBR T+ Itpr3tf/J ( BTBR) i studied as a model of idiopathic autism because they are less social and more resistant to change than other strains. Serotonin Neuron Abnormalities in the BTBR Mouse Model of Autism

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