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Alterations in neuronal cytoskeletal and astrocytic proteins content in the brain of the autistic-like mouse strain C58/J.
Neuroscience Letters 2018 August 25
Autism spectrum disorder (ASD) is a neurodevelopment disorder characterized by deficient social interaction, impaired communication as well as repetitive behaviors. ASD subjects present connectivity and neuroplasticity disturbances associated with morphological alterations in axons, dendrites, and dendritic spines. Given that the neuronal cytoskeleton and astrocytes have an essential role in regulating several mechanisms of neural plasticity, the aim of this work was to study alterations in the content of neuronal cytoskeletal components actin and tubulin and their associated proteins, as well as astrocytic proteins GFAP and TSP-1 in the brain of a C58/J mouse model of ASD. We determined the expression and regulatory phosphorylation state of cytoskeletal components in the prefrontal cortex, hippocampus, and cerebellum of C58/J mice by means of Western blotting. Our results show that autistic-like mice present: 1) region-dependent altered expression and phosphorylation patterns of Tau isoforms, associated with anomalous microtubule depolymerization; 2) reduced MAP2 A content in prefrontal cortex; 3) region-dependent changes in cofilin expression and phosphorylation, associated with abnormal actin filament depolymerizing dynamics; 4) diminished synaptopodin levels in the hippocampus; and 5) reduced content of the astrocyte-secreted protein TSP-1 in the prefrontal cortex and hippocampus. Our work demonstrates changes in the expression and phosphorylation of cytoskeletal proteins as well as in TSP-1 in the brain of the autistic-like mice C58/J, shedding light in one of the possible molecular mechanisms underpinning neuroplasticity alterations in the ASD brain and laying the foundation for future investigations in this topic.
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