AI Article Synopsis

  • Social behaviors are essential for human connection and can be affected by conditions like Autism Spectrum Disorder (ASD), which involves disruptions in the mesoaccumbens pathway (VTA and NAc).
  • The study investigates a specific mutation linked to ASD, using a -deficient rat model to assess how this mutation alters social reward processing and behavior.
  • Findings reveal that -deficient rats show unusual social interactions and struggle with reward-based behavior due to changes in neuronal activity, but adjusting VTA neuron activity can help normalize their behavior, suggesting potential intervention pathways.

Article Abstract

Social behaviors are crucial for human connection and belonging, often impacted in conditions like Autism Spectrum Disorder (ASD). The mesoaccumbens pathway (VTA and NAc) plays a pivotal role in social behavior and is implicated in ASD. However, the impact of ASD-related mutations on social reward processing remains insufficiently explored. This study focuses on the mutation, associated with a rare genetic condition and linked to ASD, examining its influence on the mesoaccumbens pathway during behavior, using the -deficient rat model. Our findings indicate that -deficient rats exhibit atypical social interactions and have difficulty adjusting behavior based on reward values, associated with modified neuronal activity of VTA dopaminergic and GABAergic neurons and reduced dopamine release in the NAc. Moreover, we demonstrate that manipulating VTA neuronal activity can normalize this behavior, providing insights into the effects of mutations on social reward and behavior, and identify a potential neural pathway for intervention.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10723340PMC
http://dx.doi.org/10.1101/2023.12.05.570134DOI Listing

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Article Synopsis
  • Social behaviors are essential for human connection and can be affected by conditions like Autism Spectrum Disorder (ASD), which involves disruptions in the mesoaccumbens pathway (VTA and NAc).
  • The study investigates a specific mutation linked to ASD, using a -deficient rat model to assess how this mutation alters social reward processing and behavior.
  • Findings reveal that -deficient rats show unusual social interactions and struggle with reward-based behavior due to changes in neuronal activity, but adjusting VTA neuron activity can help normalize their behavior, suggesting potential intervention pathways.
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Gestational exposure of mice to valproic acid (VPA) is one currently used experimental model for the investigation of typical failure symptoms associated with autism spectrum disorder (ASD). In the present study we hypothesized that the reduction of dopaminergic source neurons of the VTA, followed by perturbed growth of the mesotelencephalic dopamine pathway (MT), should also modify pattern formation in the dopaminoceptive target regions (particularly its mesoaccumbens/mesolimbic portion). Here, we investigated VPA-evoked cellular morphological (apoptosis-frequency detected by Caspase-3, abundance of Ca-binding proteins, CaBP), as well as synaptic proteomic (western blotting) changes, in selected dopaminoceptive subpallial, as compared to pallial, regions of mice, born to mothers treated with 500 mg/kg VPA on day 13.

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Survival under selective pressure is driven by the ability of our brain to use sensory information to our advantage to control physiological needs. To that end, neural circuits receive and integrate external environmental cues and internal metabolic signals to form learned sensory associations, consequently motivating and adapting our behaviour. The dopaminergic midbrain plays a crucial role in learning adaptive behaviour and is particularly sensitive to peripheral metabolic signals, including intestinal peptides, such as glucagon-like peptide 1 (GLP-1).

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Accumbal Histamine Signaling Engages Discrete Interneuron Microcircuits.

Biol Psychiatry

June 2023

Vanderbilt Brain Institute, Vanderbilt University, Nashville, Tennessee; Vanderbilt Center for Addiction Research, Vanderbilt University, Nashville, Tennessee; Department of Pharmacology, Vanderbilt University, Nashville, Tennessee; Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee; Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, Tennessee. Electronic address:

Background: Central histamine (HA) signaling modulates diverse cortical and subcortical circuits throughout the brain, including the nucleus accumbens (NAc). The NAc, a key striatal subregion directing reward-related behavior, expresses diverse HA receptor subtypes that elicit cellular and synaptic plasticity. However, the neuromodulatory capacity of HA within interneuron microcircuits in the NAc remains unknown.

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Nicotine Increases Spontaneous Glutamate Release in the Rostromedial Tegmental Nucleus.

Front Neurosci

January 2021

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The rostromedial tegmental nucleus (RMTg) is a bilateral structure localized in the brainstem and comprise of mainly GABAergic neurons. One of the main functions of the RMTg is to regulate the activity of dopamine neurons of the mesoaccumbens pathway. Therefore, the RMTg has been proposed as a modulator of the reward system and adaptive behaviors associated to reward learning.

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