Altered Neural Activity in the Mesoaccumbens Pathway Underlies Impaired Social Reward Processing in Shank3-Deficient
Marie Barbier1,2,3,4, Keerthi Thirtamara Rajamani1,2,3,4, Shai Netser5
1Department of Psychiatry, New York, NY, USA.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 14, 2025
Summary
Shank3 mutations impair social behaviors by altering brain reward pathways in rats. Targeting the ventral tegmental area (VTA) pathway can restore typical social interactions, offering insights into Autism Spectrum Disorder (ASD) interventions.
Area of Science:
- Neuroscience
- Genetics
- Behavioral Science
Background:
- Social behaviors are vital for human connection but can be disrupted by Autism Spectrum Disorder (ASD).
- The mesoaccumbens pathway, connecting the ventral tegmental area (VTA) to the nucleus accumbens (NAc), is crucial for social behavior and linked to ASD.
- The specific effects of ASD-related mutations, like Shank3, on this pathway's social reward processing are not well understood.
Purpose of the Study:
- To investigate how Shank3 mutations affect the mesoaccumbens pathway and social behavior.
- To explore the role of VTA and NAc neuronal activity in Shank3-associated social deficits.
- To determine if modulating VTA neuronal activity can ameliorate social impairments in a Shank3-deficient rat model.
Main Methods:
- Utilized a Shank3-deficient rat model to study social behaviors.
- Recorded neuronal activity in VTA dopaminergic and GABAergic neurons during social interactions.
- Measured dopamine release in the NAc.
- Intervened by manipulating VTA neuronal activity.
Main Results:
- Shank3-deficient rats displayed atypical social interactions.
- Altered neuronal activity was observed in VTA dopaminergic and GABAergic neurons.
- Reduced dopamine release was detected in the NAc of Shank3-deficient rats.
- Manipulation of VTA neuronal activity successfully normalized social behavior.
Conclusions:
- Shank3 mutations disrupt social reward processing via the mesoaccumbens pathway.
- VTA neuronal activity is a key factor in Shank3-related social deficits.
- Targeting the VTA offers a potential therapeutic strategy for ASD-related social impairments.
