Targeting Reciprocally Connected Brain Regions Through CAV-2 Mediated Interventions.

Area of Science:

• Neuroscience
• Systems Neuroscience
• Computational Neuroscience

Background:

• Reciprocal connections between brain areas, known as "re-entry," are crucial for neural integration and synchronization.
• Assessing the functional impact of these bidirectional pathways has been historically challenging.
• Understanding re-entry mechanisms is key to deciphering complex neural circuit principles.

Purpose of the Study:

• To demonstrate a chemogenetic strategy for targeting projection-defined neurons in reciprocally connected brain regions.
• To investigate the functional role of bidirectional pathways using CAV-2 mediated interventions.
• To highlight the utility of CAV-2 strategies for circuit-level neuroscience research.

Main Methods:

• Utilized CAV-2 mediated interventions in rats to target projection neurons.
• Focused on bidirectional pathways between the dorsomedial prefrontal cortex (dmPFC) and mediodorsal thalamus.
• Examined reciprocal connections between the insular cortex (IC) and basolateral amygdala (BLA).

Main Results:

• Successfully targeted projection-defined neurons in reciprocal circuits using CAV-2.
• Demonstrated the effectiveness of this chemogenetic approach in studying neural pathways.
• Identified limitations of Cre-dependent adeno-associated viruses (AAVs) due to "leaked" expression.

Conclusions:

• CAV-2 mediated strategies are valuable tools for investigating circuit-level neuroscience.
• The study underscores the importance of appropriate control conditions when using viral vectors.
• This research provides a foundation for further exploration of re-entry mechanisms in neural circuits.