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Updated: Jul 4, 2025
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A Guide to In vivo Single-unit Recording from Optogenetically Identified Cortical Inhibitory Interneurons
Published on: November 7, 2014
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Intersectional strategy to study cortical inhibitory parvalbumin-expressing interneurons
Rebeka Palicz1, Bettina Pater2, Pavel Truschow2
1Center Anatomy, Institute for Neuroanatomy, University of Göttingen, Göttingen, Germany. rebeka.palicz@med.uni-goettingen.de.
Scientific Reports
|February 3, 2024
Summary
The common PV-Cre/tdTomato mouse model inaccurately labels some excitatory neurons as inhibitory. A new Vgat-Cre/PV-Flp/tdTomato model accurately identifies GABAergic parvalbumin interneurons for better research.
Area of Science:
- Neuroscience
- Cell Biology
Background:
- Parvalbumin-expressing (PV) interneurons are crucial for maintaining the excitatory-inhibitory balance in the cortex.
- Reliable animal models are essential for studying the circuit functions of PV interneurons.
Purpose of the Study:
- To evaluate the specificity and sensitivity of the widely used PV-Cre/tdTomato mouse line for studying PV interneurons.
- To identify a more accurate transgenic model for research on inhibitory PV interneurons.
Main Methods:
- Assessed colocalization of tdTomato transgene with parvalbumin, GAD1 (inhibitory marker), Vglut1 (excitatory marker), and WFA (perineuronal net marker) in PV-Cre/tdTomato mice.
- Utilized an intersectional transgenic mouse line (Vgat-Cre/PV-Flp/tdTomato) for comparison.
Main Results:
- A significant population of layer 5 PV neurons in the PV-Cre/tdTomato mouse line were found to be excitatory, not inhibitory.
- The Vgat-Cre/PV-Flp/tdTomato mouse line showed no colocalization of tdTomato with the Vglut1 probe, indicating accurate labeling.
Conclusions:
- The PV-Cre/tdTomato mouse line exhibits limitations in accurately identifying inhibitory PV interneurons.
- The Vgat-Cre/PV-Flp/tdTomato mouse line presents a more reliable model for functional studies of GABAergic PV interneurons.
