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Updated: Sep 24, 2025
04:59
Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors
Published on: September 27, 2019
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Infralimbic cortex-medial striatum projections modulate the itch processing
Miao Chen1, Ting He1, Xiao-Han Yi1
1Experimental Center of Basic Medicine, Army Medical University, Chongqing 400038, China.
Experimental Neurology
|May 3, 2022
Summary
The infralimbic cortex (IL) regulates itch processing. Inhibiting IL neurons reduces scratching, and IL-medial striatum (MS) pathways are key to modulating itch.
Area of Science:
- Neuroscience
- Primatology
- Behavioral Science
Background:
- Itch processing involves peripheral and spinal mechanisms, but brain mechanisms remain unclear.
- The medial prefrontal cortex (mPFC), including anterior cingulate cortex (ACC) and prelimbic cortex (PrL), is implicated in itch regulation.
- The role of the infralimbic cortex (IL), another mPFC subregion, in itch processing is unknown.
Purpose of the Study:
- To investigate the role of the infralimbic cortex (IL) in modulating itch processing.
- To identify specific neural pathways within the mPFC involved in itch regulation.
Main Methods:
- Pharmacogenetic manipulation of IL excitatory pyramidal neurons in a rodent model.
- Electrophysiological recordings to assess neuronal activity during scratching behavior.
- Anatomical tracing to identify IL projections to the medial striatum (MS).
Main Results:
- IL excitatory pyramidal neuron activity significantly increased during itch-related scratching.
- Pharmacogenetic inhibition of IL neurons markedly reduced itch-related scratching behavior.
- IL-MS projections were identified as a critical neural pathway for itch modulation.
Conclusions:
- The infralimbic cortex (IL) plays a significant regulatory role in itch processing.
- IL-MS projections are a key neural circuit involved in modulating itch behavior.
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