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A GABAergic Projection from the Zona Incerta to the Rostral Ventromedial Medulla Modulates Descending Control of
Lijing Zou1,2, Hao Ding3,4, Yujiao Hu1,2
1Department of Anesthesiology, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310058, China.
Brain Sciences
|January 28, 2026
Summary
Researchers discovered a new inhibitory pathway from the zona incerta (ZI) to the rostral ventromedial medulla (RVM) that controls neuropathic pain. Activating this pathway reduces pain, while inhibiting it worsens pain, revealing a novel pain modulation mechanism.
Area of Science:
- Neuroscience
- Pain Research
- Cellular and Molecular Biology
Background:
- The rostral ventromedial medulla (RVM) is crucial for descending pain modulation.
- Inhibitory circuits regulating RVM activity in neuropathic pain are not well understood.
- The zona incerta (ZI), a GABAergic nucleus, is implicated in pain modulation but its RVM connection is unclear.
Purpose of the Study:
- To investigate the functional connection between the zona incerta (ZI) and the rostral ventromedial medulla (RVM).
- To determine the role of ZI-RVM inhibitory circuits in neuropathic pain.
- To explore potential therapeutic targets for pain management.
Main Methods:
- Utilized a chronic constriction injury (CCI) model to induce neuropathic pain.
- Employed anatomical tracing and activity mapping to study neuronal activation and connectivity.
- Used optogenetic and chemogenetic techniques to manipulate ZI-RVM projections and assessed mechanical sensitivity.
Main Results:
- CCI induced ipsilateral ZI neuron activation projecting to the RVM.
- Optogenetic activation of ZI terminals in the RVM alleviated mechanical allodynia.
- ZI-RVM pathway manipulation (optogenetic/chemogenetic) significantly altered pain behaviors, with activation reducing and inhibition exacerbating pain.
Conclusions:
- Identified a novel diencephalic-to-brainstem inhibitory pathway involving ZI projections to the RVM.
- This pathway dynamically controls RVM-mediated descending pain modulation during neuropathic pain.
- The ZI-RVM circuit represents a potential target for managing neuropathic pain.
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