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Updated: Jun 10, 2026
05:40
Dural Stimulation and Periorbital von Frey Testing in Mice As a Preclinical Model of Headache
Published on: July 29, 2021
Inhibiting astrocyte activation is effective in triptan-induced medication-overuse headache model and prolonged
Yanyun Wang1, Xiaoyan Zhang1, Yun Zhang1
1Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China.
Headache
|June 8, 2026
Summary
Sustained astrocyte activation in the trigeminal nucleus caudalis drives medication-overuse headache (MOH). Inhibiting these astrocytes offers a promising therapeutic strategy for MOH by reversing pain hypersensitivity.
Area of Science:
- Neuroscience
- Pain Research
- Pharmacology
Background:
- Medication-overuse headache (MOH) arises from chronic triptan use, causing persistent hyperalgesia.
- The underlying mechanisms of MOH, particularly the role of astrocytes in the trigeminal nucleus caudalis (TNC), are not fully understood.
- Central sensitization and neuroinflammation are implicated in MOH pathogenesis.
Purpose of the Study:
- To investigate the role of sustained astrocyte activation in the TNC in driving prolonged hyperalgesia in triptan-induced MOH.
- To evaluate the therapeutic potential of targeted astrocyte inhibition in a rat MOH model.
Main Methods:
- Established a rat model of MOH via repeated sumatriptan administration.
- Assessed cutaneous allodynia and latent sensitization.
- Utilized chemogenetics to selectively inhibit astrocyte activation in the TNC and analyzed neuronal, microglial, astrocytic, and inflammatory markers.
Main Results:
- Sumatriptan-induced MOH exhibited long-term allodynia and latent sensitization, with sustained astrocyte activation.
- Chemogenetic inhibition of TNC astrocytes prevented the development of MOH-associated hypersensitivity.
- Astrocyte inhibition ameliorated molecular markers, including synaptic proteins and proinflammatory cytokines.
Conclusions:
- Sustained astrocyte activation in the TNC is a key driver of prolonged hyperalgesia in triptan-induced MOH.
- Targeted astrocyte inhibition effectively reverses behavioral and molecular signs of MOH.
- Inhibiting astrocyte activity presents a promising therapeutic avenue for managing MOH.
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