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The Sciatic Nerve Cuffing Model of Neuropathic Pain in Mice
Published on: July 16, 2014
Targeting 5-HT7 Receptor with Biased Ligands to Alleviate Pain and Spinal Neuroinflammation
Fahima Madouri1, Cyril Guimpied1, Enora Pigeon1
1Centre de Biophysique Moléculaire, UPR 4301 CNRS, rue Charles Sadron Orléans, Cedex 2, 45071, France.
ACS Chemical Neuroscience
|May 29, 2026
Summary
Two novel biased ligands for the serotonin 5-HT7 receptor (5-HT7R), Serodolin and MOA51, effectively reduced inflammatory and neuropathic pain without causing tolerance. These ligands also decreased spinal neuroinflammation, showing analgesic potential.
Area of Science:
- Neuropharmacology
- GPCR Signaling
Background:
- The serotonin 5-HT7 receptor (5-HT7R) is a G protein-coupled receptor (GPCR) highly expressed in the CNS.
- It is a therapeutic target for CNS disorders, including pain, sleep disturbances, and neuropsychiatric conditions.
- Biased signaling, which selectively activates downstream pathways, is a key concept in GPCR pharmacology.
Purpose of the Study:
- To compare the pharmacological and safety profiles of two biased 5-HT7R ligands, Serodolin and MOA51.
- To assess their effects on pain-related behaviors and spinal neuroinflammation.
Main Methods:
- Evaluation of Serodolin and MOA51 in inflammatory pain models (acetic acid writhing, formalin, CFA tests).
- Assessment in neuropathic pain models (spinal nerve injury, Cuff model).
- Analysis of tolerance development and spinal neuroinflammation markers.
Main Results:
- Both Serodolin and MOA51 significantly attenuated inflammatory pain responses.
- These ligands reversed mechanical allodynia in neuropathic pain models.
- Neither ligand induced tolerance, unlike pregabalin, and both reduced spinal microglial activity and neuronal hyperactivity.
Conclusions:
- Biased 5-HT7R ligands demonstrate significant analgesic potential.
- These ligands effectively modulate neuroinflammatory processes.
- Serodolin and MOA51 represent promising candidates for treating inflammatory and neuropathic pain.
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