Paeonol and glycyrrhizic acid combination reduced CGRP levels and migraine symptoms in rats by activating the GABAergic synapse pathway and modulating the GABBR2/TRPM8/PRKACA/TRPV1 signaling cascade.
CGRP reducedvia upstream GABA pathway activation — paeonol and glycyrrhizic acid boost inhibitory neurotransmitters that suppress CGRP release in migraine
What the researchers found
PAE + GLY reduced CGRP levels and migraine symptoms by upregulating GAD2/GABBR2, increasing GABA, activating the GABBR2/TRPM8/PRKACA/TRPV1 pathway, and suppressing dural inflammation in a rat chronic migraine model.
Why it matters
CGRP is the central peptide target in modern migraine drugs (like erenumab and fremanezumab). Understanding how natural compounds reduce CGRP through upstream pathways could identify new drug targets and validate traditional migraine remedies.
The numbers in context
The combination treatment targeted GABBR2/TRPM8/PRKACA/TRPV1 pathway components in the nitroglycerin-induced migraine model.
How the study worked
Nitroglycerin-induced recurrent migraine rat model. Treated with paeonol + glycyrrhizic acid. Assessed behavioral tests, biomarkers (5-HT, histamine, CGRP), RNA-seq transcriptomics, RT-qPCR, Western blot, ELISA, and immunofluorescence.
Who was studied
Rats with nitroglycerin-induced recurrent migraine-like phenotype
What this study cannot tell us
Rat migraine model using nitroglycerin may not fully replicate human chronic migraine. Traditional medicine compounds are mixtures with variable composition. Specific contributions of each compound need further dissection. No comparison with established CGRP-targeting migraine drugs.
How to read the evidence
Preliminary evidence: well-designed rat study with comprehensive pathway analysis (RNA-seq + validation), but no human data and traditional medicine compounds have variable composition.
When this study was published
Published in 2024 in Journal of Ethnopharmacology. Links traditional medicine to modern CGRP migraine biology.
The bigger picture
Modern migraine treatment targets CGRP directly with antibodies or receptor blockers. This study reveals that upstream GABA modulation can reduce CGRP release, suggesting that enhancing GABAergic signaling could be an alternative or complementary approach to direct CGRP blockade for migraine prevention.
Questions still open
- Could GABA-enhancing drugs serve as an alternative to direct CGRP blockade for migraine?
- Would paeonol and glycyrrhizic acid show migraine benefits in human clinical trials?
- Is the CGRP reduction a direct effect of the GABAergic pathway activation or a downstream consequence of reduced inflammation?
Common questions
How do these plant compounds reduce CGRP?
Is this better than CGRP-blocking migraine drugs?
Read the original research
Paeonol and glycyrrhizic acid in combination ameliorate the recurrent nitroglycerin-induced migraine-like phenotype in rats by regulating the GABBR2/TRPM8/PRKACA/TRPV1 pathway.
Journal of ethnopharmacology, 334, 118464
Citation
Zhang, Yao; Ge, Fei; Luo, Yamin; Ji, Xuenian; Liu, Zijian; Qiu, Yuehua; Hou, Jianchen; Zhou, Ranran; Zhao, Caihong; Xu, Qianwei; Zhang, Shujing; Yu, Xue; Wang, Chunguo; Ge, Dongyu; Meng, Fengxian; Tao, Xiaohua. (2024). Paeonol and glycyrrhizic acid in combination ameliorate the recurrent nitroglycerin-induced migraine-like phenotype in rats by regulating the GABBR2/TRPM8/PRKACA/TRPV1 pathway.. Journal of ethnopharmacology, 334, 118464. https://doi.org/10.1016/j.jep.2024.118464