Study just published in the Journal of Ethnopharmacology
Effects of Gelsemium sempervirens L. on pathway-focused gene expression profiling in neuronal cells.
RESULTS: Exposure to the Gelsemium sempervirens 2c dilution, containing a nanomolar concentration of active principle gelsemine, induced a down-regulation of most genes of this array. In particular, the treated cells showed a statistically significant decrease of the prokineticin receptor 2, whose ligand is a neuropeptide involved in nociception, anxiety and depression-like behavior.
CONCLUSIONS: Overall, the results indicate a negative modulation trend in neuronal excitatory signaling, which can suggest new working hypotheses on the anxiolytic and analgesic action of this plant.
(taken from http://www.ncbi.nlm.nih.gov/m/pubmed/24613275/)