Ether-A-Go-Go Potassium Channels 1 HEK293 Cells 1 HEK293 cell line 1 HSP90 Heat-Shock Proteins 1 Humans 1 KCNH1 protein, human 1 Membrane Potentials 1 Multiprotein Complexes Rauwolfia alkaloid 1 Secologanin Tryptamine Alkaloids 1 Up-Regulation 1 drug effect 1 heat shock protein 90 1 human 1 membrane potential 1 metabolism 1 mitragynine 1 multiprotein complex 1 potassium channel HERG 1 upregulation 1