Biomaterial Database

Effects of tetrandrine on action potentials and afterhyperpolarization potentials in toad dorsal root ganglia. 1992

W Z Zeng, and T P Liu

Department of Pharmacology, Nanjing Medical College, China.

Intracellular recordings were obtained from the cytosome of type A primary afferents in the isolated toad dorsal root ganglia (DRG) preparations. Bath application of Ca2+ 8.0 mmol.L-1 led to prolong action potential duration of repolarization 100% (APD100) by 23%, afterhyperpolarization potential duration of depolarization 50% (AHPD50) by 46%, and increase afterhyperpolarization potential amplitude (AHPA) by 40%. Verapamil 3 mumol.L-1 shortened the APD100 by 7% and the AHPD50 by 13%, and reduced the AHPA by 17%. The effects of Tet 3-100 mumol.L-1 consisted of APD and AHPD50 shortening and AHPA reduction in concentration-dependent manner. Tet 100 mumol.L-1, APD100 was shortened by 16%, AHPD50 by 18%, and AHPA was reduced by 20%. The results suggested that the effects of Tet may be related to its Ca2+ channel blockade in DRG.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D002023	Bufo bufo	A species of the true toads, Bufonidae, widely distributed in the United States and Europe.	Toad, Common,Common Toad,Common Toads,Toads, Common
D002121	Calcium Channel Blockers	A class of drugs that act by selective inhibition of calcium influx through cellular membranes.	Calcium Antagonists, Exogenous,Calcium Blockaders, Exogenous,Calcium Channel Antagonist,Calcium Channel Blocker,Calcium Channel Blocking Drug,Calcium Inhibitors, Exogenous,Channel Blockers, Calcium,Exogenous Calcium Blockader,Exogenous Calcium Inhibitor,Calcium Channel Antagonists,Calcium Channel Blocking Drugs,Exogenous Calcium Antagonists,Exogenous Calcium Blockaders,Exogenous Calcium Inhibitors,Antagonist, Calcium Channel,Antagonists, Calcium Channel,Antagonists, Exogenous Calcium,Blockader, Exogenous Calcium,Blocker, Calcium Channel,Blockers, Calcium Channel,Calcium Blockader, Exogenous,Calcium Inhibitor, Exogenous,Channel Antagonist, Calcium,Channel Blocker, Calcium,Inhibitor, Exogenous Calcium
D002122	Calcium Chloride	A salt used to replenish calcium levels, as an acid-producing diuretic, and as an antidote for magnesium poisoning.	Calcium Chloride Dihydrate,Calcium Chloride, Anhydrous
D005260	Female		Females
D005727	Ganglia, Spinal	Sensory ganglia located on the dorsal spinal roots within the vertebral column. The spinal ganglion cells are pseudounipolar. The single primary branch bifurcates sending a peripheral process to carry sensory information from the periphery and a central branch which relays that information to the spinal cord or brain.	Dorsal Root Ganglia,Spinal Ganglia,Dorsal Root Ganglion,Ganglion, Spinal,Ganglia, Dorsal Root,Ganglion, Dorsal Root,Spinal Ganglion
D000200	Action Potentials	Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.	Spike Potentials,Nerve Impulses,Action Potential,Impulse, Nerve,Impulses, Nerve,Nerve Impulse,Potential, Action,Potential, Spike,Potentials, Action,Potentials, Spike,Spike Potential
D000470	Alkaloids	Organic nitrogenous bases. Many alkaloids of medical importance occur in the animal and vegetable kingdoms, and some have been synthesized. (Grant & Hackh's Chemical Dictionary, 5th ed)	Alkaloid,Plant Alkaloid,Plant Alkaloids,Alkaloid, Plant,Alkaloids, Plant
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D014700	Verapamil	A calcium channel blocker that is a class IV anti-arrhythmia agent.	Iproveratril,Calan,Cordilox,Dexverapamil,Falicard,Finoptin,Isoptin,Isoptine,Izoptin,Lekoptin,Verapamil Hydrochloride,Hydrochloride, Verapamil