The H current blocker ZD7288 (cas 133059-99-1) decreases epileptiform hyperexcitability in the rat neocortex by depressing synaptic transmission

Add time:09/07/2019    Source:sciencedirect.com

Neurons respond to intracellular injection of hyperpolarizing current pulses by generating depolarizing sags contributed by a cation current termed Ih. Ih modulates neuron excitability and rhythmicity. It is, however, unclear whether the net effect of changing Ih leads to facilitation or depression of cortical epileptiform activity. Here, we addressed this issue by using field and intracellular recordings to study the effects of ZD7288 (cas 133059-99-1) (10–100 μM), a bradycardic agent known to abolish Ih, on the epileptiform discharges (duration = 2.5 ± 0.3 s, mean ± SEM; interval of occurrence = 34.2 ± 3.3 s, n = 30 slices) induced in rat neocortical slices by 4-aminopyridine and GABA receptor antagonists. ZD7288 abolished the depolarizing sags seen during injection of intracellular hyperpolarizing current pulses while increasing resting membrane potential and apparent input resistance. These effects, which were fully established with 10 μM ZD7288, were associated with a dose-dependent decrease in the occurrence of spontaneous epileptiform events and a reduction in their duration (the latter change occurring at doses >20 μM). ZD7288 also caused a dose-dependent decrease of background postsynaptic potentials. Finally, ZD7288 could depress epileptiform activity during Cs+ pre-treatment, a procedure known to block Ih. These data indicate that ZD7288 hampers neocortical epileptiform synchronization, but also suggest that most of this action reflects the ability of ZD7288 to decrease synaptic transmission.

We also recommend Trading Suppliers and Manufacturers of ZD7288 (cas 133059-99-1). Pls Click Website Link as below: cas 133059-99-1 suppliers

Prev:ZD7288 (cas 133059-99-1) inhibits low-threshold Ca2+ channel activity and regulates sperm function
Next:Neuropharmacology and AnalgesiaZD7288 (cas 133059-99-1)-induced suppression of long-term potentiation was attenuated by exogenous NMDA at the Schaffer collateral–CA1 synapse in the rat in vivo)