Antiepileptic effects of two Rho-kinase inhibitors, Y-27632 and fasudil, in mice
Version of Record online: 29 JAN 2009
2008 British Pharmacological Society
British Journal of Pharmacology
Volume 155, Issue 1, pages 44–51, September 2008
How to Cite
İnan, S. Y. and Büyükafşar, K. (2008), Antiepileptic effects of two Rho-kinase inhibitors, Y-27632 and fasudil, in mice. British Journal of Pharmacology, 155: 44–51. doi: 10.1038/bjp.2008.225
- Issue online: 29 JAN 2009
- Version of Record online: 29 JAN 2009
- (Received February 8, 2008, Revised March 26, 2008, Accepted April 30, 2008)
- Rho/Rho-kinase signalling;
Background and purpose:
Rho/Rho-kinase signalling is involved in many cellular events, including some in the CNS. However, the role of this pathway in epilepsy has not yet been assessed. Therefore, we determined the effects of two Rho-kinase inhibitors, Y-27632 and fasudil, on seizures induced by pentylenetetrazole (PTZ) or maximal electroconvulsive shock (MES).
Effects of Y-27632 (5–10 mg kg−1) and fasudil (5–25 mg kg−1) on duration of myoclonic jerks, clonic and tonic convulsions, tonic hindlimb extensions and percentage of tonic convulsion index, as well as recovery latency for righting reflex were investigated in mice stimulated with PTZ (65 mg kg−1) or MES (50 Hz, 50 mA and 0.4 s). These inhibitors were also tested on a model of kindling induced by PTZ (35 mg kg−1, for 11 days). Membrane and cytosolic levels of RhoA protein were measured in brain homogenates from kindled mice.
Y-27632 and fasudil diminished onset of myoclonic jerks, clonic convulsions and tonic hindlimb extensions in mice given PTZ. These inhibitors suppressed the percentage of tonic convulsion index and recovery latency for righting reflex in the mice excited with MES. Western blotting demonstrated that Rho translocation to plasma membrane increased in the brain homogenates obtained from PTZ-kindled mice. However, the Rho-kinase inhibitors at the given doses did not change motor coordination of the mice.
Conclusions and implications:
Rho/Rho-kinase signalling may play a role in epilepsy induced by PTZ and MES. Furthermore, Rho-kinase inhibitors could be novel important antiepileptic agents.
British Journal of Pharmacology (2008) 155, 44–51; doi:10.1038/bjp.2008.225; published online 9 June 2008