Novel KV7 ion channel openers for the treatment of epilepsy and implications for detrusor tissue contraction
作者:Mark A. Seefeld、Hong Lin、Joerg Holenz、Dave Downie、Brian Donovan、Tingting Fu、Kishore Pasikanti、Wei Zhen、Matthew Cato、Khuram W. Chaudhary、Pat Brady、Tania Bakshi、Dwight Morrow、Sridharan Rajagopal、Swapan Kumar Samanta、Naveena Madhyastha、Bharathi Mohan Kuppusamy、Robert W. Dougherty、Ravi Bhamidipati、Zainuddin Mohd、Guy A. Higgins、Mark Chapman、Céline Rouget、Philippe Lluel、Yasuji Matsuoka
DOI:10.1016/j.bmcl.2018.09.036
日期:2018.12
Neuronal voltage-gated potassium channels, K(v)7s, are the molecular mediators of the M current and regulate membrane excitability in the central and peripheral neuronal systems. Herein, we report novel small molecule K(v)7 openers that demonstrate anti-seizure activities in electroshock and pentylenetetrazol-induced seizure models without influencing Rotarod readouts in mice. The anti-seizure activity was determined to be proportional to the unbound concentration in the brain. K(v)7 channels are also expressed in the bladder smooth muscle (detrusor) and activation of these channels may cause localized undesired effects. Therefore, the impact of individual K(v)7 isoforms was investigated in human detrusor tissue using a panel of K(v)7 openers with distinct activity profiles among K(v)7 isoforms. KCNQ4 and KCNQ5 mRNA were highly expressed in detrusor tissue, yet a compound that has significantly reduced activity on homomeric K(v)7.4 did not reduce detrusor contraction. This may suggest that the homomeric K(v)7.4 channel plays a less significant role in bladder contraction and further investigation is needed.