RT Journal Article
SR Electronic
T1 VSN16R – A NOVEL TREATMENT FOR SPASTICITY IN EXPERIMENTAL MULTIPLE SCLEROSIS
JF Journal of Neurology, Neurosurgery & Psychiatry
JO J Neurol Neurosurg Psychiatry
FD BMJ Publishing Group Ltd
SP e1
OP e1
DO 10.1136/jnnp-2016-315106.162
VO 87
IS 12
A1 Thomas Williams
A1 Gareth Pryce
A1 Gavin Giovannoni
A1 David Selwood
A1 David Baker
YR 2016
UL http://jnnp.bmj.com/content/87/12/e1.71.abstract
AB Current symptomatic treatments for spasticity in multiple sclerosis often exhibit intolerable side-effects that limit their use. We synthesized a novel compound, VSN16R, which exhibited anti-spastic activity in experimental autoimmune encephalomyelitis (EAE) in mice and was as active as baclofen and cannabinoids but lacked their sedative side-effects. The drug was found to be a novel, potent BKCa calcium activated potassium channel modulator in vitro. VSN16R was orally active and remarkably well-tolerated, with over a thousand fold therapeutic window, and demonstrated no obvious adverse neurobehavioural effects in mice. It was also well tolerated in other larger animal species and importantly in humans, where phase 1 studies found VSN16R to produced high oral bioavailability and no serious adverse behavioural or physiological events at supra-therapeutic plasma concentrations. VSN16R has the potential to inhibit pathogenic spinal cord hyperreflexia and can drive neuronal potassium-induced hyperpolarisation to limit spasticity via BKCa opening. This study identifies a novel target for control of spasticity and suggests that VSN16R may be a useful novel therapeutic, which offers tolerability advantages over existing treatments. This may facilitate adoption of earlier treatment following to development of spasticity in MS. A phase II clinical trial (NCT02542787) is currently in progress.