Metabotropic glutamate receptor 5: a target for migraine therapy.

Abstract:

INTRODUCTION:Many patients suffering from migraine gain little relief from existing treatments partly because many existing acute and preventive therapies used in migraine have been adopted from other neurologic conditions such as depression or epilepsy. Here, we present data supporting a new migraine-specific target, the mGlu5 receptor. METHODS:We studied the effect of mGlu5 blockade using ADX10059, on neuronal firing in the trigeminocervical complex (TCC) and durovascular effects of nociceptive trigeminovascular activation in the anesthetized rat. The clinical potential of the mGlu5 mechanism was tested with ADX10059 orally in a double-blind placebo-controlled, parallel group, clinical trial. RESULTS:The negative allosteric mGlu5 modulator ADX10059 attenuated dural vasodilator responses to meningeal stimulation in a dose-dependent manner, comparable to naratriptan, while the N-methyl-d-aspartate receptor blocker MK-801 had no effect. ADX10059 reduced responses of trigeminocervical neurons to dural stimulation, most strikingly affecting their spontaneous firing rate. Immunostaining identified mGlu5 and not mGlu1a receptors in the TCC. The primary efficacy endpoint for the clinical trial, 2 h pain free, demonstrated a significant effect of ADX10059 375 mg, 17%, versus placebo, 5%. No serious adverse events were reported at the primary dose, with transient dizziness being the most common treatment-emergent event at 48%. INTERPRETATION:Our findings provide preclinical and clinical proof of concept establishing mGlu5 as a novel therapeutic target in the treatment of migraine. Although ADX10059 is unsuitable as a therapeutic candidate, because of hepatoxicity detected in a subsequent study, the data open a new direction for migraine research and therapy.

journal_name

Ann Clin Transl Neurol

authors

Waung MW,Akerman S,Wakefield M,Keywood C,Goadsby PJ

doi

10.1002/acn3.302

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

560-71

issue

8

issn

2328-9503

pii

ACN3302

journal_volume

3

pub_type

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