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'Holy Grail' drug discovery to prevent disability in multiple sclerosis

'Holy Grail' drug discovery to prevent disability in multiple sclerosis

6 August 2020
Image: Wengang Zhai

A research programme spanning over a decade has discovered a 'Holy Grail' molecular target to protect nerves from damage in multiple sclerosis (MS).

The paper, published in Acta Neuropathologica, also suggests a common diabetes drug could help enhance this new-found natural mechanism – and prevent disability progression in the neurological condition.

In MS the protective coating that surrounds nerves, known as myelin, is damaged and nerves become less energy efficient as a result. Not having the energy they need makes nerves vulnerable to further damage and causes disability over time.

But for the first time researchers at the University of Edinburgh – funded in part by the MS Society – have discovered a natural mechanism in the body that tackles this issue, which they are calling ARMD (axonal response of mitochondria to demyelination).

Although this natural function alone doesn’t provide enough energy to address demyelination in MS, the discovery raised the possibility of using a drug to enhance it. Further research in animal models now suggests pioglitazone – currently used to treat diabetes – could be the answer.

Dr Don Mahad, Lead Author and Senior Clinical Lecturer at the University of Edinburgh, said: “Disability in MS is caused by a loss of nerve fibres following damage to the myelin that protects them. Although our understanding of MS has vastly improved over the last two decades, new therapies still do not protect nerve fibres. Such protection is the Holy Grail in MS treatment – not only for the relapsing form of MS, which has various options available, but for progressive forms too, where treatment continues to lag behind.

“Our discovery shows that nerves respond to myelin damage by increasing the movement of mitochondria (the cell powerhouse, which produces energy) to the area of damage – a response we’re calling ‘ARMD’. Remarkably, we were able to enhance ARMD and protect these vulnerable nerves using the readily available diabetes drug pioglitazone. This is an incredibly important discovery – one we believe could finally bridge the gap in MS treatment.”

Over the last few decades there have been huge strides made in our understanding of MS, and there are now over a dozen effective treatments for people with relapsing MS – but these only address damage that is caused by the immune system. In order to truly stop MS and find treatments for everyone, we need to find ways to both protect nerves from further injury and repair damaged myelin.

Last year, another MS Society funded study found that a different diabetes drug – the fasting mimetic drug metformin – was able to return cells to a more youthful state, and encourage the re-growth of myelin. Led by Professor Robin Franklin, the study found metformin could reverse changes that happen to cells responsible for making myelin as they age, and restore their regenerative capacity.

MS Society Assistant Director of Research, Dr Emma Gray, said: “This represents another important stride towards our goal of stopping MS – and we believe that MS treatment could in the near future look completely different. People with MS will be prescribed a combination of therapies that work on every aspect of the condition: stopping immune attacks and relapses, protecting nerves from damage, and regenerating lost myelin. It will mean no-one needs to worry about their MS getting worse.

“Currently, there are no effective neuroprotective therapies available for MS, but Dr Mahad’s research demonstrates we are getting closer – and finding treatments for everyone with MS is now a very real prospect.”

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