Promising Changes in the Landscape of MS Treatments
Multiple sclerosis (MS) is a chronic disease that affects the central nervous system. Nerves are coated in a protective covering called myelin, which also speeds up the transmission of nerve signals. People with MS experience inflammation of areas of myelin and progressive deterioration and loss of myelin.
Nerves may function abnormally when myelin is damaged. This can cause a number of unpredictable symptoms. These include:
- pain, tingling, or burning sensations throughout the body
- vision loss
- mobility difficulties
- muscle spasms or stiffness
- difficulty with balance
- slurred speech
- impaired memory and cognitive function
Years of dedicated research have led to new treatments for MS. There is still no cure for the disease, but drug regimens and behavioral therapy allow people with MS to enjoy a better quality of life.
Purpose of treatments
Many treatment options can help manage the course and symptoms of this chronic disease. Treatment can help:
- slow the progression of MS
- minimize symptoms during MS exacerbations or flare-ups
- improve physical and mental function
Treatment in the form of support groups or talk therapy can also provide much-needed emotional support.
Anyone who is diagnosed with a relapsing form of MS will most likely begin treatment with an FDA-approved disease-modifying drug. This includes individuals who experience a first clinical event consistent with MS. Treatment with a disease-modifying drug should continue indefinitely unless the patient has a poor response, experiences intolerable side effects, or doesn’t take the drug as they should. Treatment should also change if a better option becomes available.
In 2010, Gilenya became the first oral drug for relapsing types of MS to be approved by the Food and Drug Administration (FDA). Reports show that it may reduce relapses by half and slow the progression of the disease.
A main goal of MS treatment is to slow down the progression of the disease. Drugs that do this are called disease-modifying medications. One such medication is the oral drug teriflunomide (Aubagio). It was approved for use in people with MS in 2012.
A study published in The New England Journal of Medicine found that people with relapsing MS who took teriflunomide once a day showed significantly slower disease progression rates and fewer relapses than those who took a placebo. People given the higher dose of teriflunomide (14 mg vs. 7 mg) experienced decreased disease progression. Teriflunomide was only the second oral disease-modifying medication approved for MS treatment.
Dimethyl fumarate (Tecfidera)
A third oral disease-modifying drug became available to people with MS in March of 2013. Dimethyl fumarate (Tecfidera) was formerly known as BG-12. It stops the immune system from attacking itself and destroying myelin. It may also have a protective effect on the body, similar to the effect that antioxidants have. The medication is available in capsule form.
Dimethyl fumarate is designed for people who have relapsing-remitting MS (RRMS). RRMS is a form of the disease in which a person typically goes into remission for a period of time before their symptoms worsen. People with this type of MS can benefit from twice-daily doses of this medication.
MS-induced myelin destruction affects the way nerves send and receive signals. This can affect movement and mobility. Potassium channels are like pores on the surface of nerve fibers. Blocking the channels can improve the nerve conduction in affected nerves.
Dalfampridine (Ampyra) is a potassium channel blocker. Studies published in The Lancet found that dalfampridine (formerly called fampridine) increased walking speed in people with MS. The original study tested walking speed during a 25-foot walk. It didn’t show dalfampridine to be beneficial. However, post-study analysis revealed that participants showed increased walking speed during a six-minute test when taking 10 mg of the medication daily. Participants who experienced increased walking speed also demonstrated improved leg muscle strength.
Alemtuzumab (Lemtrada) is a humanized monoclonal antibody (lab produced protein that destroys cancer cells). It’s another disease-modifying agent approved to treat relapsing forms of MS. It targets a protein called CD52 that’s found on the surface of the immune cells. Though it’s not known exactly how alemtuzumab works, it’s believed to bind to CD52 on T and B lymphocytes (white blood cells) and cause lysis (breakdown of the cell). The drug was first approved to treat leukemia at a much higher dosage.