Multiple Sclerosis: Hope Through Research: National Institute of …
Posted: November 1, 2013 at 6:40 pm
Multiple Sclerosis (MS) is the most common disabling neurological disease of young adults. It most often appears when people are between 20 to 40 years old. However, it can also affect children and older people.
The course of MS is unpredictable. A small number of those with MS will have a mild course with little to no disability, while another smaller group will have a steadily worsening disease that leads to increased disability over time. Most people with MS, however, will have short periods of symptoms followed by long stretches of relative relief, with partial or full recovery. There is no way to predict, at the beginning, how an individual persons disease will progress.
Researchers have spent decades trying to understand why some people get MS and others don't, and why some individuals with MS have symptoms that progress rapidly while others do not. How does the disease begin? Why is the course of MS so different from person to person? Is there anything we can do to prevent it? Can it be cured?
This brochure includes information about why MS develops, how it progresses, and what new therapies are being used to treat its symptoms and slow its progression. New treatments can reduce long-term disability for many people with MS. However, there are still no cures and no clear ways to prevent MS from developing.
Multiple sclerosis (MS) is a neuroinflammatory disease that affects myelin , a substance that makes up the membrane (called the myelin sheath) that wraps around nerve fibers (axons). Myelinated axons are commonly called white matter. Researchers have learned that MS also damages the nerve cell bodies, which are found in the brains gray matter, as well as the axons themselves in the brain, spinal cord, and optic nerve (the nerve that transmits visual information from the eye to the brain). As the disease progresses, the brains cortex shrinks (cortical atrophy).
The term multiple sclerosis refers to the distinctive areas of scar tissue (sclerosis or plaques) that are visible in the white matter of people who have MS. Plaques can be as small as a pinhead or as large as the size of a golf ball. Doctors can see these areas by examining the brain and spinal cord using a type of brain scan called magnetic resonance imaging (MRI).
While MS sometimes causes severe disability, it is only rarely fatal and most people with MS have a normal life expectancy.
Plaques, or lesions, are the result of an inflammatory process in the brain that causes immune system cells to attack myelin. The myelin sheath helps to speed nerve impulses traveling within the nervous system. Axons are also damaged in MS, although not as extensively, or as early in the disease, as myelin.
Under normal circumstances, cells of the immune system travel in and out of the brain patrolling for infectious agents (viruses, for example) or unhealthy cells. This is called the "surveillance" function of the immune system.
Surveillance cells usually won't spring into action unless they recognize an infectious agent or unhealthy cells. When they do, they produce substances to stop the infectious agent. If they encounter unhealthy cells, they either kill them directly or clean out the dying area and produce substances that promote healing and repair among the cells that are left.
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Multiple Sclerosis: Hope Through Research: National Institute of ...
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