Multiple sclerosis

Multiple Sclerosis (MS) is a chronic, irreversible, autoimmune and neurological disease that affects the central nervous system, including the brain and spinal cord. In multiple sclerosis the insulating covers of nerve cells in the brain and spinal cord are damaged. This damage disrupts the ability of parts of the nervous system to communicate, resulting in a range of signs and symptoms, including physical, mental, and sometimes psychiatric problems. Specific symptoms can include double vision, blindness in one eye, muscle weakness, trouble with sensation, or trouble with coordination. MS takes several forms, with new symptoms either occurring in isolated attacks (relapsing forms) or building up over time (progressive forms). Between attacks, symptoms may disappear completely; however, permanent neurological problems often remain, especially as the disease advances.

Prevalence
An estimated 2.3 million people worldwide have multiple sclerosis.

Risk factors
Latitude

Vitamin D

Epstein-Barr virus

Gender differences
Over the last decades, the ratio of women to men with MS has increased markedly, representing a true increase in MS among women but not men.

Immune system
In 1997, it was discovered that B cell therapy (eg Rituximab) which reduces the number of B cells, can bring immediate improvement in MS symptoms. This treatment is more effective for the relapsing-remitting variant of MS, and less effective for the primary progressive variant.

Microbiome
Specific changes in the gut microbiome might increase the risk of MS, and the risk might be reduced using probiotics, antibiotics, a combination, or a change of diet. An 'International Multiple Sclerosis Microbiome Study' commenced in 2015.

Experimental treatments
Another discovery was that a commonly available and inexpensive antihistamine, can be used to induce remyelination of the nerve cells.

Dietary tryptophan can help reduce brain inflammation and 'cognitive fog'.

Comparison of Multiple Sclerosis and ME/CFS
Multiple Sclerosis patients are sometimes used as a control group in ME/CFS research, for instance at the UK ME/CFS biobank.

There are many similar features in multiple sclerosis and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), including: severe disabling fatigue that worsens after exercise; debilitating autonomic symptoms, including orthostatic intolerance; illness course may be relapsing-remitting or progressive; infections and psychosocial stress causing exacerbation; auto-immunity and auto-inflammatory processes; mitochondrial dysfunction; and decreased cerebral blood flow, atrophy of some brain structures.

In the United States, the prevalence rate of chronic fatigue syndrome (CFS) is 0.42% of the population versus MS which has a rate of 0.09%. Approximately 14% of MS patients meet the Fukuda criteria for CFS.

In 2017, a study examined whether network analysis of cytokine production differed between patients with CFS, multiple sclerosis, and healthy controls. The study's model, using a select cytokine profile, showed that immunologic activation in CFS was significantly different from that found in the control and multiple sclerosis groups.

A 2015 study found a markedly disturbed immune signature in the cerebrospinal fluid that is consistent with immune activation in the central nervous system (CNS), and autoimmunity. The MS and ME/CFS groups had markedly different immune signatures, and the ME/CFS group had a greater degree of CNS immune activation than the MS group.

In December 2016, Ohanian, et al, published a study identifying two key immune symptoms that physicians could use to differentiate myalgic encephalomyelitis (ME) and CFS from MS: flu-like symptoms and tender lymph nodes. Subjects included 106 people with MS and 354 people with ME or CFS who completed the DePaul Symptom Questionnaire. The data was analyzed using data mining techniques and machine learning that resulted in correctly categorizing MS and ME or CFS 81.2% of the time. The authors conclude that "because ME or CFS and MS have similar presentations recognizing the importance of immune dysfunction for ME or CFS might be important for healthcare providers."

Notable studies comparing ME/CFS and multiple sclerosis

 * 2018, Functional Status and Well-Being in People with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Compared with People with Multiple Sclerosis and Healthy Controls (Full Text)
 * 2017, Differentiating Multiple Sclerosis from Myalgic Encephalomyelitis and Chronic Fatigue Syndrome (Full Text)
 * 2017, Dysregulation of cytokine pathways in chronic fatigue syndrome and multiple sclerosis (Abstract)
 * 2017, Endogenous Pain Facilitation Rather Than Inhibition Differs Between People with Chronic Fatigue Syndrome, Multiple Sclerosis, and Controls: An Observational Study (Full Text)
 * 2016, Identifying Key Symptoms Differentiating Myalgic Encephalomyelitis and Chronic Fatigue Syndrome from Multiple Sclerosis (Full Text)
 * 2016, Pilot Study of Natural Killer Cells in Chronic Fatigue Syndrome/Myalgic Encephalomyelitis and Multiple Sclerosis (Abstract)
 * 2016, Regulatory T, natural killer T and γδ T cells in multiple sclerosis and chronic fatigue syndrome/myalgic encephalomyelitis: a comparison (Full Text)
 * 2016, Cytokine network analysis of cerebrospinal fluid in myalgic encephalomyelitis/chronic fatigue syndrome (Abstract)
 * 2015, A Preliminary Comparative Assessment of the Role of CD8+ T Cells in Chronic Fatigue Syndrome/Myalgic Encephalomyelitis and Multiple Sclerosis (Full Text)
 * 2015, A Comparison of Cytokine Profiles of Chronic Fatigue Syndrome/Myalgic Encephalomyelitis and Multiple Sclerosis Patients (Full Text)
 * 2013, Myalgic encephalomyelitis/chronic fatigue syndrome and encephalomyelitis disseminata/multiple sclerosis show remarkable levels of similarity in phenomenology and neuroimmune characteristics (Full Text)
 * 2012, Differences in metabolite-detecting, adrenergic, and immune gene expression after moderate exercise in patients with chronic fatigue syndrome, patients with multiple sclerosis, and healthy controls. (Full Text)

Other studies

 * 2015, HIV and lower risk of multiple sclerosis: beginning to unravel a mystery using a record-linked database study. (Abstract)

Learn more

 * Wikipedia - Multiple Sclerosis