The majority of autoimmune disorders like cancers are progressive and fatal. The exceptions seem to be only autoimmune demyelinating disorders and its most common type, Multiple Sclerosis (MS) that in majority of cases have a relapsing-remitting course and a better prognosis. Although MS at the onset could manifest as a clinically isolated syndrome, it soon takes the form of either relapsing-remitting or progressive (primary). Later on in the course of illness a minority of the relapsing-remitting MS (RRMS) may change its course to progressive and poor prognosis and this group is classified secondary progressive MS (SPMS) against the primary progressive MS (PPMS) that has a progressive course from the onset (1)
Unfortunately it has not yet been sufficiently questioned and studied why MS and other similar autoimmune demyelinating disorders possess could have a relapsing-remitting course and a better prognosis, while the nature of autoimmune disorders are generally progressive with morbidity and mortality. Autoimmune disorders that like cancers as detailed in other articles on this site are the results of microbial invasions, and no microbes such as bacteria or viruses invade our beings to fool around, remit and relapse. So then why if autoimmune demyelinating disorders such as MS are also the byproducts of microbial invasions such as EBV (Epstein Barr Virus), have a remission and relapse course while the invasion targets our most precious organ, the brain. In fact the answer when probe to it well lies in our brain, not the invaders. It’s the brain that protects itself and fights back against the invasion and strives to undo the damage. This interesting fact that so far seems to happen only in the brain and at least to the myelin sheaths of the brain is a very new discovery in the very recent years. But this has not yet been applied in the explanation of the relapsing-remitting course of autoimmune demyelinating disorders such as MS, and this article could be the first.
The Brain fights back:
While the great majority of brain cells are essentially stable throughout life, oligodendrocyte precursor cells (OPCs) that generate new oligodendrocytes hence new myelin sheaths have been observed widespread in the brain even in adult life (2). The myelin or myelin sheaths that cover the nerve cell axons act as the nervous system wires for the conduction of information from one neuron to the other, or one area of the brain to the other. The white matters or the highways of the brain are basically made of the myelin and myelin sheaths that are the targets of microbial invasions in the autoimmune demyelinating disorders such as MS. Generally the process of myelination or the generation of myelin and myelin sheaths that start early in the third trimester, continues throughout adolescence and early adult life that contribute and correspond to the continuation of the general brain development until mid-20s (3). The reason or need for the long development of the brain through ongoing myelination is building its widespread communication infrastructures for learning, skills developments and other higher cortical functions that create cognitive and skills maturity.
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