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The Probable Infectious Origin of Multiple Sclerosis
Remi L Landry1,2, Monica E Embers1,2
1Department of Tropical Medicine, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA 70112, USA; rlandry10@tulane.edu.
Abstract:
Multiple sclerosis (MS) is an immune inflammatory disease that causes demyelination of the white matter of the central nervous system. It is generally accepted that the etiology of MS is multifactorial and believed to be a complex interplay between genetic susceptibility, environmental factors, and infectious agents. While the exact cause of MS is still unknown, increasing evidence suggests that disease development is the result of interactions between genetically susceptible individuals and the environment that lead to immune dysregulation and CNS inflammation. Genetic factors are not sufficient on their own to cause MS, and environmental factors such as viral infections, smoking, and vitamin D deficiency also play important roles in disease development. Several pathogens have been implicated in the etiology of MS, including Epstein-Barr virus, human herpesvirus 6, varicella-zoster virus, cytomegalovirus, Helicobacter pylori, Chlamydia pneumoniae, and Borrelia burgdorferi. Although vastly different, viruses and bacteria can manipulate host gene expression, causing immune dysregulation, myelin destruction, and neuroinflammation. This review emphasizes the pathogenic triggers that should be considered in MS progression.
Insights
Multiple sclerosis (MS) is an immune inflammatory disease. Its cause involves genetic susceptibility, environmental factors like infections, and immune dysregulation leading to central nervous system inflammation.
Area of Science:
- Neuroimmunology
- Infectious Disease Epidemiology
Background:
- Multiple sclerosis (MS) is a chronic immune-mediated inflammatory disease targeting the central nervous system's white matter.
- The etiology of MS is multifactorial, involving a complex interplay of genetic predisposition, environmental influences, and infectious agents.
Purpose of the Study:
- To review and emphasize the pathogenic triggers implicated in the development and progression of multiple sclerosis.
- To highlight the role of infectious agents in initiating immune dysregulation and neuroinflammation characteristic of MS.
Main Methods:
- Literature review of studies investigating the causes and triggers of multiple sclerosis.
- Analysis of evidence linking genetic susceptibility, environmental factors (viral, bacterial infections, vitamin D deficiency, smoking), and MS pathogenesis.
Main Results:
- Genetic factors alone are insufficient to cause MS; environmental factors are crucial.
- Several pathogens, including Epstein-Barr virus, human herpesvirus 6, and *Chlamydia pneumoniae*, are implicated in MS etiology.
- Both viral and bacterial pathogens can manipulate host gene expression, leading to immune dysregulation, myelin damage, and neuroinflammation.
Conclusions:
- The development of MS results from interactions between susceptible individuals and environmental triggers.
- Understanding these pathogenic triggers is essential for comprehending and potentially managing MS progression.
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