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Progressive Forms of Multiple Sclerosis: Distinct Entity or Age-Dependent Phenomena.

Burcu Zeydan1, Orhun H Kantarci2

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Summary

Multiple sclerosis (MS) progression is characterized by distinct phases, with the onset of the progressive phase being age-dependent. Pathologic hallmarks of progressive MS onset also appear age-dependent, marked by active smoldering plaques.

Keywords:
AgingMultiple sclerosisProgressionSmoldering plaque

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Area of Science:

  • Neurology
  • Immunology
  • Neuroscience

Background:

  • Multiple sclerosis (MS) exhibits a complex disease course with relapsing-remitting, progressive, and overlapping phases.
  • Periods of clinical and subclinical activity or inactivity occur within each phase.
  • Distinguishing between primary-progressive MS and secondary-progressive MS based on early subclinical activity is challenging.

Purpose of the Study:

  • To elucidate the temporal dynamics and age-dependency of multiple sclerosis disease course.
  • To identify key pathological features associated with the onset of progressive multiple sclerosis.
  • To understand the relationship between subclinical activity and the transition to progressive MS.

Main Methods:

  • Analysis of longitudinal clinical and radiological data in multiple sclerosis patients.
  • Characterization of pathological hallmarks during different disease phases.
  • Correlation of disease onset with age and pre-progressive phase characteristics.

Main Results:

  • The onset of the progressive phase in MS is age-dependent but independent of the time elapsed or the characteristics of the pre-progressive phase.
  • Pathological hallmarks observed at the onset of progressive MS are also age-dependent.
  • A peak in 'smoldering plaques' characterizes the onset of progressive MS.

Conclusions:

  • The age of the patient is a significant factor in the onset of progressive multiple sclerosis.
  • Specific pathological changes, including smoldering plaques, are key indicators of progressive MS onset and are linked to patient age.
  • Understanding these age-dependent factors may inform future therapeutic strategies for progressive MS.