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Neurogenesis and Regeneration of Nervous Tissue01:15

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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Older adults (40-50) with a first demyelinating event in multiple sclerosis (MS) show less inflammation but higher neurodegeneration risk. This highlights age as a crucial factor in MS progression and disability.

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Area of Science:

  • Neurology
  • Neuroimmunology
  • Clinical Research

Background:

  • Disability accumulation in multiple sclerosis (MS) can begin early.
  • Aging is a significant factor in MS progression and disability.
  • Early detection of MS progression is crucial for management.

Purpose of the Study:

  • To investigate the prognostic impact of age at first demyelinating event (FDE) on MS progression.
  • To analyze various disability outcomes in different age groups.
  • To assess age-specific differences in inflammatory and neurodegenerative markers.

Main Methods:

  • Prospective cohort study of 1,170 patients aged 18-50 years since 1994.
  • Categorization into three age groups: 18-29, 30-39, and 40-50 years.
  • Comparison of relapse-associated worsening, relapse rates, EDSS trajectories, and Cox regression analyses for multiple outcomes including PIRA and CDA.

Main Results:

  • The 40-50 age group had higher relapse-associated worsening at FDE and greater annual EDSS increase.
  • This older group showed lower risk for inflammatory outcomes (relapses, new lesions) but higher risk for confirmed disability accumulation (CDA) and progression independent of relapse activity (PIRA).
  • Patient-reported outcomes related to function and well-being were more affected in the 40-50 group.

Conclusions:

  • Patients experiencing FDE at 40-50 years present with less inflammatory disease activity compared to younger individuals.
  • Despite lower inflammatory markers, older patients face a higher risk of neurodegenerative outcomes.
  • Age is a critical determinant of MS disease course and disability accrual.