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Multiple Sclerosis l: Introduction01:19

Multiple Sclerosis l: Introduction

Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...

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Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
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Chromosomal radiosensitivity in patients with multiple sclerosis.

Maria Milenkova1, Ivan Milanov, Ksenia Kmetska

  • 1III Neurological Clinic, University Hospital Saint Naum, Sofia, Bulgaria.

Mutation Research
|September 3, 2013
PubMed
Summary

Multiple sclerosis patients show reduced DNA damage response in lymphocytes compared to healthy individuals. Treated relapsing-remitting multiple sclerosis patients exhibit significantly lower radiation-induced DNA damage, suggesting treatment-induced lymphocyte sensitivity.

Keywords:
Interferon βLymphocytes radiosensitivityMicronucleiMultiple sclerosis

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Published on: July 3, 2015

Area of Science:

  • Immunology
  • Genetics
  • Neurology

Background:

  • Multiple sclerosis (MS) is a complex autoimmune disease causing significant neurological impairment.
  • Available disease-modifying therapies for MS have unclear mechanisms of action.
  • Understanding lymphocyte radiosensitivity in MS is crucial for treatment evaluation.

Purpose of the Study:

  • To investigate radiosensitivity in lymphocytes of patients with relapsing-remitting MS (RRMS) and secondary progressive MS (SPMS) compared to healthy controls.
  • To assess spontaneous and radiation-induced DNA damage (micronuclei formation) in lymphocytes.
  • To explore the impact of immunomodulatory treatments (interferon-β, glatiramer acetate) on lymphocyte radiosensitivity in RRMS patients.

Main Methods:

  • Whole blood cultures from MS patients (RRMS, SPMS) and healthy controls were analyzed.
  • Micronuclei formation in binucleated lymphocytes was measured to assess spontaneous and gamma-irradiation-induced DNA damage.
  • A subgroup of RRMS patients receiving interferon-β or glatiramer acetate was compared with untreated RRMS patients and healthy controls.

Main Results:

  • Basal DNA damage levels were comparable across RRMS, SPMS patients, and healthy controls.
  • No significant differences in gamma-irradiation-induced micronuclei frequencies were observed between MS patient subtypes and healthy controls.
  • A reduction in radiation-induced DNA damage was noted in the overall MS patient group compared to healthy controls.
  • Treated RRMS patients showed significantly lower induced micronuclei frequencies than both healthy controls and untreated RRMS patients.

Conclusions:

  • Lymphocyte radiosensitivity may be altered in multiple sclerosis patients.
  • Immunomodulatory treatments in RRMS appear to enhance lymphocyte sensitivity to radiation-induced DNA damage, possibly via apoptosis.
  • These findings suggest a potential mechanism for treatment efficacy and highlight the need for further investigation into lymphocyte subpopulations' responses.