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Significantly increased fractions of transformed to total alpha2-macroglobulin concentrations in plasma from patients

Poul Erik H Jensen1, Signe Humle Jørgensen, Pameli Datta

  • 1The Neuroimmunology Laboratory, Section 9302, MS Research Unit, Copenhagen University Hospital, Juliane Mariesvej 20, 2100 Copenhagen, Denmark. pejensen@nru.dk

Biochimica Et Biophysica Acta
|October 30, 2004
PubMed

Insights

Multiple sclerosis (MS) patients show altered levels of alpha2-macroglobulin (alpha2M), a key proteinase inhibitor. Lower native alpha2M and higher transformed alpha2M suggest its role in MS-related proteolytic activity.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Immunology

Background:

  • Multiple sclerosis (MS) is a central nervous system disease characterized by inflammation and neurodegeneration.
  • Proteinase inhibitors, such as alpha2-macroglobulin (alpha2M), play a role in regulating proteolytic activity.
  • Aberrant proteolytic activity is implicated in the pathogenesis of MS.

Purpose of the Study:

  • To investigate the concentrations of native and transformed alpha2-macroglobulin (alpha2M) in the plasma of patients with multiple sclerosis (MS).
  • To determine if alpha2M levels correlate with MS disease status or activity.
  • To explore the potential involvement of alpha2M in the proteolytic dysregulation associated with MS.

Main Methods:

  • Plasma samples were collected from 90 patients diagnosed with clinically definite MS (73 relapsing-remitting, 17 secondary progressive) and 132 healthy controls.
  • Concentrations of native and transformed alpha2-macroglobulin (alpha2M) were quantified using established biochemical assays.
  • Statistical analyses were performed to compare alpha2M levels between MS patients and healthy individuals and to assess correlations.

Main Results:

  • MS patients exhibited significantly lower concentrations of native alpha2M compared to healthy controls.
  • Conversely, MS patients showed significantly higher concentrations of transformed alpha2M.
  • A significant correlation was observed between native and transformed alpha2M levels in MS patients, with the transformed fraction being 36% higher overall.

Conclusions:

  • The study indicates a significant alteration in alpha2-macroglobulin (alpha2M) homeostasis in multiple sclerosis (MS) patients.
  • Elevated levels of transformed alpha2M and reduced native alpha2M suggest an active role for alpha2M in MS pathogenesis.
  • These findings highlight the involvement of alpha2M in regulating the increased proteolytic activity observed in MS disease.

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