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Increased cellular expression of the caspase inhibitor FLIP in intrathecal lymphocytes from patients with multiple

M K Sharief1

  • 1Department of Neuroimmunology, Guy's, King's and St. Thomas' School of Medicine, Hodgkin Building, Guy's Hospital, SE1 9RT, London, UK. m.sharief@umds.ac.uk

Journal of Neuroimmunology
|November 7, 2000
PubMed

Insights

In multiple sclerosis, T lymphocytes resist apoptosis due to increased FLIP protein, a caspase-antagonist. This FLIP overexpression, observed in spinal fluid cells, hinders programmed cell death, potentially contributing to disease pathogenesis.

Area of Science:

  • Immunology
  • Neuroscience
  • Cell Biology

Background:

  • Multiple sclerosis pathogenesis may involve the failure of T lymphocytes to undergo apoptosis.
  • The Fas signalling pathway is crucial for inducing apoptosis in activated lymphocytes.
  • FLIP (FLICE-inhibitory protein) is an intracellular protein that antagonizes caspases and inhibits Fas-mediated apoptosis.

Purpose of the Study:

  • To investigate the expression levels of FLIP in lymphocytes from patients with multiple sclerosis.
  • To determine if FLIP overexpression correlates with Fas receptor or Bcl-2 expression in these patients.

Main Methods:

  • Analysis of FLIP (long and short forms) expression in intrathecal lymphocytes.
  • Assessment of Fas receptor and Bcl-2 expression in the same cell populations.

Main Results:

  • Specific overexpression of both long and short forms of FLIP was detected in intrathecal lymphocytes from multiple sclerosis patients.
  • FLIP overexpression was independent of cellular expression levels of the Fas receptor.
  • FLIP overexpression was also independent of the expression of the anti-apoptotic protein Bcl-2.

Conclusions:

  • Overexpression of FLIP in intrathecal lymphocytes is a specific finding in multiple sclerosis.
  • This FLIP overexpression may represent an intrinsic immunoregulatory mechanism contributing to the pathogenesis of multiple sclerosis by inhibiting T lymphocyte apoptosis.
  • The findings offer new insights into the molecular mechanisms underlying immune dysregulation in multiple sclerosis.

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