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Increased expression of caspase-1 and interleukin-18 in peripheral blood mononuclear cells in patients with multiple

Wen-Xin Huang1, Ping Huang, Jan Hillert

  • 1Division of Neurology, Karolinska Institute, Huddinge University Hospital, Huddinge, Sweden.

Multiple Sclerosis (Houndmills, Basingstoke, England)
|October 9, 2004
PubMed

Insights

This study found increased levels of caspase-1 and interleukin-18 (IL-18) in multiple sclerosis (MS) patients, suggesting a potential role for these molecules in MS pathogenesis and future therapies.

Area of Science:

  • Neuroimmunology
  • Immunology
  • Molecular Biology

Background:

  • Multiple sclerosis (MS) is an autoimmune disorder affecting the central nervous system, with T-cells and apoptosis-regulating molecules implicated in its pathogenesis.
  • The role of specific cytokines, such as interleukin-18 (IL-18) and interleukin-1beta (IL-1beta), and their processing enzyme caspase-1 in MS is not fully elucidated.

Purpose of the Study:

  • To quantify the mRNA and protein expression levels of IL-18, IL-1beta, and caspase-1 in peripheral blood mononuclear cells (PBMCs) of untreated multiple sclerosis patients.
  • To investigate the correlation between the expression of these molecules and different clinical subtypes of MS.

Main Methods:

  • Competitive reverse transcription-polymerase chain reaction (RT-PCR) was used to measure mRNA levels of IL-18, IL-1beta, and caspase-1.
  • Western blot analysis was employed to validate protein expression patterns.
  • Peripheral blood mononuclear cells (PBMCs) were analyzed from patients with multiple sclerosis and healthy controls.

Main Results:

  • Significantly increased mRNA expression of caspase-1 and IL-18 was observed in multiple sclerosis patients compared to healthy controls.
  • Caspase-1 expression was elevated across all MS clinical subgroups.
  • IL-18 was upregulated in chronic progressive MS and relapsing MS patients in remission, but not during relapses.
  • IL-1beta mRNA levels showed no significant alteration, with a possible decrease in chronic progression.

Conclusions:

  • Elevated expression of caspase-1 and IL-18 suggests their involvement in the pathogenesis of multiple sclerosis.
  • The increased IL-18 expression, potentially at the protein level, highlights a promising pathway for future therapeutic strategies in MS.
  • Further research into the role of IL-18 and caspase-1 could lead to novel treatment approaches for multiple sclerosis.

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