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Interferon beta-1a downregulates TNFalpha-induced intercellular adhesion molecule 1 expression on brain microvascular

G Defazio1, P Livrea, M Giorelli

  • 1Department of Neurologic and Psychiatric Sciences, University of Bari, I-70124, Bari, Italy. gdefazio@neurol.uniba.it

Brain Research
|October 19, 2000
PubMed

Insights

Interferon-beta-1a modulates tumor necrosis factor-alpha (TNFalpha) effects on brain endothelial cells. A tyrosine kinase pathway, not protein kinase C, is key to this interaction, impacting intercellular adhesion molecule 1 (ICAM1) expression.

Area of Science:

  • Neuroimmunology
  • Cellular and Molecular Biology
  • Endothelial Cell Biology

Background:

  • Tumor necrosis factor-alpha (TNFalpha) plays a role in neuroinflammation.
  • Intercellular adhesion molecule 1 (ICAM1) expression on brain microvascular endothelial cells (BMECs) is implicated in inflammatory responses.

Purpose of the Study:

  • To investigate the mechanism by which interferon (IF) beta-1a modulates TNFalpha-induced ICAM1 expression in BMECs.
  • To determine whether tyrosine kinase (TK) or protein kinase C (PKC) pathways are involved.

Main Methods:

  • BMEC cultures were treated with TNFalpha.
  • The effects of TK inhibitor genestein, PKC inhibitor staurosporin, and IFbeta-1a were assessed.
  • Combinations of IFbeta-1a with genestein or staurosporin were tested at varying doses.

Main Results:

  • TNFalpha upregulated ICAM1 expression in BMECs.
  • Genestein, staurosporin, and IFbeta-1a individually antagonized the TNFalpha effect.
  • A combination of sub-effective doses of IFbeta-1a and genestein significantly reduced TNFalpha-induced ICAM1 expression, while IFbeta-1a and staurosporin did not.

Conclusions:

  • Interferon beta-1a modulates TNFalpha-induced ICAM1 expression on brain microvascular endothelial cells.
  • The mechanism involves a tyrosine kinase-dependent pathway, not protein kinase C.
  • These findings offer insights into the molecular regulation of neuroinflammatory responses.

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