Nitric oxide production and MDR expression by human brain endothelial cells

Yvette Mándi, Imre Ocsovszki, Diana Szabo, Zsuzsanna Nagy, Jay Nelson, Joseph Molnar

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The endothelium both initiates and responds to a cascade of events triggered by cytokines. Enhanced formation of the NO, especially by inducible nitric oxide- synthase (iNOS), is largely stimulated by tumor necrosis factor (TNF). Nitrogen oxides are reactive intermediate molecules functioning in neural transmission, and vasodilatation. The aim of our study was to investigate the effect of TNF and Staphylococcus aureus, a TNF inducing agent on the NO production of brain endothelial cells in vitro. The effect of the same agent was investigated on the MDR expression of endothelial cells. Both TNF and Staphylococcus aureus resulted in enhanced NO production. Western blot analysis showed enhanced expression of iNOS, which could be inhibited by pentoxifylline, an inhibitor of TNF synthesis. Flow cytometric analysis revealed that the brain capillary endothelial cells exerted P-glycoprotein expression, which was not influenced by TNF. However, the mdr function itself in these cells was decreased by TNF. Cultured endothelial cells are excellent tools for the investigation of the possible connection between the NO production and MDR function, and for the estimation the effect of different agents influencing these activities, which might be important in blood-brain barrier function.

Original languageEnglish (US)
Pages (from-to)3049-3052
Number of pages4
JournalAnticancer research
Issue number4 C
StatePublished - Jul 1998


  • Endothelial cells
  • Multidrug resistance
  • Nitric oxide
  • TNF

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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