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Prof Fionula Brennan

Strategies to identify novel targets for therapeutic intervention in chronic inflammatory disease
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Inflammatory synovial joint tissue from RA patients:
a source of cells for experimental analysis
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RA synovial joint cell ex vivo culture
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Good evidence that TNF is an important component in the pathology of RA
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Anti-TNF Biologicals : circa 2007
  • Over 1,000,000 patients treated since licensed.
  • Very effect on inflammation and joint protection
  • Market heading towards $10B
  • however……………………………………..
  • 60-70% response rate
  • Not a Cure
  • Very Costly to make and buy
  • Has to be injected
  • Infectious Risks
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In RA synovial joint cell tissue what
drives inflammation?
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Cytokine-activated PBLs are surrogates for RA synovial T cell effector function
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What is phenotype of Tck effector cell?
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Identification of ligand on Tck cells responsible for effector function
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Microarray analysis
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Microarray analysis
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Tck membrane proteins identified by MS/MS  (confirmed by FACS)
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CD38high population correlated with the CD4CD45RO Tck effector function
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CD38
  • Type II transmembrane glycoprotein


  •  ectoenzyme catalyses synthesis of cyclic ADP ribose


  • Express on early T and B cells, activated T cells, GC B cells and plasma cells


  • Ligand CD31, expresses on monocytes, granulocytes, platelets, B cells and endothelial cells


  • Induce cell proliferation, inflammatory cytokine production, activation, cell interaction


  • CD38+ plasma cells found in synovial tissues and distinguishes RA from non-RA (Haringman et al, 1999, Rheumatology 38:1074-1080)


  • huMaxCD38 pre-clinical trials (multiple myeloma) http://www.medicalnewstoday.com/medicalnews.php?newsid=44965


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"Viral & Non-Viral delivery systems"


  • Viral & Non-Viral delivery systems
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Applications in RA
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Delivery Strategies
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siRNA knockdown of Stat3 in Human Monocytes + Macrophages
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Summary
  • TNF validated target in RA


  • Selective abrogation of TNF synthesis at inflammatory sites desirable


  • Opportunity to identify new therapeutic targets using RNAi knock down in models of chronic inflammation