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Articles by D. A Isenberg
Total Records ( 2 ) for D. A Isenberg
  B. J. M Ripley , M Fujimoto , S Serada , T Ohkawara , T Nishikawa , F Terabe , Y Matsukawa , A Stephanou , R. A Knight , D. A Isenberg , D. S Latchman , T Kishimoto and T. Naka
 

Therapeutic effects of green tea involve an inhibitory function of its constituent polyphenol epigallocatechin gallate (EGCG) on cell signaling. The specificity and mechanism(s) by which EGCG inhibits cell signaling have remained unclear. Here, we demonstrate that green tea and EGCG induce suppressor of cytokine signaling 1 (SOCS1) gene expression, a negative regulator of specific cell signaling pathways. In mouse immune cells, EGCG induces SOCS1 expression via an oxidative (superoxide) pathway and activation of the signal transducer and activator of transcription 5 transcription factor. EGCG inhibited SOCS1-regulated cell signaling, but this inhibitory effect was abrogated in cells deficient in SOCS1. These findings identify a mechanism by which EGCG inhibits cell signaling with specificity, mediated by induction of the negative regulator SOCS1.

  C. S Yee , V Farewell , D. A Isenberg , B Griffiths , L. S Teh , I. N Bruce , Y Ahmad , A Rahman , A Prabu , M Akil , N McHugh , C Edwards , D D`Cruz , M. A Khamashta , P Maddison and C. Gordon
 

Objective. To determine if the BILAG-2004 index is sensitive to change for assessment of SLE disease activity.

Methods. This was a prospective multi-centre longitudinal study of SLE patients. At every assessment, data were collected on disease activity (BILAG-2004 index) and treatment. Analyses were performed using overall BILAG-2004 index score (as determined by the highest score achieved by any of the individual systems) and all the systems scores. Sensitivity to change was assessed by determining the relationship between change in disease activity and change in therapy between two consecutive visits. Statistical analyses were performed using multinomial logistic regression.

Results. There were 1761 assessments from 347 SLE patients that contributed 1414 observations for analysis. An increase in therapy between visits occurred in 22.7% observations, while 37.3% had a decrease in therapy and in 40.0% therapy was unchanged. Increase in overall BILAG-2004 index score was associated with increase in therapy and inversely associated with decrease in therapy. Decrease in overall BILAG-2004 index score was associated with decrease in therapy and was inversely associated with increase in therapy. Changes in overall BILAG-2004 index score were differentially related to change in therapy, with greater change in score having greater predictive power. Increase in the scores of most systems was independently associated with an increase in treatment and there was no significant association between decreases in the score of any system with an increase in therapy.

Conclusions. The BILAG-2004 index is sensitive to change and is suitable for use in longitudinal studies of SLE.

 
 
 
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