Abstract：
AIMS/HYPOTHESIS:It is thought that enterovirus infections initiate or facilitate the pathogenetic processes leading to type 1 diabetes. Exposure of cultured human islets to cytolytic enterovirus strains kills beta cells after a protracted period, suggesting a role for secondary virus-induced factors such as cytokines. METHODS:To clarify the molecular mechanisms involved in virus-induced beta cell destruction, we analysed the global pattern of gene expression in human islets. After 48 h, RNA was extracted from three independent human islet preparations infected with coxsackievirus B5 or exposed to interleukin 1beta (50 U/ml) plus interferon gamma (1,000 U/ml), and gene expression profiles were analysed using Affymetrix HG-U133A gene chips, which enable simultaneous analysis of 22,000 probe sets. RESULTS:As many as 13,077 genes were detected in control human islets, and 945 and 1293 single genes were found to be modified by exposure to viral infection and the indicated cytokines, respectively. Four hundred and eighty-four genes were similarly modified by the cytokines and viral infection. CONCLUSIONS/INTERPRETATION:The large number of modified genes observed emphasises the complex responses of human islet cells to agents potentially involved in insulitis. Notably, both cytokines and viral infection significantly (p<0.02) increased the expression of several chemokines, the cytokine IL-15 and the intercellular adhesion molecule ICAM-1, which might contribute to the homing and activation of mononuclear cells in the islets during infection and/or an early autoimmune response. The present results provide novel insights into the molecular mechanisms involved in viral- and cytokine-induced human beta cell dysfunction and death.
journal_name
Diabetologiajournal_title
Diabetologiaauthors
Ylipaasto P,Kutlu B,Rasilainen S,Rasschaert J,Salmela K,Teerijoki H,Korsgren O,Lahesmaa R,Hovi T,Eizirik DL,Otonkoski T,Roivainen Mdoi
10.1007/s00125-005-1839-7subject
Has Abstractpub_date
2005-08-01 00:00:00pages
1510-22issue
8eissn
0012-186Xissn
1432-0428journal_volume
48pub_type
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