cDNA microarray analysis in multiple sclerosis lesions: detection of genes associated with disease activity.
cDNA microarray analysis of the regions of pathologically proven different activity of multiple sclerosis lesions was performed. Major differences in gene expression (DGE) occurred between the lesion margin and lesion centre in active lesions studied (57 and 69 genes differentially expressed, respectively), whereas the margins and centres of silent lesions showed markedly reduced heterogeneity (only 11 and two genes differentially expressed, respectively). To compare differences between chronic active and silent lesions, we performed DGE comparison of the pooled data from both types of lesions. The major DGE occurred at the lesion margin, 156 (26; 5%), the greater number representing upregulated genes at the margin of active lesions (15%). Fourteen genes were found to be significantly upregulated in marginal versus central zones in active lesions examined. These genes comprised predominantly inflammation/immune-related factors. We also performed DGE analysis of pooled genes upregulated at the margin of active lesions and found that among the 50 genes showing differences, nine out of 14 were identified in the previous analysis of overlapping differentially expressed genes. Thus this microarray analysis has identified a novel set of genes associated with lesion activity in multiple sclerosis, many of them not previously linked with the disease.
Mycko
Marcin P
MP
Department of Neurology, Medical University of Lodz, Lodz, Poland, Serono Research Institute, Geneva, Switzerland.
Papoian
Ruben
R
Boschert
Ursula
U
Raine
Cedric S
CS
Selmaj
Krzysztof W
KW
D001921:Brain / Q000378:metabolism*; D018797:Cell Cycle Proteins / Q000235:genetics; D002908:Chronic Disease; D016207:Cytokines / Q000235:genetics; D018076:DNA, Complementary / Q000032:analysis*; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D006801:Humans; D019656:Loss of Heterozygosity; D009103:Multiple Sclerosis / Q000235:genetics* / Q000276:immunology; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D011956:Receptors, Cell Surface / Q000235:genetics; D015290:Second Messenger Systems / Q000235:genetics; D014157:Transcription Factors / Q000235:genetics
D018797:Cell Cycle Proteins; D016207:Cytokines; D018076:DNA, Complementary; D011956:Receptors, Cell Surface; D014157:Transcription Factors