Abstract:
:Activation of the inflammatory response system has been related to the pathophysiology of schizophrenia by several recent studies. Schizophrenic patients have varied levels of proinflammatory cytokines, such as interleukin (IL)-1, -6, and tumor necrosis factor (TNF)alpha in their peripheral blood or cerebrospinal fluid. These cytokines can modify the metabolism of neurotransmitters, influence neural development, and IL-1 has been implicated in acute, and, on the other hand, chronic neurodegeneration. They could therefore be of primary pathogenic importance, either in the acute disease or during those stages of brain development which possibly influence the sensitivity of a person to schizophrenia in later life. The cytokine regulation of brain development and its possible neuroimmune involvement in the pathogenesis of schizophrenia has been raised. One indication of the pathogenic role of IL-1 in schizophrenia would be a demonstration of the difference between schizophrenic patients and healthy controls at the gene level. Therefore we analyzed the polymorphism of the IL-1 gene complex in 50 schizophrenic patients and in 400 healthy blood donors. The following allelisms were analyzed: IL-1beta gene: base exchange polymorphisms at the positions -511 (relative to the transcriptional start site); IL-1alpha gene: base exchange polymorphism at the position -889; IL-1 receptor antagonist (IL-1RA) gene: variable numbers of 86-base pair tandem repeats in intron 2. The frequencies of the IL-1beta (-511) allele 1, IL-1alpha (-889) allele 2, and IL-1RA allele 1 were somewhat, but not significantly, higher in the schizophrenic patients as compared to the controls. These alleles are known to be located on the same haplotype. The number of carriers of this haplotype was significantly higher in the schizophrenia patients (17/50 vs 81/400) than in the controls (P=0.026, chi2). The frequencies of this haplotype were 0.38 and 0.27, respectively (P=0.0266, chi2). The number of homozygotes of this haplotype was significantly higher in the schizophrenia patients (P=0.0006, chi2). These data suggest that the cytokine aberrations in schizophrenia are, at least partly, genetically determined.
journal_name
Mol Psychiatryjournal_title
Molecular psychiatryauthors
Katila H,Hänninen K,Hurme Mdoi
10.1038/sj.mp.4000483subject
Has Abstractpub_date
1999-03-01 00:00:00pages
179-81issue
2eissn
1359-4184issn
1476-5578journal_volume
4pub_type
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