Schizophrenia is considered a neurodevelopmental disorder with a multifactorial pathogenesis where autoimmune factors may play a significant role. The aim of this study was to verify the presence of anti-brain autoantibodies in the serum of schizophrenic patients compared to healthy controls. Autoantibodies against brain were detected by the immunofluorescence method, utilizing sections of rat hippocampus and hypothalamus and of monkey cerebellum. Three different fluorescence patterns were observed, staining the nucleus-cytoplasm of neurons, the neuroendothelial of blood vessel and the neurofilaments. Search for other organ-specific and non organ-specific autoantibodies was performed in all sera by indirect immunofluorescence method, enzyme linked immunosorbent assay and chemiluminescence immunoassay. Results showed a significant association between schizophrenia and anti-brain autoantibodies against the neuroendothelium of blood vessel in hypothalamus, hippocampus and cerebellum; a significant nuclear and cytoplasmic staining of neurons was assessed only for the hippocampus. No other significant association was found, except between schizophrenia and anti-nuclear autoantibodies on HEp-2 cells. In conclusion, these results support the hypothesis of a significant association between schizophrenia and circulating anti-brain autoantibodies, suggesting a diffuse reactivity against the neuroendothelium of blood vessel and highlighting a nuclear and cytoplasmic staining of the neurons of hippocampus.

Anti-brain autoantibodies in the serum of schizophrenic patients: A case-control study

State of innate and adaptive immunity has been assessed by the indices of activity of leukocyte elastase, alpha1-proteinase inhibitor (alpha(1)-PI), level of C-reactive protein and autoantibodies to neuroantigens (nerve growth factor and basic myelin protein) in different forms of mentalopathology: schizophrenia-spectrum disorders, mental retardation with behavioral abnormalities, organic mental disorders, affective disorders, psychogenias (adaptation disorders), early alcoholism. The increase of activity or levels of all immunological parameters was characteristic of these diseases. However within each group were patients with different levels of immunity activation. A number of patients with significant immunity activation was higher in the groups of schizophrenia-spectrum disorders, early alcoholism, organic mental disorders, mental retardation with behavioral abnormalities and affective disorders. The lowest frequency of such cases was observed for psychogenias (adaptation disorders). These results give grounds to suggest that the extent of immunity activation depends as on severity of psychopathogy as well on individual peculiarities of immunological reactivity in response to a brain pathological process.

Immunological reactions in different forms of mental disorders

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Immunological reactions in different forms of mental disorders