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Analysis of peripheral immune activation in schizophrenia using quantitative reverse-transcription polymerase chain
Oliver Freudenreich1, Mark A Brockman, David C Henderson
1Schizophrenia Program, Massachusetts General Hospital, Boston, MA, United States. ofreudenreich@partners.org
Insights
Schizophrenia is linked to reduced Type 1 immune response, specifically lower interferon-gamma (IFN-gamma) and tumor necrosis factor-alpha (TNF-alpha) gene expression in immune cells. This suggests impaired cellular immunity in patients with schizophrenia.
Area of Science:
- Neuroimmunology
- Psychiatric research
- Molecular biology
Background:
- Schizophrenia exhibits immune system abnormalities, characterized by a shift from Type 1 (cellular) to Type 2 (humoral) immune responses.
- Understanding immune system activation in schizophrenia is crucial for identifying potential biomarkers.
Purpose of the Study:
- To investigate the gene expression patterns of key immune cytokines in schizophrenia patients.
- To compare the levels of Th1 and Th2 cytokines in peripheral blood cells of schizophrenia patients and healthy controls.
Main Methods:
- Quantitative reverse-transcription polymerase chain reaction (RT-PCR) was used to measure mRNA levels.
- Peripheral blood mononuclear cells (PBMCs) were analyzed from 15 schizophrenia patients and 15 matched healthy controls.
- Gene expression of interferon-gamma (IFN-gamma), tumor necrosis factor-alpha (TNF-alpha), interleukin-2 (IL-2), and interleukin-10 (IL-10) was quantified.
Main Results:
- Significantly reduced mRNA expression of IFN-gamma and TNF-alpha was observed in schizophrenia patients compared to controls.
- No significant differences in IL-2 and IL-10 gene expression were found between the groups.
- The findings indicate a reduction in Type 1 cytokine gene expression.
Conclusions:
- The results support the hypothesis of impaired Type 1 cellular immunity in schizophrenia.
- mRNA expression analysis offers a potential method for identifying immune biomarkers in neuropsychiatric disorders.
- Further research correlating gene expression with direct cytokine levels is warranted.
Abstract:
Immune system abnormalities in schizophrenia include a shift from a Type 1 (cellular) to a Type 2 (humoral) immune response. To characterize the activation status of the immune system in schizophrenia, we examined the pattern of gene expression in peripheral blood cells for three Th1 cytokines (interferon-gamma (IFN-gamma), tumor necrosis factor-alpha (TNF-alpha), interleukin-2 (IL-2)), and one Th2 cytokine (interleukin-10 (IL-10)). In a cross-sectional study, we used quantitative reverse-transcription polymerase chain reaction (RT-PCR) to compare the mRNA levels of IFN-gamma, TNF-alpha, IL-2, and IL-10 in peripheral blood mononuclear cells (PBMCs) between 15 schizophrenia patients and 15 matched healthy controls. Expression of IFN-gamma and TNF-alpha was significantly reduced in patients with schizophrenia compared with normal controls. No differences in IL-2 and IL-10 gene expression were observed. These results are consistent with impaired Type 1 cellular immunity in schizophrenia. While the data illustrate the potential utility of mRNA-based approaches for the identification and analysis of immune biomarkers for neuropsychiatric disorders, correlation of gene expression with direct measures of cytokine concentrations is required.
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