Related Experiment Video
Updated: May 23, 2026
05:14
Standardized Data Acquisition for Neuromelanin-Sensitive Magnetic Resonance Imaging of the Substantia Nigra
Published on: September 8, 2021
Impaired monocyte activation in schizophrenia
Norbert Müller1, Jenny K Wagner, Daniela Krause
1Department of Psychiatry and Psychotherapy, Ludwig-Maximilian University, Nussbaumstr. 7, 80336 Munich, Germany. Norbert.Mueller@med.uni-muenchen.de
Psychiatry Research
|March 21, 2012
Summary
Schizophrenia patients show higher Toll-like receptor (TLR)-3 and TLR-4 expression on monocytes but lower interleukin-1ß (IL-1ß) levels. This suggests immune dysfunction may contribute to inflammation in schizophrenia.
Area of Science:
- Neuroimmunology
- Innate Immunity
Background:
- Schizophrenia is linked to inflammation, with innate immunity, particularly monocytes/macrophages, understudied.
- Alterations in microglia and increased monocyte counts suggest immune system involvement.
Purpose of the Study:
- To investigate Toll-like receptor (TLR) expression and interleukin-1ß (IL-1ß) production in monocytes of schizophrenia patients.
- To explore potential immune dysfunctions in schizophrenia.
Main Methods:
- Flow cytometry was used to analyze TLR-2, TLR-3, and TLR-4 expression on CD14(+) monocytes.
- Monocytes were stimulated with lipopolysaccharides (LPS) or polyI:C to mimic bacterial or viral infections.
- Intracellular IL-1ß concentrations in CD33(+) monocytes were measured before and after stimulation.
Main Results:
- Schizophrenia patients exhibited significantly higher surface expression of TLR-3 and TLR-4 compared to controls.
- Patients showed a diminished increase in TLR-3 and TLR-4 expression after stimulation.
- Lower intracellular IL-1ß concentrations were observed in patients, both before and after stimulation.
Conclusions:
- Elevated TLR-3 and TLR-4 expression may represent a compensatory mechanism for functional deficits in schizophrenia.
- Reduced IL-1ß levels suggest blunted monocytic function, potentially contributing to impaired pathogen clearance and chronic inflammation.
- These immunological dysfunctions may play a role in the pathophysiology of schizophrenia.
Related Concept Videos
01:29Biological Causes of Schizophrenia
Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
01:27Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders
Schizophrenia is a neurodevelopmental disorder whose origins are rooted in complex genetic components. Despite our burgeoning understanding, the pathophysiology of this disorder remains incompletely deciphered.
Researchers have identified genetic factors that increase susceptibility to schizophrenia, underscoring the intricate interplay between genetics and environment in disease development. At the core of schizophrenia's pathophysiology is excessive dopaminergic neurotransmission within the...
Researchers have identified genetic factors that increase susceptibility to schizophrenia, underscoring the intricate interplay between genetics and environment in disease development. At the core of schizophrenia's pathophysiology is excessive dopaminergic neurotransmission within the...
01:29Psychological and Sociocultural Causes of Schizophrenia
Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...
01:30Negative and Cognitive Symptoms of Schizophrenia
Negative symptoms of schizophrenia indicate a reduction or absence of typical behaviors and emotional responses found in healthy individuals, while positive symptoms reflect an excess or distortion of normal functioning.
Negative Symptoms
Negative symptoms of schizophrenia manifest as deficits in normal emotional and behavioral functioning, profoundly impacting daily life. Individuals with schizophrenia often display a flat affect, characterized by a near-total absence of emotional expression,...
Negative Symptoms
Negative symptoms of schizophrenia manifest as deficits in normal emotional and behavioral functioning, profoundly impacting daily life. Individuals with schizophrenia often display a flat affect, characterized by a near-total absence of emotional expression,...
01:17Schizophrenia
Schizophrenia, a term introduced by Swiss psychiatrist Eugen Bleuler in 1911, describes a severe psychological disorder marked by profound disruptions in attention, thought processes, language, emotion, and interpersonal relationships. The core feature of schizophrenia is psychosis — a state characterized by a fundamental detachment from reality. This disconnection manifests through distorted logic, impaired perception, and atypical behavior, severely affecting the lives of those diagnosed.
01:30Positive Symptoms of Schizophrenia: Hallucinations and Delusions
Schizophrenia is a complex mental health disorder that can manifest with various positive symptoms, including thought, movement, and behavior disorders. These symptoms significantly disrupt cognitive and motor functions, leading to profound effects on an individual's ability to engage with the world.
Thought Disorders
Disorganized and unusual thought processes mark thought disorders in schizophrenia. One key feature is disorganized speech, where an individual's conversation includes loosely...
Thought Disorders
Disorganized and unusual thought processes mark thought disorders in schizophrenia. One key feature is disorganized speech, where an individual's conversation includes loosely...