[Specific interactions between microglia and oligodendrocytes in white matter in continuous schizophrenia]

Area of Science:

• Neuroscience
• Cell Biology
• Pathology

Context:

• Schizophrenia is a complex psychiatric disorder with debated underlying neuropathology.
• Microglia and oligodendrocytes play critical roles in white matter integrity and function.
• Distinct clinical subtypes of schizophrenia may exhibit unique cellular alterations.

Purpose:

• To investigate the ultrastructural differences of microglia adjacent to oligodendrocytes in the prefrontal cortex white matter of continuous schizophrenia (CSch) and attack-like schizophrenia (ASch) patients compared to controls.
• To analyze correlations between microglial and oligodendrocyte parameters in both schizophrenia subtypes.

Summary:

• Electron microscopy revealed reduced mitochondrial volume and number in microglia of elderly CSch patients, alongside increased lipofuscin granules, suggesting accelerated aging and metabolic disturbances.
• Microglial nuclear heterochromatin area increased in both CSch and ASch groups, correlating negatively with microglial density in CSch.
• Oligodendrocyte mitochondrial reduction in CSch correlated with microglial mitochondrial changes and lipofuscin accumulation, indicating intercellular metabolic crosstalk.

Impact:

• Findings highlight specific metabolic and nuclear alterations in microglia in CSch, potentially contributing to oligodendrocyte dysfunction.
• The study suggests accelerated microglial aging as a factor in CSch pathophysiology.
• These cellular insights may inform future therapeutic strategies targeting white matter integrity in schizophrenia.