Transmission electron microscope study of human hydrocephalic cerebral cortex

Area of Science:

• Neuroscience
• Cell Biology
• Pathology

Background:

• Hydrocephalus is a neurological condition characterized by abnormal accumulation of cerebrospinal fluid in the brain.
• Associated pathologies can exacerbate the neurological damage observed in hydrocephalus.
• Understanding cellular alterations is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the ultrastructural changes in neurons, neuroglial cells, extracellular space, and capillary walls in hydrocephalic patients.
• To elucidate the cellular mechanisms underlying brain damage in hydrocephalus.

Main Methods:

• Transmission electron microscopy was used to examine cortical biopsies from 17 hydrocephalus patients.
• Detailed ultrastructural analysis of neuronal and glial morphology, extracellular matrix, and cerebral microvasculature.

Main Results:

• Nerve cells exhibited swelling, endoplasmic reticulum dilation, Golgi apparatus degeneration, and mitochondrial abnormalities.
• The neuropil showed enlarged extracellular space and synaptic degeneration, including swollen synaptic endings and detached glial ensheathment.
• Astrocytes displayed edema and phagocytic activity, while oligodendrocytes showed hydropic changes; no mitotic divisions were observed.
• Blood-brain barrier dysfunction was evident, with increased endothelial vesicular transport, open interendothelial junctions, and basement membrane thickening.

Conclusions:

• Hydrocephalus induces widespread cellular damage in the brain, affecting neurons, glia, and the microvasculature.
• Synaptic degeneration and blood-brain barrier disruption are key pathological features of hydrocephalus.
• These ultrastructural findings provide critical insights into the pathophysiology of hydrocephalus and associated neurological deficits.