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[Ultrastructural study of the growth pattern in an experimental meningeal gliomatosis model]
S Narumi1, M Murakami, T Murakami
1Department of Neurosurgery, School of Medicine, Iwate Medical University, Japan.
Abstract:
We tried to examine the growth pattern of meningeal gliomatosis (MG) by using an experimental MG model. C6 rat glioma cells (3 X 10(5)/0.1 ml) were injected percutaneously into the cisterna magna of rats. Seven days after inoculation, the brains and spinal cords were removed and processed for morphological observation. Light microscopic findings showed that numerous tumor cells had invaded the spinal cord parenchyma directly and/or via the Virchow-Robin spaces. In contrast, a small amount of tumor cells had spread horizontally on the surface of the spinal cord. By transmission electron microscopy, discontinuity of the basal lamina (of the marginal glia) was found, and some tumor cells were found to have protruded their processes into the spinal cord parenchyma. A basal lamina-like granular material was observed in the vicinity of these areas, indicating the breakdown of the basal lamina. Scanning electron microscopic findings further supported the speculation concerning the penetration of the pia mater by tumor cells through the small pores which had blunt margins. From these ultrastructural observations, we speculated that some chemical membranolytic factors might play an important role in MG.
Insights
This study reveals meningeal gliomatosis (MG) invades spinal cord parenchyma via direct entry and Virchow-Robin spaces. Ultrastructural analysis suggests chemical factors may degrade the basal lamina, facilitating tumor cell invasion.
Area of Science:
- Neuro-oncology
- Cellular Biology
- Pathology
Context:
- Meningeal gliomatosis (MG) is a rare form of leptomeningeal carcinomatosis.
- Understanding the invasion patterns of glioma cells is crucial for developing effective treatments.
Purpose:
- To investigate the growth pattern and invasion mechanisms of meningeal gliomatosis (MG) using an experimental rat model.
- To elucidate the ultrastructural changes associated with tumor cell invasion into the central nervous system.
Summary:
- An experimental model of meningeal gliomatosis (MG) was established by injecting C6 rat glioma cells into the cisterna magna of rats.
- Light microscopy revealed tumor cell invasion into the spinal cord parenchyma directly and via Virchow-Robin spaces, with limited surface spread.
- Transmission and scanning electron microscopy demonstrated basal lamina discontinuity and tumor cell protrusion into the parenchyma, suggesting a role for chemical membranolytic factors in invasion.
Impact:
- Provides insights into the cellular mechanisms of meningeal gliomatosis (MG) invasion.
- Highlights the potential role of basal lamina degradation in tumor cell spread within the central nervous system.
- Suggests novel therapeutic targets focused on inhibiting membranolytic factors to prevent MG progression.