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Migratory behavior of PC12 cells transplanted into neonatal rat brain
J D Hatton1, B C Jackson, P Y Kelley
1Division of Neurosurgery, University of California, San Diego, La Jolla 92093.
Insights
PC12 rat pheochromocytoma cells migrate within the brains of older neonatal rats, not forming tumors. This neural migration is regionally constrained by the local environment.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- PC12 rat pheochromocytoma cells can form tumors in young neonatal rat brains.
- The behavior of PC12 cells in older neonatal rat brains remains poorly understood.
- Understanding PC12 cell fate is crucial for studying neural development and transplantation outcomes.
Purpose of the Study:
- To investigate the migration patterns and fate of PC12 cells transplanted into the brains of 5-day-old rats.
- To determine if PC12 cells form tumors in this older neonatal environment.
- To explore the influence of the neural environment on PC12 cell behavior.
Main Methods:
- Transplantation of [3H]thymidine-labeled PC12 cells into the forebrains of 5-day-old rats.
- Analysis of labeled cell distribution at 5, 11, and 16 days post-transplantation.
- Control experiments using [3H]thymidine alone or labeled astrocytes.
Main Results:
- PC12 cells clustered around ventricles 5 days post-transplantation.
- By 11 days, cells migrated into the hippocampus and cerebral cortex, with some invasion of the hypothalamus.
- Migration appeared regionally constrained, with limited crossing of the midline or invasion of thalamus/midbrain; no tumors were detected.
Conclusions:
- PC12 cells exhibit migratory behavior when transplanted into the brains of older neonatal rats.
- The migration of PC12 cells is influenced by regional constraints and the local trophic environment.
- PC12 cells do not form detectable tumors in this specific experimental context.
Abstract:
PC12 rat pheochromocytoma cells form tumors when transplanted into the forebrains of 1-4-day-old neonatal rats; thereafter, the incidence of tumor formation declines rapidly with increasing recipient age. The fate of PC12 cells transplanted into the forebrains of older neonates is thus not well defined. To examine the interactions of PC12 cells with this older neural environment, we transplanted [3H]thymidine-labeled PC12 cells into the brains of 5-day-old rats. In the brains of animals sacrificed 5 days after transplantation, clusters of labeled cells were found in and around the lateral and third ventricles. By 11 days after transplantation, single labeled cells were found to migrate into the hippocampus and the nearby cerebral cortex. Occasional invasion of the ventral hypothalamus from the third ventricle was also observed. Cells were rarely found to cross the midline or to invade the thalamus or the midbrain. The same pattern of labeling was found in the brains of animals sacrificed at 16 days after inoculation, suggesting that migration was completed by that time. No tumors were detectable, despite the implantation of cells in and around the ventricles. Control injections of [3H]thymidine alone or of [3H]thymidine-labeled astrocytes showed no labeling above background. These results suggest that PC12 cells migrate after inoculation into the brains of older neonatal rats. Additionally, this migration may be regionally constrained and dictated by the specific local trophic environment.