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Visualization of migration of transplanted astrocytes using polystyrene microspheres
C J Emmett1, J M Lawrence, P J Seeley
1Laboratory of Neurobiology and Development, National Institute for Medical Research, London, U.K.
Brain Research
|May 3, 1988
Summary
Fluorescent microspheres effectively label rat astrocytes for transplantation without toxicity. Labeled astrocytes remain marked for weeks, aiding cell tracking in recipient brains.
Area of Science:
- Neuroscience
- Cell Biology
- Biomaterials
Background:
- Astrocytes play crucial roles in brain function and are targets for cell transplantation therapies.
- Accurate tracking of transplanted cells is essential for evaluating therapeutic efficacy and understanding cell behavior in vivo.
- Current cell labeling methods may have limitations in duration, visibility, or potential toxicity.
Purpose of the Study:
- To develop and evaluate a simple, reliable method for long-term fluorescent labeling of rat astrocytes for transplantation.
- To assess the biocompatibility and retention of fluorescent microspheres within astrocytes.
- To track the migration and localization of labeled astrocytes in the host brain following transplantation.
Main Methods:
- Incorporation of fluorescent polystyrene microspheres (50-200 nm, rhodamine or fluorescein) into rat astrocytes over ~10 hours.
- Assessment of astrocyte viability and microsphere retention using fluorescence and transmission electron microscopy.
- Stereotactic transplantation of labeled neonatal astrocytes into the hippocampi of adult syngeneic rats.
- Monitoring of donor cell migration and localization in host tissue over several weeks.
Main Results:
- Astrocytes successfully incorporated fluorescent microspheres without apparent cytotoxic effects.
- Microspheres were retained within astrocytes for at least several weeks, visualized via fluorescence and electron microscopy.
- Phagocytosis of microspheres occurred via a coated-pit mechanism, accumulating in lysosomal vesicles.
- Transplanted astrocytes migrated from the implant site and were found in paravascular spaces, often near blood vessels, over 7 days.
Conclusions:
- Fluorescent microsphere loading is a simple and effective method for long-term marking of astrocytes for transplantation studies.
- This technique allows for direct identification of transplanted cells using both fluorescence and electron microscopy.
- The method facilitates the study of astrocyte migration, integration, and survival in the host brain.