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Cerebral microvessels and derived cells in tissue culture: isolation and preliminary characterization
Abstract:
Microvessels isolated from mouse forebrain were used as the source material for the derivation of cerebral vascular endothelium and smooth-muscle cells in culture. The microvessels were isolated by a mechanical dispersion and filtration technique, and were maintained in vitro as organoid cultures. A microvessel classification system was developed and proved to be useful as a tool in monitoring culture progress and in predicting the type(s) of microvessel(s) that would give rise to migrating and/or proliferating cells. The isolated cerebral microvessels were heterogeneous in diameter, size of individual vascular isolate, and proliferative potential. The isolated microvessels ranged in diameter from 4 micron to 25 micron and in size from a single microvascular segment to a large multibranched plexus with mural cells. The initial viability, determined by erythrosin B exclusion, was approximately 50% on a per cell basis. All microvessel classes had proliferative potential although the rate and extent of proliferation were both microvessel class- and density-dependent. The smaller microvessels gave rise to endothelial cells, whereas the large microvessels gave rise to endothelial and smooth-muscle cells. The viability and progress of a microvessel toward derived cell proliferation seemed to be directly proportional to the number of mural cells present.
Insights
Researchers developed a method to culture cerebral vascular cells from mouse brains. Larger microvessels yielded both endothelial and smooth-muscle cells, while smaller ones produced only endothelial cells.
Area of Science:
- Neuroscience
- Cell Biology
- Vascular Biology
Background:
- Cerebral microvessels are crucial for brain function.
- Deriving pure populations of cerebral vascular endothelial and smooth-muscle cells is challenging.
- Understanding microvessel heterogeneity is key to cell culture optimization.
Purpose of the Study:
- To establish a method for deriving cerebral vascular endothelial and smooth-muscle cells from mouse forebrain microvessels.
- To develop a classification system for microvessels to predict cell outgrowth.
- To investigate the relationship between microvessel characteristics and cell proliferation.
Main Methods:
- Isolation of mouse forebrain microvessels using mechanical dispersion and filtration.
- Maintenance of microvessels in vitro as organoid cultures.
- Development of a microvessel classification system based on size, morphology, and proliferative potential.
- Assessment of cell viability and proliferation rates.
Main Results:
- A microvessel classification system was developed and validated for monitoring culture progress.
- Isolated microvessels exhibited heterogeneity in diameter (4-25 µm) and structure.
- All microvessel classes showed proliferative potential, influenced by class and density.
- Smaller microvessels primarily yielded endothelial cells, whereas larger ones produced both endothelial and smooth-muscle cells.
- Mural cell presence correlated positively with microvessel viability and proliferation.
Conclusions:
- A novel method for classifying and culturing cerebral microvessels was established.
- Microvessel size and mural cell content are critical determinants of cell derivation and proliferation.
- This approach facilitates the study of distinct cerebral vascular cell types in vitro.