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Astrocytoma cell interaction with elastin substrates: implications for astrocytoma invasive potential
1Sonia and Arthur Labatt Brain Tumor Research Center, Division of Neurosurgery, The Hospital for Sick Children, Toronto, Ontario, Canada.
Glia
|January 16, 1999
Summary
Astrocytoma cells bind to and degrade elastin, a brain component. This interaction, mediated by the 67 kDa elastin binding protein (EBP), promotes astrocytoma invasion in brain tissue.
Area of Science:
- Neuroscience
- Biochemistry
- Oncology
Background:
- Elastin is present in the brain's meninges and microvasculature.
- The role of elastin in astrocytoma cell attachment and invasion is unknown.
- Astrocytoma cells produce tropoelastin and express the 67 kDa elastin binding protein (EBP).
Purpose of the Study:
- To investigate the interaction between astrocytoma cells and elastin.
- To determine if elastin influences astrocytoma cell adhesion, migration, and invasion.
- To characterize the role of the 67 kDa EBP in these processes.
Main Methods:
- In vitro adhesion assays using astrocytoma cell lines and elastin.
- Elastin degradation assays using tritiated-elastin.
- Organotypic cultures of human brain tissue to assess invasion.
- Inhibition studies using EDTA and alpha1-antitrypsin.
Main Results:
- Astrocytoma cells, particularly U87 MG, adhere to elastin substrates.
- Astrocytoma cells degrade and migrate through elastin membranes.
- Invasion of brain tissue organotypic cultures was enhanced by elastin degradation products (kappa-elastin).
- EDTA, but not alpha1-antitrypsin, inhibited elastin degradation.
Conclusions:
- Astrocytoma cells possess a functional 67 kDa EBP that binds to elastin.
- Elastin serves as a substrate for astrocytoma cell attachment.
- Elastin binding and degradation, potentially via EBP, contribute to astrocytoma invasion in the brain.