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Extracellular matrix effects on neurosphere cell motility
S M Kearns1, E D Laywell, V K Kukekov
1Department of Neuroscience, The McKnight Brain Institute, and the University of Florida Shands Cancer Center, and the Program in Stem Cell Biology and Regenerative Medicine, Gainesville, FL 32610, USA.
Experimental Neurology
|June 25, 2003
Summary
Extracellular matrix molecules like laminin and fibronectin enhance neural stem cell migration and outgrowth. Chondroitin sulfate proteoglycan, however, inhibits these processes, suggesting a role in regulating cell movement.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Limited understanding of extracellular matrix (ECM) roles in neural stem and progenitor cell growth and differentiation.
- Established presence of astrocyte-derived ECM in neurogenic regions like the subependymal zone and rostral migratory stream.
- Neurospheres derived from these regions show multipotency, but ECM regulation remains unclear.
Purpose of the Study:
- To investigate the effects of specific ECM components on cerebellar-derived neurospheres.
- To determine how laminin, fibronectin, and chondroitin sulfate proteoglycan influence neural stem cell behavior.
Main Methods:
- Culturing cerebellar-derived neurospheres.
- Assessing neurosphere behavior on substrates coated with laminin, fibronectin, and chondroitin sulfate proteoglycan.
- Measuring cell migration velocity and cellular outgrowth.
Main Results:
- Laminin and fibronectin significantly increased neural stem cell migration velocity compared to chondroitin sulfate proteoglycan.
- Fibronectin maximized migration velocity at 48 hours, while laminin and chondroitin sulfate proteoglycan required 72 hours.
- Laminin and fibronectin supported extensive cellular outgrowth, whereas chondroitin sulfate proteoglycan inhibited it.
- No significant effect on neuronal or glial fate choice was observed.
Conclusions:
- Extracellular matrix molecules differentially regulate neural stem cell migration and outgrowth.
- Laminin and fibronectin promote cell movement and process extension.
- Chondroitin sulfate proteoglycan acts as an inhibitor of migration and outgrowth.
- ECM molecules likely modulate cell movement and process outgrowth in neural development rather than fate choice.