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Hensen's node regulates avian neural crest differentiation in vitro
1Department of Biological Structure and Function, Oregon Health Sciences University, Portland 97201, USA.
Journal of Neurobiology
|February 1, 1996
Summary
Hensen's node influences neural crest cell development. Young Hensen's node can alter trunk neural crest cell phenotypes, promoting cranial-specific traits and inhibiting trunk-specific ones.
Area of Science:
- Developmental biology
- Embryology
- Cell fate determination
Background:
- Neural crest cells exhibit regional specificity in cell type production.
- Anteroposterior (AP) patterning of neural crest fates is established before cell migration.
- Hensen's node is a key signaling center in early embryonic development.
Purpose of the Study:
- To investigate if Hensen's node regulates neural crest cell fates.
- To determine the effect of Hensen's node signaling on cranial and trunk neural crest phenotypes.
Main Methods:
- Transfilter co-culture system to study cell interactions.
- Analysis of specific cell phenotypes using immunoreactivity (fibronectin, smooth muscle actin) and melanin synthesis.
- Assessment of cell proliferation in response to Hensen's node signaling.
Main Results:
- Young Hensen's node (stages 3-4) induced cranial-specific phenotypes (fibronectin, smooth muscle actin) in trunk neural crest cells.
- Young Hensen's node down-regulated trunk-specific melanin synthesis in neural crest cells.
- The inductive capacity of Hensen's node diminished with age, disappearing by stage 6.
- Old Hensen's node did not induce trunk-specific phenotypes in cranial neural crest cells.
Conclusions:
- Hensen's node plays a role in specifying neural crest cell fates.
- Early Hensen's node signaling can modify trunk neural crest cell phenotype towards a cranial identity.
- Cranial and trunk neural crest phenotypes are likely regulated by distinct inductive mechanisms.