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Beta-keratin expression in avian tongue cell aggregates
W E Carver1, L W Knapp, R H Sawyer
1University of South Carolina, Department of Biological Sciences, Columbia 29208.
The Journal of Experimental Zoology
|December 1, 1990
Summary
Early embryonic tongue cells from anterior and posterior regions differentiate into distinct epithelial tissues in vitro. Anterior ventral cells produce beta-keratins, while posterior ventral cells produce alpha-keratins, mirroring in vivo development.
Area of Science:
- Developmental Biology
- Cell Biology
- Tissue Engineering
Background:
- Understanding embryonic tongue development is crucial for regenerative medicine and treating congenital anomalies.
- Cellular differentiation and histogenesis in embryonic tissues involve complex molecular signaling pathways.
- Keratins serve as important markers for epithelial differentiation and regional identity.
Purpose of the Study:
- To investigate the in vitro histotypic reorganization and terminal differentiation capacity of embryonic tongue cells from distinct anatomical regions.
- To determine if regional differences in embryonic tongue cells are maintained during in vitro culture and differentiation.
- To analyze the expression patterns of alpha- and beta-keratins as markers of differentiation in engineered tongue tissue constructs.
Main Methods:
- Rotation-mediated aggregation was employed to culture dissociated cells from embryonic day 12 anterior ventral (AV) and posterior ventral (PV) tongue surfaces.
- Cells were cultured for 6 days, followed by fixation and paraffin embedding for histological analysis.
- Indirect immunofluorescence microscopy was utilized to detect and localize beta-keratin expression, a marker for terminal differentiation.
Main Results:
- AV cell aggregates formed stratified epithelia expressing beta-keratins, indicating differentiation towards a specific epithelial subtype.
- PV cell aggregates formed stratified epithelia expressing only alpha-keratins.
- The observed keratin expression patterns in vitro recapitulated the temporal and regional specificity seen during in vivo tongue development.
Conclusions:
- Embryonic tongue cells possess intrinsic regional specification that directs their differentiation pathways in vitro.
- Rotation-mediated aggregation is a viable method for generating histotypically organized and differentiated embryonic tongue tissue constructs.
- This study provides insights into the cellular mechanisms underlying tongue morphogenesis and keratinization.