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A comparison of secondary palate development with different in vitro techniques
Abstract:
Palatal processes from 14-day fetal C57BL mice were cultured under varying conditions for 48 hours and prepared for light and electron microscopy. Disruption of the epithelium along the medial border occurred when single palatal processes were explanted onto Millipore filters, plasma clots, or lens paper in subjacent contact with nutrient medium. Paired processes under the same culture conditions demonstrated typical midline epithelial disruption and mesenchymal fusion. Regions of mesenchymal necrosis occurred in processes grown on nutrient agar in a dish or submerged in nutrient medium. In similar cultures medial epithelial disruption did not occur in single processes and mesenchymal fusion of paired processes was either delayed or did not occur. Disruption of the epithelium along the medial border in single palatal processes, and mesenchymal fusion in paired palatal processes, occurred when palates were grown on nutrient agar supported above but in contact with nutrient medium. The results indicated that responses of palatal epithelium and mesenchyme may be altered by different in vitro procedures. These observations emphasize that many factors must be considered in interpreting developmental changes in palatal processes grown in vitro.
Insights
In vitro culture conditions significantly impact mouse palatal development. Nutrient medium contact and support alter epithelial disruption and mesenchymal fusion in palatal processes.
Area of Science:
- Developmental Biology
- Cell Biology
- Histology
Background:
- Palatal fusion is a critical developmental process.
- Understanding in vitro influences on palatal development is essential for accurate research.
Purpose of the Study:
- To investigate how varying in vitro culture conditions affect the development of mouse palatal processes.
- To determine the impact of nutrient medium contact and support on epithelial and mesenchymal responses.
Main Methods:
- Culturing 14-day fetal mouse palatal processes under diverse conditions for 48 hours.
- Utilizing light and electron microscopy for detailed observation.
- Manipulating substrate (Millipore filters, plasma clots, lens paper, nutrient agar) and medium contact.
Main Results:
- Single palatal processes showed epithelial disruption when in direct contact with nutrient medium via filters, clots, or paper.
- Paired processes exhibited typical midline epithelial disruption and mesenchymal fusion under similar conditions.
- Mesenchymal necrosis occurred in processes grown submerged in medium or on agar within a dish.
- Epithelial disruption was absent in single processes, and fusion was delayed/absent in paired processes when grown on agar submerged in medium.
- Both epithelial disruption (single processes) and mesenchymal fusion (paired processes) occurred when palates were on agar supported above nutrient medium.
Conclusions:
- In vitro culture procedures significantly alter the developmental responses of palatal epithelium and mesenchyme.
- Factors such as substrate, medium contact, and support are crucial for interpreting in vitro developmental changes in palatal processes.