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Apoptosis in early ocular morphogenesis in the mouse
L K Laemle1, M Puszkarczuk, R N Feinberg
1Department of Anatomy, Cell Biology and Injury Sciences, UMDNJ, New Jersey Medical School, Newark 07103, USA. laemlelb@umdnj.edu
Abstract:
Development of the eye requires complex interactions between tissues, extracellular matrix and growth factors. Most cells of the optic primordia grow and differentiate into discrete ocular structures; however, other cells have death as their developmental fate. The most common mechanisms of cell death are apoptosis and necrosis. We have identified the cell death that occurs during ocular morphogenesis in ZRDCT-N mice as apoptosis. Mouse embryos, ages E8.5-E11.5, were embedded in paraffin, sectioned at 5 microns and stained with hematoxylin or by the terminal deoxytransferase-mediated dUTP-biotin nick end-labeling (TUNEL) method. The spatial and temporal distribution of apoptotic cells was mapped at 0.5 day intervals using a computerized image analysis system, and 3-D reconstructions were made at each embryonic age. Our data indicate that apoptosis plays a role in normal ocular morphogenesis and provides the groundwork for studies of abnormal ocular development.
Insights
Apoptosis, a form of programmed cell death, is crucial for normal eye development in ZRDCT-N mice. This study maps the timing and location of apoptotic cells during ocular morphogenesis.
Area of Science:
- Developmental Biology
- Ophthalmology
- Cell Biology
Background:
- Eye development involves intricate interactions between tissues, extracellular matrix, and growth factors.
- Cellular development can lead to differentiation or programmed cell death, primarily apoptosis or necrosis.
- Understanding cell death mechanisms is vital for studying normal and abnormal ocular development.
Purpose of the Study:
- To identify the mechanism of cell death during ocular morphogenesis in ZRDCT-N mice.
- To map the spatial and temporal distribution of apoptotic cells during eye development.
- To establish a foundation for investigating abnormal ocular development.
Main Methods:
- Mouse embryos (E8.5-E11.5) were processed using paraffin embedding and sectioning.
- Tissues were stained with hematoxylin or subjected to terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay.
- Computerized image analysis and 3-D reconstructions were utilized to map apoptotic cell distribution.
Main Results:
- Apoptosis was identified as the primary mechanism of cell death during ocular morphogenesis in ZRDCT-N mice.
- The study mapped the precise timing and location of apoptotic cells throughout embryonic eye development.
- Detailed 3-D reconstructions provided insights into the role of apoptosis in shaping ocular structures.
Conclusions:
- Apoptosis plays a significant role in normal ocular morphogenesis.
- This research provides essential data for future studies on congenital eye abnormalities.
- The findings highlight the importance of programmed cell death in establishing proper eye anatomy.
