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Expression of apoptosis-inducing factor during early neural differentiation in the chick embryo
1Department of Physiology, University of Alberta, Edmonton, Alberta, Canada T6G 1Y6.
Insights
Apoptosis-inducing factor (AIF) is found in developing chick embryo motor roots, suggesting its role in neuronal cell death. Survival factors may regulate AIF activity to control this process.
Area of Science:
- Developmental biology
- Neuroscience
- Cell biology
Background:
- Apoptosis-inducing factor (AIF) is a key mediator of programmed cell death.
- Understanding AIF's role in embryonic development is crucial for comprehending neuronal development and cell death pathways.
Purpose of the Study:
- To investigate the distribution and localization of AIF in the developing chick embryo nervous system.
- To explore the potential involvement of AIF in neuronal cell death during early embryonic development.
Main Methods:
- Immunohistochemistry was used to detect AIF immunoreactivity in chick embryos at embryonic day 4.
- Co-localization studies were performed using monoclonal antibodies HNK-1 and 1E8 to identify specific cell types expressing AIF.
Main Results:
- AIF immunoreactivity was predominantly observed in the cytoplasm of ventral motor root cells at their neural tube insertion points.
- Co-localization with HNK-1 and 1E8 suggested AIF presence in Schwann cell precursors and nerve fibers.
- AIF was notably absent in neural tube cell bodies and surrounding somitic tissue.
Conclusions:
- The findings support the hypothesis that AIF plays a role in developmental neuronal cell death.
- Target-derived neuronal survival factors may influence neuronal survival by modulating AIF activity.
Abstract:
The distribution of apoptosis-inducing factor (AIF) immunoreactivity has been studied in the developing somites and nervous system of the chick embryo at embryonic day 4. AIF was found to be expressed primarily in the cytoplasm of cells of the ventral motor roots, at the points of their insertion into the neural tube. Co-localization of mitochondrial AIF immunoreactivity with the epitopes recognized by the monoclonal antibodies HNK-1 and 1E8 suggests that the AIF may be present in Schwann cell precursors as well as in nerve fibres. AIF immunoreactivity was not observed in either cell bodies in the neural tube, or in the somitic tissue surrounding the ventral roots. The results are consistent with the hypothesis that AIF may be involved in neuronal cell death during development, and that target-derived neuronal survival factors may act by controlling AIF activity.