Patterns of cell death in the perinatal mouse forebrain

Area of Science:

• Neuroscience
• Developmental Biology
• Cell Biology

Background:

• Cell death is crucial for brain development, but triggers and timing remain unclear.
• Quantitative data on apoptosis during brain development is limited.
• Previous work established a postnatal cell death atlas in the mouse forebrain.

Purpose of the Study:

• To quantify apoptosis in 16 forebrain regions across perinatal ages (E17-P11).
• To investigate the impact of birth on neuronal cell death.
• To identify brain regions with significant perinatal cell elimination.

Main Methods:

• Quantification of activated caspase-3 (AC3) to measure apoptosis.
• Analysis of cell death in 16 forebrain regions from embryonic day 17 to postnatal day 11.
• Comparison of cell death in vaginally delivered versus in-utero fetuses.

Main Results:

• Apoptosis peaks shortly after birth in most analyzed brain regions.
• Vaginal birth was associated with increased cell death in some regions compared to in-utero controls.
• Massive cell death observed in the hippocampus (P1) and corpus callosum regions (E18).
• Absence of Bax gene prevented perinatal cell death in specific regions.

Conclusions:

• Birth may act as a significant trigger for neuronal cell death during brain development.
• Specific transient cell populations undergo elimination perinatally.
• This study provides a detailed temporal map of perinatal apoptosis in the developing brain.