Force-generating apoptotic cells orchestrate avian neural tube bending

Area of Science:

• Developmental Biology
• Cell Biology
• Biophysics

Background:

• Apoptosis is crucial for development, but its role in vertebrate morphogenesis is unclear.
• Recent findings suggest apoptotic cells can influence their environment.
• Impaired apoptosis causes neural tube defects in vertebrates, but mechanisms are unknown.

Purpose of the Study:

• To investigate the contribution of apoptosis to vertebrate morphogenesis.
• To elucidate the cellular mechanisms by which apoptosis impacts neural tube formation.

Main Methods:

• Utilized avian embryos to study neural tube closure.
• Observed apoptotic cells within the neuro-epithelium.
• Analyzed the forces generated by apoptotic cells.

Main Results:

• Apoptotic cells generate an apico-basal force before extrusion.
• This force, mediated by actomyosin, drives nuclear fragmentation.
• Apoptotic forces influence neighboring tissues and contribute to neural tube bending.

Conclusions:

• The neuro-epithelium senses the mechanical impact of apoptotic cells.
• Cumulative apoptotic forces actively contribute to neural tube bending.
• Apoptosis plays a significant mechanical role in vertebrate morphogenesis.