CO and NO Coordinate Developmental Neuron Migration.

Area of Science:

• Neuroscience
• Developmental Biology
• Cell Signaling

Background:

• Nitric oxide (NO) and carbon monoxide (CO) are gaseous signaling molecules that activate soluble guanylyl cyclase (sGC) to produce cyclic guanosine monophosphate (cGMP).
• While NO is a well-established stimulator of enteric neuron migration, the role of CO in this process, particularly its interaction with NO signaling, remains less understood.

Purpose of the Study:

• To investigate the interaction between NO and CO signaling pathways in the context of enteric nervous system development.
• To elucidate the distinct roles of NO and CO in regulating enteric neuron migration and collective cell movement during embryogenesis.

Main Methods:

• Utilized locust embryos as an invertebrate model system to study enteric nervous system development.
• Employed NO donors and CO application to assess their effects on enteric neuron migration and cGMP production.
• Quantified interneuronal distance and used time-lapse microscopy to analyze neuronal directionality and motility.

Main Results:

• NO stimulation led to widespread cGMP production and promoted enteric neuron migration.
• CO application resulted in less efficient cGMP production (approximately 33% of neurons) and acted as an inhibitory signal.
• CO was found to increase interneuronal distance and reduce the directionality of migrating neurons, suggesting an antagonistic role to NO.

Conclusions:

• NO and CO function as antagonistic signals coordinating collective cell migration during enteric nervous system development.
• Locust embryos serve as a valuable model for studying basic neurodevelopmental processes and for screening compounds affecting neuronal motility and NO/CO signaling pathways.