Panx1a modulates metabolic stress signaling and synaptic composition in the developing zebrafish brain

Area of Science:

• Neuroscience
• Molecular Biology
• Developmental Biology

Background:

• Pannexin 1a (Panx1a) is a neuronal ATP channel involved in neurodevelopment.
• Its role in maintaining synaptic homeostasis under metabolic stress is not well understood.

Purpose of the Study:

• To investigate the function of Panx1a in coordinating synaptic and metabolic processes in the developing zebrafish brain.
• To determine the impact of Panx1a loss on neural circuit stability and cellular responses to metabolic stress.

Main Methods:

• Utilized a genetic Panx1a knockout zebrafish model.
• Induced oxidative stress using MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine).
• Performed molecular analyses (gene expression, signaling pathways), electrophysiology, and assessed neuronal cell death.

Main Results:

• Panx1a knockout exacerbated metabolic alterations and reduced extracellular ATP.
• Loss of Panx1a activated AMPK-mTORC1 signaling, autophagy, and apoptosis.
• Impaired synaptic gene expression, increased neuronal death (tectum, pallium), and aberrant brain network activity were observed.
• Panx1a knockout larvae showed reduced network adaptability and impaired local field potential coherence.

Conclusions:

• Panx1a is a critical regulator of the metabolic-synaptic interface during early brain development.
• Panx1a deficiency contributes to cellular and network dysfunction under metabolic stress.
• Ablation of Panx1a may be implicated in the pathophysiology of neurodevelopmental disorders.