BAK alters neuronal excitability and can switch from anti- to pro-death function during postnatal development

Area of Science:

• Neuroscience
• Cell Biology
• Molecular Biology

Background:

• BAK is a pro-apoptotic protein belonging to the BCL-2 family, known to localize at mitochondria.
• The precise role of BAK in neuronal injury and death remains incompletely understood.
• Understanding BAK's function is critical for developing therapeutic strategies against neurological disorders.

Purpose of the Study:

• To investigate the multifaceted role of BAK in various mouse models of neuronal injury.
• To determine how BAK's function in neuronal death varies with different stimuli, neuron types, and developmental stages.
• To explore BAK's potential involvement in regulating synaptic activity and neurotransmitter release.

Main Methods:

• Utilized multiple mouse models of neuronal injury, including viral infection, Parkinson's disease, ischemia/stroke, and seizures.
• Examined BAK's pro- or anti-apoptotic function in response to diverse neuronal insults.
• Assessed the impact of BAK on neuronal excitability and neurotransmitter release.

Main Results:

• BAK's function is context-dependent, either promoting or inhibiting neuronal death based on the stimulus, neuron subtype, and developmental stage.
• BAK demonstrated protective effects against excitotoxicity and viral infection in hippocampal neurons.
• In mature mice, BAK's role shifted to pro-death in virus-infected spinal cord neurons.
• BAK also conferred protection against kainate-induced seizures, indicating a role in synaptic regulation.
• BAK was observed to modulate neurotransmitter release, aligning with its protective neuronal effects.

Conclusions:

• BAK plays a complex and dynamic role in neuronal cell death and survival.
• BAK's function is significantly influenced by the specific context of neuronal injury and development.
• These findings suggest BAK's involvement in regulating neuronal excitability, offering potential therapeutic insights.