Human iPSC-Derived Cortical Neurons Display Homeostatic Plasticity

Area of Science:

• Neuroscience
• Cell Biology
• Developmental Biology

Background:

• Neuronal excitability is crucial for brain function.
• Homeostatic plasticity, a compensatory increase in excitatory synaptic strength, regulates neuronal activity.
• Limited data exist on human neuronal maturation and plasticity.

Purpose of the Study:

• To investigate homeostatic plasticity in human cortical networks at different developmental stages.
• To characterize the pre- and post-synaptic mechanisms underlying human neuronal plasticity.
• To establish a human in vitro model for studying neural plasticity.

Main Methods:

• Developed an in vitro cortical model using human-induced pluripotent stem cells.
• Chronically treated the neuronal model with tetrodotoxin to induce homeostatic plasticity.
• Analyzed changes in synaptic strength and protein expression at pre- and post-synaptic sites.

Main Results:

• Demonstrated the presence of homeostatic plasticity in human cortical networks.
• Identified both pre-synaptic (enhanced neurotransmitter release) and post-synaptic (increased post-synaptic density proteins) mechanisms.
• Observed increased expression of synaptic vesicle and post-synaptic density proteins.

Conclusions:

• Human cortical networks exhibit homeostatic plasticity involving pre- and post-synaptic adaptations.
• This plasticity is developmentally regulated in human neurons.
• The human iPSC-derived neuronal model is valuable for studying neural plasticity in health and disease.