NMDA receptor-dependent structural plasticity links early life stress to persistent aggression

Area of Science:

• Neuroscience
• Behavioral Science
• Molecular Biology

Background:

• Early life stress (ELS) is a significant risk factor for persistent aggression.
• ELS causes enduring changes in neural circuits regulating social behavior and aggression.
• Molecular and structural mechanisms underlying these persistent changes are not well understood.

Purpose of the Study:

• To review evidence implicating N-methyl-D-aspartate receptor (NMDAR)-dependent structural plasticity in aggression circuits.
• To propose a framework for understanding how ELS leads to persistent aggressive behavior.
• To explore the translational potential of targeting NMDAR-dependent plasticity.

Main Methods:

• Synthesis of clinical, postmortem, imaging, and preclinical evidence.
• Focus on the posterior ventral medial amygdala to ventrolateral ventromedial hypothalamus pathway.
• Examination of NMDAR signaling's role in synaptic remodeling.

Main Results:

• ELS increases dendritic spine density and excitatory synaptogenesis in aggression circuits.
• Synaptic input is biased to proximal locations, increasing neuronal excitability.
• This remodeling may lower the threshold for aggressive responses.

Conclusions:

• NMDAR-dependent structural plasticity offers a mechanism linking ELS to persistent aggression.
• Location-specific synaptic remodeling increases circuit excitability.
• Targeting NMDAR pathways may offer new therapeutic strategies for aggression post-ELS.