Neuropeptide Signaling is Required to Implement a Line Attractor Encoding a Persistent Internal Behavioral State.

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Molecular Neuroscience

Background:

• Internal states critically influence survival behaviors, yet their underlying neural mechanisms remain largely unknown.
• A recently identified line attractor in the ventromedial hypothalamus (VMH) represents the internal state of aggressiveness.
• The precise mechanisms for implementing line attractors, particularly the role of neuromodulatory signaling, require further investigation.

Approach:

• Utilized a novel approach combining cell type-specific, anatomically restricted CRISPR/Cas9 gene editing with microendoscopic calcium imaging.
• Investigated the necessity of neuropeptidergic signaling for line attractor dynamics in VMH Esr1+ neurons.
• Examined the effects of co-disrupting oxytocin and vasopressin receptors on neural activity and aggressive behavior.

Key Points:

• Co-disruption of oxytocin and vasopressin receptors in adult VMH Esr1+ neurons suppressed attack behavior.
• This genetic manipulation reduced persistent neural activity and abolished line attractor dynamics.
• The observed effects on line attractor dynamics were achieved with only modest impacts on overall neural activity and sex/behavior-tuning.

Conclusions:

• Neuropeptidergic signaling, specifically involving oxytocin and vasopressin, is requisite for the implementation of behaviorally relevant line attractors.
• This study highlights the critical role of neuromodulation in shaping neural representations of internal states.
• The integrated methodology provides a powerful framework for mechanistic neuroscience research across multiple levels of biological organization.