Intersectin1/cdc42 signaling regulates methamphetamine-induced neuronal remodeling in the hippocampus

Area of Science:

• Neuroscience
• Molecular Biology
• Addiction Research

Background:

• Drug addiction involves brain adaptations, with the hippocampus crucial for drug-context associations and relapse.
• The actin cytoskeleton and its regulators are implicated in the plasticity underlying drug use.
• Mechanisms driving methamphetamine-induced brain changes remain incompletely understood.

Purpose of the Study:

• To investigate the molecular pathways mediating methamphetamine-induced morphological and functional adaptations in the hippocampus.
• To identify specific signaling pathways involved in synaptic plasticity alterations caused by methamphetamine.

Main Methods:

• Used primary hippocampal neuron cultures and RNA sequencing from somatic and neuritic compartments.
• Employed FRET microscopy, biochemical analyses, and morphometric measurements.
• Utilized adeno-associated virus (AAV)-mediated depletion of cdc42 in vivo.

Main Results:

• Binge methamphetamine administration increased hippocampal neurite outgrowth and dendritic spine density.
• Methamphetamine augmented basal synaptic transmission and impaired long-term potentiation (LTP).
• The intersectin 1 (Itsn1)/cdc42 signaling pathway was identified as a key mediator of these methamphetamine-induced synaptic adaptations.
• Neuronal cdc42 depletion prevented methamphetamine-induced cytoarchitectural and functional changes.

Conclusions:

• The Itsn1/cdc42 pathway critically regulates methamphetamine-induced neuronal remodeling and plasticity in a compartment-specific manner.
• Targeting the Itsn1/cdc42 pathway may offer novel strategies for treating methamphetamine addiction.