Light-activated insulin receptor modulates neuronal plasticity and cerebellar-driven behavior

Area of Science:

• Neuroscience
• Molecular Biology
• Optogenetics

Background:

• Insulin receptor signaling is crucial for neuronal function and plasticity.
• Dysregulated insulin signaling contributes to neurological disorders.
• Optogenetic tools offer precise spatiotemporal control over cellular pathways.

Purpose of the Study:

• To develop a novel optogenetic tool for controlling insulin receptor (IR) signaling.
• To investigate the role of light-activated IR signaling in neuronal plasticity.
• To explore the impact of modulated IR signaling on behavior.

Main Methods:

• Construction of InLOV: an insulin receptor fused to a light-sensitive LOV domain.
• In vitro and in vivo experiments to assess light-induced IR phosphorylation and downstream signaling.
• Behavioral studies in mice to evaluate the effects of InLOV activation on cerebellar-driven functions.

Main Results:

• InLOV successfully enabled light-induced phosphorylation of the insulin receptor's intracellular domains.
• Optogenetic activation of InLOV promoted insulin-induced neuronal plasticity in the mouse cerebellum.
• Enhanced cerebellar-driven self-motion behavior was observed upon InLOV light activation.

Conclusions:

• InLOV provides a powerful optogenetic method for modulating insulin receptor activity.
• This tool facilitates the study of insulin signaling in complex biological systems.
• InLOV holds potential for disease modeling and developing therapeutic strategies for metabolic and neurological conditions.