Betaine ameliorates schizophrenic traits by functionally compensating for KIF3-based CRMP2 transport

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Schizophrenia (SCZ) involves neuronal morphological changes with unclear molecular causes.
• KIF3 motor deficiency is implicated in SCZ-like behaviors and neuronal abnormalities.

Purpose of the Study:

• To investigate the molecular mechanism underlying SCZ-related neuronal morphogenesis.
• To evaluate the therapeutic potential of betaine in an SCZ mouse model.

Main Methods:

• Utilized Kif3b+/- mice exhibiting SCZ-like behaviors.
• Administered a high-betaine diet to assess its effects on neuronal structure and behavior.
• Analyzed collapsin response mediator protein 2 (CRMP2) transport and lamellipodial dynamics.

Main Results:

• Betaine diet significantly reduced SCZ-like traits in Kif3b+/- mice.
• Identified impaired CRMP2 transport due to KIF3 deficiency causing reduced lamellipodial dynamics and neurite hyperbranching.
• Betaine decreased CRMP2 carbonylation, enhancing F-actin bundling and compensating for KIF3 deficiency.

Conclusions:

• KIF3 deficiency and impaired CRMP2 transport contribute to SCZ pathogenesis.
• Betaine administration shows potential for alleviating SCZ by restoring neuronal morphogenesis.
• Findings suggest a novel therapeutic strategy for schizophrenia involving betaine.