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Chondroitin 4-
Huiqian Huang1,2, Amélie M Joffrin1, Yuan Zhao3
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125.
Summary
Altered brain chondroitin sulfate (CS) 4-O-sulfation impacts perineuronal nets, affecting anxiety and social memory. Targeting CS 4-O-sulfation may help treat related cognitive disorders.
Area of Science:
- Neuroscience
- Glycobiology
- Molecular Biology
Background:
- Glycan alterations are linked to aging and neurodegenerative diseases.
- Specific glycan roles in emotion and cognition are largely unknown.
- Chondroitin sulfate (CS) is a key component of the extracellular matrix in the brain.
Purpose of the Study:
- To investigate the role of 4-O-sulfated CS in regulating perineuronal nets (PNNs) and synapse development.
- To determine the impact of CS 4-O-sulfation on anxiety and social memory in mice.
- To explore therapeutic potential of targeting CS 4-O-sulfation for neuropsychiatric disorders.
Main Methods:
- Utilized a combination of chemistry and neurobiology techniques.
- Generated mice with brain-specific deletion of CS 4-O-sulfation.
- Performed selective ablation of CS 4-O-sulfation in the adult CA2 region.
- Employed enzymatic pruning and chemical manipulation of CS 4-O-sulfation levels.
Main Results:
- Deletion of CS 4-O-sulfation increased PNN densities in the hippocampus (CA2 region).
- This led to imbalanced synaptic ratios, reduced CREB activation, elevated anxiety, and social memory deficits.
- Enzymatic PNN pruning reduced anxiety and restored social memory.
- Chemical modulation of CS 4-O-sulfation reversibly altered PNN densities and synaptic balance.
Conclusions:
- CS 4-O-sulfation is a critical regulator of PNNs and synapse development in the adult brain.
- It plays a key role in adult brain plasticity, social memory, and anxiety regulation.
- Targeting CS 4-O-sulfation may offer a novel therapeutic strategy for social cognitive dysfunction in neuropsychiatric and neurodegenerative diseases.
