Construction of a Brain-specific SLC23A2 Gene Knockout Mice Model

Area of Science:

• Neuroscience
• Developmental Biology
• Biochemistry

Background:

• Vitamin C (VC) is a vital antioxidant in the Central Nervous System (CNS).
• SLC23A2 (SVCT2) is the sole transporter responsible for actively importing VC into the brain.
• The precise role of VC in fetal brain development remains unclear due to limitations in existing animal models.

Purpose of the Study:

• To establish a conditional knockout mouse model for SLC23A2 (SVCT2) specifically in the brain.
• To investigate the impact of brain-specific VC deficiency on neurodevelopment and related molecular pathways.
• To provide a valuable tool for studying VC's neuroprotective effects during fetal development.

Main Methods:

• Utilized CRISPR/Cas9 technology to generate a floxed SLC23A2 mouse model.
• Crossbred with Glial fibrillary acidic protein-driven Cre Recombinase (GFAP-Cre) mice to create a brain-specific conditional knockout (GFAP-Cre;SLC23A2 flox/flox).
• Analyzed gene and protein expression (SVCT2, NeuN, GFAP, BDNF, Iba-1), oxidative stress markers (GSH, MDA, 8-isoprostane), and inflammatory cytokines (TNF-α, IL-6).

Main Results:

• Successfully generated a conditional knockout mouse model with significantly reduced SVCT2 expression in the brain.
• Observed down-regulation of neuronal and glial markers (NeuN, GFAP, BDNF) and up-regulation of microglial marker (Iba-1).
• Detected increased oxidative stress and inflammation markers (GSH, MDA, 8-isoprostane, TNF-α, IL-6) and decreased brain VC levels.

Conclusions:

• The study successfully established a novel mouse model for brain-specific SVCT2 knockout using CRISPR/Cas9.
• This model demonstrates that reduced brain Vitamin C levels induce oxidative stress and inflammation, affecting key neurodevelopmental proteins.
• The findings highlight Vitamin C's crucial protective role against oxidative stress and inflammation during fetal brain development.