MS-Driven Metabolic Alterations Are Recapitulated in iPSC-Derived Astrocytes

Area of Science:

• Neuroscience
• Cell Biology
• Metabolomics

Background:

• Astrocytes are crucial in multiple sclerosis (MS) pathology.
• Ethical limitations restrict studies on human astrocytes, often relying on animal models.
• Significant human and mouse cell differences necessitate patient-specific research.

Purpose of the Study:

• To characterize astrocytes from patients with MS (PwMS).
• To investigate mitochondrial function and cell metabolism in MS astrocytes.
• To establish a relevant in vitro model for MS research.

Main Methods:

• Generated induced pluripotent stem cell (iPSC)-derived astrocytes from PwMS and controls.
• Utilized electron microscopy, flow cytometry, gene expression, and metabolomics.
• Validated findings with single-nuclei RNA sequencing data.

Main Results:

• MS astrocytes showed enriched neurodegeneration genes and increased mitochondrial fission.
• Increased superoxide production, pro-inflammatory chemokine release, and altered glutamate handling were observed.
• Impaired amino acid catabolism and altered sphingolipid metabolism were identified, alongside increased oxidative stress.

Conclusions:

• iPSC-derived astrocytes from PwMS offer a powerful model for studying MS mechanisms.
• Findings provide mechanistic insights into astrocyte metabolic reprogramming in MS.
• Identified metabolic alterations represent potential therapeutic targets for MS.