Metabolic Reprogramming of Oligodendrocytes in Intrauterine Growth Restriction

Area of Science:

• Neuroscience
• Developmental Biology
• Mitochondrial Biology

Background:

• Intrauterine growth restriction (IUGR) is linked to white matter injury (WMI) and neurodevelopmental disabilities like cerebral palsy.
• Sexual dimorphism in WMI in IUGR suggests underlying sex-specific mechanisms.
• Energy failure is a suspected contributor to WMI in IUGR.

Purpose of the Study:

• To investigate sex-specific alterations in oligodendrocyte (OL) differentiation and transcriptome in a mouse model of IUGR.
• To assess mitochondrial respiration in OLs from IUGR mice.

Main Methods:

• Utilized a placental insufficiency-induced IUGR mouse model.
• Employed cell-specific epitope tagging and RNA isolation to analyze OL transcriptome.
• Assessed OL mitochondrial respiration using Agilent Seahorse technology.

Main Results:

• Observed sex-specific arrest of OL differentiation in IUGR females, with later catch-up.
• Found downregulation of oxidative phosphorylation (OXPHOS) genes in IUGR.
• IUGR males exhibited greater downregulation of electron transport chain (ETC) genes and proteins, with reduced mitochondrial respiration and ATP generation compared to IUGR females.

Conclusions:

• Demonstrated sex-specific differences in OL differentiation and mitochondrial metabolism in IUGR.
• These findings offer insights into sex-specific neurodevelopmental outcomes in IUGR.
• Provides a basis for developing targeted interventions for IUGR-related WMI.