Spatially Resolved Bioenergetic and Genetic Reprogramming Through the Brain of Rats Bearing Implanted C6 Gliomas As...

Area of Science:

• Neuroscience
• Metabolic research
• Genomics

Background:

• C6 gliomas in rats exhibit metabolic reprogramming.
• Understanding the spatial relationship between metabolic and genetic changes is crucial.

Purpose of the Study:

• To investigate the regional metabolic shift from oxidative to glycolytic phenotype in C6 gliomas.
• To correlate these metabolic changes with altered gene expression in adjacent brain biopsies.
• To explore the in situ colocalization of metabolic and genetic alterations.

Main Methods:

• Utilized proton (¹H) and carbon-13 (¹³C) High-Resolution Magic Angle Spinning (HRMAS) spectroscopy.
• Performed quantitative gene expression analysis on adjacent brain biopsies from tumor-bearing rats.
• Administered [1-¹³C]-glucose to track metabolic pathways.

Main Results:

• Glycolytic metabolism, indicated by lactate labeling, increased towards the tumor core.
• Oxidative metabolism, shown by glutamate labeling, decreased from healthy tissue to the tumor.
• Metabolic shifts correlated with changes in Hypoxia-Inducible Factor (HIF) genes (HIF1α, HIF2α, HIF3α) and related metabolic genes.
• Metabolic and genetic alterations were found to colocalize within the brain tissue.

Conclusions:

• Metabolic reprogramming in C6 gliomas involves a shift towards glycolysis.
• Gene expression alterations spatially parallel these metabolic changes in situ.
• Metabolomic profiles obtained via multinuclear HRMAS can infer regional genetic alterations in brain tumors.