Metabolic adaptations direct cell fate during tissue regeneration

Area of Science:

• Cell Biology
• Metabolism
• Regenerative Medicine

Background:

• Cell-fate specification is primarily linked to transcriptional regulation.
• Emerging evidence suggests intermediary metabolism molecules also play a role.
• α-ketoglutarate (αKG) links the tricarboxylic acid (TCA) cycle to chromatin modification.

Purpose of the Study:

• To investigate the role of TCA-cycle metabolites in intestinal cell fate during homeostasis and regeneration.
• To determine if TCA-cycle enzymes regulate cell differentiation in the intestine.
• To explore the therapeutic potential of targeting metabolic pathways in regenerative medicine.

Main Methods:

• Analysis of TCA-cycle enzyme expression in the intestine.
• Utilizing genetically modified mouse models and intestinal organoids.
• Investigating the function of 2-oxoglutarate dehydrogenase (OGDH) in different intestinal cell lineages.

Main Results:

• TCA-cycle enzyme expression is heterogeneous in the intestine, with OGDH components upregulated in absorptive and downregulated in secretory lineages.
• OGDH exhibits lineage-specific roles: essential for absorptive enterocyte bioenergetics and stimulated by its downregulation in secretory cells.
• Inhibition of OGDH or αKG supplementation promoted secretory cell differentiation and healing in colitis models.

Conclusions:

• OGDH dependency is lineage-specific and regulates intestinal cell fate.
• Metabolic regulation of OGDH is crucial for intestinal homeostasis and regeneration.
• Targeting OGDH offers potential therapeutic strategies for regenerative medicine in the gut.