Quantitative aspects of glucose and glutamine metabolism by intestinal cells.
Level 5 - mechanism / opinion, no new human data
Narrative review and mechanistic analysis without primary clinical trial data
PubMed 8125383 · doi:10.1136/gut.35.1_suppl.s13
What was done
This paper is a narrative and mechanistic review applying metabolic control logic to examine glucose and glutamine utilization pathways, regulatory enzymes, and substrate cycling in enterocytes and gut wall cells under baseline physiological conditions and sepsis.
What was found
The abstract reports no quantitative values or statistical metrics. It describes qualitative pathway mechanisms: enterocytes rely primarily on arterial rather than luminal fuel supplies; enterocyte hexokinase activity is high, but glucose utilization is regulated by substrate cycling of glucose 6-phosphate back to glucose via glucose 6-phosphatase; glutamine is processed via glutaminase and transaminases to yield alanine, aspartate, and alpha-ketoglutarate; and in vitro preparations producing mainly alanine suggest enterocytes, rather than immune cells, drive most gut glutamine metabolism. High metabolic flux supports de novo purine, pyrimidine, and ribose synthesis, and rates decline during sepsis.
Why it matters
It outlines the biochemical logic of intestinal energy metabolism and nucleic acid precursor production, offering a framework for understanding how gut nutrient partitioning shifts during systemic inflammatory states.
Limits
The abstract provides no primary human experimental data, sample sizes, or quantitative measurements. Conclusions rely on theoretical control logic and in vitro gut preparations, which may not capture in vivo metabolic dynamics in human health and disease.
Cited by
- supports Glutamine is metabolized into glutamate for cellular energy and into alpha-ketoglutarate, which serves as an energy substrate for gut cells.