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Glutamine metabolism and its physiologic importance.
1Joslin Diabetes Center, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts.
JPEN. Journal of Parenteral and Enteral Nutrition
|July 1, 1990
Summary
Glutamine, an abundant amino acid, plays unique metabolic roles. Research suggests it may be conditionally essential, especially during illness, prompting studies on its nutritional benefits.
Area of Science:
- Biochemistry
- Human Physiology
- Nutritional Science
Background:
- Glutamine is the most abundant free amino acid, vital for synthesizing proteins, nucleotides, and other molecules.
- It serves as a key precursor for ammoniagenesis, gluconeogenesis, and acts as an oxidative fuel for proliferating cells.
- Glutamine influences protein synthesis and degradation in muscle and glycogen synthesis in the liver.
Purpose of the Study:
- To explore the unique metabolic functions of glutamine.
- To evaluate the hypothesis that glutamine is a conditionally essential nutrient.
- To investigate the clinical utility of glutamine supplementation in disease states.
Main Methods:
- Review of existing literature on glutamine metabolism and function.
- Analysis of studies demonstrating changes in glutamine levels during catabolic states.
- Examination of research on glutamine-supplemented diets and their effects on tissue growth and nitrogen balance.
Main Results:
- Glutamine concentrations decrease and metabolism increases in catabolic and stressful conditions.
- Studies show trophic effects of glutamine supplementation on tissue growth and nitrogen balance.
- Evidence supports glutamine's role as a conditionally essential nutrient.
Conclusions:
- Glutamine's critical roles and its depletion in disease challenge its nonessential classification.
- The hypothesis of glutamine as a conditionally essential nutrient is supported by current research.
- Further research is needed to define the clinical benefits of glutamine-supplemented nutrition.