Role of glutamine in immunologic responses

Area of Science:

• Biochemistry
• Immunology
• Nutrition Science

Background:

• Glutamine is traditionally classified as a nonessential amino acid.
• Emerging data indicates glutamine's essential role in inflammatory conditions like infection and injury.
• It serves as a critical fuel source for rapidly dividing cells, including inflammatory cells and enterocytes.

Purpose of the Study:

• To evaluate the essentiality of glutamine during inflammatory states.
• To explore the potential benefits of glutamine supplementation in metabolically compromised patients.
• To highlight glutamine's role beyond immunomodulation in host protection.

Main Methods:

• Review of laboratory and clinical data on glutamine metabolism and function.
• Analysis of animal and human studies investigating glutamine supplementation.
• Assessment of glutamine's impact on cell proliferation, inflammatory cell function, and enterocyte metabolism.

Main Results:

• Inflammatory conditions can lead to increased glutamine consumption, potentially causing a relative deficiency.
• Adequate tissue concentrations of glutamine, achieved through appropriate dosing and routes, may improve patient outcomes.
• Supplementation can mitigate nutritional inadequacies associated with conventional nutrition during critical illness.

Conclusions:

• Glutamine may be conditionally essential in critical illness, infection, and injury.
• Optimizing glutamine levels supports anabolic processes and host defense mechanisms.
• Supplementing glutamine offers multifaceted benefits, including immunomodulation and enhanced cell function, for metabolically compromised individuals.