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Related Experiment Videos

Arginine and immunity.

Petar J Popovic1, Herbert J Zeh, Juan B Ochoa

  • 1Department of Surgery, University of Pittsburgh Medical School, Pittsburgh, PA 15213, USA.

The Journal of Nutrition
|May 22, 2007
PubMed
Summary
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Dietary arginine supplementation

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Dietary arginine supplementation is controversial due to a lack of understanding of its role in immune function.
  • Arginine metabolism in myeloid cells involves inducible nitric oxide synthases (iNOS) and arginase 1, influenced by T helper 1 or 2 cytokines.
  • Myeloid suppressor cells (MSC) expressing arginase are implicated in trauma, sepsis, infections, and cancer.

Purpose of the Study:

  • To clarify the role of arginine in immune function and resolve controversies surrounding its supplementation.
  • To investigate the impact of myeloid suppressor cells on arginine levels and T-cell function.
  • To understand how arginine metabolism in myeloid cells relates to different inflammatory responses.

Main Methods:

  • Analysis of arginine metabolism pathways in myeloid cells.

Related Experiment Videos

  • Investigation of arginase 1 and inducible nitric oxide synthases (iNOS) activation.
  • Assessment of myeloid suppressor cells (MSC) in disease models and patient samples.
  • Evaluation of T-cell proliferation and function in the presence of MSC.

    • Main Results:

    • MSC expressing arginase deplete arginine, potentially causing systemic deficiency and affecting T-cell function.
    • Arginase 1 expression is elevated in myeloid cells in conditions like cancer, trauma, and sepsis.
    • T-cells exhibit impaired proliferation and reduced zeta-chain expression when cocultured with MSC, mirroring observations in cancer and trauma patients.

    Conclusions:

    • Myeloid suppressor cells play a critical role in arginine homeostasis and immune regulation.
    • Arginine depletion by MSC contributes to T-cell dysfunction observed in various diseases.
    • Further research into arginine metabolism and MSC function could lead to safer and more effective immune-boosting strategies.