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Updated: Sep 12, 2025

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Classically activated macrophages undergo functionally significant nucleotide metabolism remodelling driven by nitric

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Summary

Macrophages reprogram nucleotide metabolism during immune responses, shifting from synthesis to salvage pathways. Nitric oxide regulates these changes, impacting immune cell function and parasite growth.

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Area of Science:

  • Immunology
  • Metabolic pathways
  • Cellular reprogramming

Background:

  • Macrophages are key immune cells that undergo metabolic reprogramming during activation.
  • Nucleotide metabolism is crucial for cellular functions, including proliferation and immune responses.

Purpose of the Study:

  • To investigate the reprogramming of nucleotide metabolism in classically activated macrophages.
  • To identify the regulatory mechanisms and functional consequences of these metabolic shifts.

Main Methods:

  • Analysis of nucleotide synthesis and degradation pathways in activated macrophages.
  • Investigation of the role of nitric oxide in regulating nucleotide metabolism.
  • Assessment of the functional impact of altered nucleotide metabolism on macrophage functions and parasite infection using genetic manipulation (Hgprt knockout).

Main Results:

  • Classical macrophage activation significantly reprograms nucleotide metabolism, including altered de novo synthesis and increased purine salvage.
  • Nitric oxide was identified as a key regulator, inhibiting enzymes like ATIC and XOR and downregulating Tyms.
  • Inhibition of purine salvage impaired macrophage functions (migration, phagocytosis) and enhanced intracellular parasite (Toxoplasma gondii) proliferation.

Conclusions:

  • Macrophage activation involves extensive nucleotide metabolism reprogramming, essential for immune functions.
  • Nitric oxide-mediated regulation of nucleotide metabolism plays a critical role in controlling macrophage effector functions.
  • Targeting nucleotide metabolism pathways could offer new strategies for modulating immune responses and infectious diseases.