Dietary alterations modulate susceptibility to Plasmodium infection

Area of Science:

• Malariology
• Nutritional Immunology
• Metabolic Disease

Background:

• Genetic factors like sickle cell trait and G6PD deficiency are known to protect against severe malaria.
• The role of environmental factors, including diet and metabolism, in malaria infection outcomes remains largely unexplored.

Purpose of the Study:

• To investigate the impact of dietary variations, specifically a high-fat diet, on Plasmodium infection establishment and severity.
• To elucidate the underlying mechanisms by which diet influences parasite survival in the host.

Main Methods:

• Administration of a high-fat diet to mice for a short duration (4 days).
• Infection of mice with Plasmodium sporozoites and assessment of liver infection levels.
• Transcriptional analysis, genetic, and chemical approaches to identify molecular mediators.
• Evaluation of parasite survival and rescue by antioxidants or metabolic inhibitors.

Main Results:

• A 4-day high-fat diet reduced Plasmodium liver infection by over 90% in mice.
• Plasmodium parasites invaded hepatocytes but failed to establish infection due to death within cells.
• Oxidative stress, linked to fatty acid beta-oxidation, was identified as the mechanism impairing parasite survival.
• Administration of N-acetylcysteine or etomoxir rescued parasite load, confirming the role of oxidative stress and beta-oxidation.

Conclusions:

• Acute, transient dietary changes, such as a high-fat diet, can significantly impact Plasmodium infection establishment.
• Diet-induced oxidative stress within hepatocytes is a critical factor in controlling early-stage malaria infection.
• Metabolic interventions targeting fatty acid oxidation present a novel strategy for malaria prevention or treatment.