Folic acid deficiency and neutrophil dysfunction

Area of Science:

• Immunology
• Nutritional Science

Background:

• Protein-calorie malnutrition (PCM) is a global health issue.
• PCM is associated with impaired immune responses.
• Polymorphonuclear leukocytes (PMNs) are critical immune cells.

Purpose of the Study:

• To investigate the impact of PCM on PMN function.
• To determine the role of folic acid in PMN activity.
• To assess the effect of folic acid supplementation on immune function in PCM patients.

Main Methods:

• Studied PMN functions in 92 PCM patients.
• Grouped patients based on serum folic acid levels (<3 ng/ml vs. >3 ng/ml).
• Assessed phagocytosis and bactericidal ability in vitro and in vivo.

Main Results:

• Lower folic acid levels correlated with significantly reduced phagocytosis and bactericidal ability.
• Folic acid supplementation in deficient patients restored phagocytic function.
• In vitro addition of folic acid to serum also improved phagocytosis.
• Bactericidal function recovery was not observed after folic acid correction.

Conclusions:

• Folic acid deficiency significantly impairs PMN phagocytosis in PCM.
• Folic acid supplementation can restore phagocytic function.
• The role of folic acid in PMN bactericidal function requires further investigation.