Vitamin a deficiency in patients with common variable immunodeficiency

Area of Science:

• Immunology
• Nutrition Science
• Biochemistry

Background:

• Vitamin A is an antioxidant micronutrient with immunomodulating effects.
• Vitamin A deficiency is linked to altered cytokine profiles, shifting towards type 1 cytokines.
• Immunodeficiency disorders like CVID involve dysregulated immune responses.

Purpose of the Study:

• To assess Vitamin A status in patients with Common Variable Immunodeficiency (CVID).
• To investigate the relationship between Vitamin A levels and cytokine production in CVID patients.
• To explore the in vitro effects of a Vitamin A derivative on cytokine production.

Main Methods:

• Serum levels of Vitamin A, neopterin, TNF-alpha, IL-2, IL-4, and IL-10 were measured in 19 CVID patients and 15 healthy children.
• Lymphocyte cultures from CVID patients and healthy controls were treated with 9-cis retinal, a Vitamin A derivative.
• Cytokine production (TNF-alpha, IL-2, IL-4, IL-10) was analyzed in vitro.

Main Results:

• CVID patients had significantly lower serum Vitamin A (21.1 μg/dL) compared to healthy children (35.7 μg/dL).
• Serum neopterin levels were significantly higher in CVID patients (9.8 nmol/L) than in controls (3.9 nmol/L).
• CVID patients showed significantly lower serum IL-4 levels, while TNF-alpha, IL-2, and IL-10 levels were similar between groups.

Conclusions:

• CVID patients present with suboptimal Vitamin A status and elevated neopterin levels.
• In vitro, a Vitamin A derivative (9-cis retinal) enhanced the production of TNF-alpha, IL-4, and IL-2 in mononuclear cells.
• Vitamin A supplementation could potentially modulate inflammatory responses in CVID patients.