T-lymphocyte subpopulation changes during hemolysis in glucose-6-phosphate dehydrogenase (G6PD)-deficient children

Area of Science:

• Immunology
• Hematology
• Pediatrics

Background:

• Glucose-6-phosphate dehydrogenase (G6PD) deficiency is a common genetic disorder.
• Hemolytic crisis in G6PD-deficient individuals can be triggered by certain foods, like fava beans.
• The impact of acute hemolytic crisis on lymphocyte subpopulations in G6PD deficiency is not fully understood.

Purpose of the Study:

• To investigate alterations in lymphocyte subpopulations during acute hemolytic crisis in Sicilian children with G6PD deficiency.
• To assess the effect of fava bean ingestion-induced hemolysis on specific T-cell subsets (OKT4 and OKT8).

Main Methods:

• Sheep red blood cell (SRC)-rosetting technique was employed to study lymphocyte subpopulations.
• Monoclonal antibodies (OKT11, OKT3, OKT4, OKT8) were used for cell surface marker analysis.
• Analysis was performed on ten G6PD-deficient children during hemolytic crisis and on four children post-recovery.

Main Results:

• A significant reduction in SRC-rosetting lymphocytes was observed during the hemolytic crisis.
• The number of OKT3-positive cells remained normal.
• An inversion of the OKT4/OKT8 ratio occurred, characterized by decreased OKT4-positive cells and increased OKT8-positive cells. These changes normalized upon recovery.

Conclusions:

• Acute hemolytic crisis in G6PD-deficient children is associated with significant, reversible changes in lymphocyte subpopulations.
• The observed inversion of the OKT4/OKT8 ratio suggests a transient modulation of T-helper and cytotoxic T-cell populations during hemolysis.
• These findings highlight the complex interplay between genetic predisposition, environmental triggers, and immune system response in G6PD deficiency.