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Effect of blood transfusion on the immune response of children with thalassaemia
Insights
Blood transfusions in children with thalassemia did not impair cell-mediated immunity. However, transfused antibodies may affect the primary immune response to antigens, but not the secondary response.
Area of Science:
- Immunology
- Pediatrics
- Hematology
Background:
- Thalassemia is a genetic blood disorder requiring frequent blood transfusions.
- The impact of blood transfusions on the immune system in thalassemic patients is not fully understood.
- Assessing immune function is crucial for managing patients with chronic conditions like thalassemia.
Purpose of the Study:
- To investigate the effect of blood transfusions on cell-mediated and antibody-mediated immune responses in children with thalassemia.
- To differentiate between impaired immune function and other factors affecting immune tests in thalassemic patients.
Main Methods:
- Evaluated cell-mediated immunity using skin tests with specific (streptokinase-streptodornase, candidin) and nonspecific (dinitrochlorobenzene, phytohaemagglutinin) antigens.
- Assessed antibody response by measuring tetanus antitoxin titres before and after vaccination.
- Studied 46 children with thalassemia who received blood transfusions.
Main Results:
- No significant impairment of cell-mediated immunity was observed in the thalassemic children.
- A higher rate of negative phytohaemagglutinin skin tests was noted, but attributed to factors beyond immune deficiency.
- Transfused antibodies potentially inhibited primary immune responses to homologous antigens, especially with high antibody levels.
Conclusions:
- Blood transfusions in children with thalassemia do not appear to cause gross impairment of cell-mediated immunity.
- Phytohaemagglutinin test results should be interpreted cautiously in thalassemic patients due to confounding factors.
- Transfused antibodies may modulate the recipient's primary immune response, but secondary responses remain unaffected.
Abstract:
The effect of blood transfusions on the immune response of 46 thalassaemic children was studied. Cell-mediated immune response was evaluated by performing skin tests to specific (streptokinase-streptodornase and candidin) and nonspecific (dinitrochlorobenzene and phytohaemagglutinin) antigens. Antibody response to specific antigen (tetanus toxoid) was estimated by measuring the tetanus antitoxin titre before and after vaccination. No gross impairment of cell-mediated immunity was elicited. The larger proportion of negative phytohaemagglutinin skin tests found in thalassaemic patients does not necessarily suggest a cell-mediated immunity impairment, since this skin reaction is also affected by other factors, especially the inflammatory skin response. The transfused antibodies may inhibit the recipient's sensitization and primary immune response to the homologous antigen, especially when the antibody level in the transfused blood is high whereas the secondary immune response is not affected.