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Antioxidant status in children with homozygous thalassemia
Veena Dhawan1, Kh Ratan Kumar, R K Marwaha
1Department of Experimental Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh 160 012, India.
Insights
Transfusion-dependent beta-thalassemia patients show reduced levels of key antioxidants like vitamins A and E, and lower superoxide dismutase (SOD) activity, indicating increased oxidative stress. Nutritional support may help mitigate this damage.
Area of Science:
- Biochemistry
- Hematology
- Nutritional Science
Background:
- Beta-thalassemia is a severe inherited blood disorder requiring regular blood transfusions.
- Patients with beta-thalassemia often experience chronic oxidative stress.
- Antioxidants play a crucial role in combating oxidative damage in various conditions.
Purpose of the Study:
- To evaluate the status of enzymatic and non-enzymatic antioxidants in patients with transfusion-dependent beta-thalassemia.
- To compare antioxidant levels in thalassemic patients with healthy, age-matched controls.
- To investigate the association between beta-thalassemia and oxidative stress.
Main Methods:
- Assessed levels of vitamins A and E in plasma and red blood cells (RBCs) using High-Performance Liquid Chromatography (HPLC).
- Measured superoxide dismutase (SOD) enzyme activity in patients and controls.
- Included 41 transfusion-dependent beta-thalassemia patients and 20 age-matched controls with non-hemolytic anemia.
Main Results:
- Significantly lower plasma vitamin A levels were observed in thalassemic patients compared to controls (p<0.05).
- RBC vitamin E levels were markedly reduced in thalassemic patients, with 31.7% having unmeasurable levels.
- SOD enzyme activity was at least 1.5 times lower in thalassemic patients than in controls (p<0.05).
Conclusions:
- Transfusion-dependent beta-thalassemia is associated with significantly enhanced oxidative stress.
- Reduced levels of key antioxidants (vitamins A and E, SOD) highlight a pro-oxidant state in these patients.
- Targeted antioxidant therapy and dietary interventions may be beneficial in preventing oxidative damage in beta-thalassemia.
Abstract:
The status of enzymatic and non-enzymatic anti-oxidants was evaluated in 41 patients with transfusion dependent beta-thalassemia. An additional 20 age-matched children, with non-hemolytic anemia, served as controls. Fresh blood samples, obtained in the morning, were processed immediately. Plasma was stored at -80 degrees C. Levels of vitamins A and E were assayed simultaneously by HPLC. RBC vitamin A was not measurable in 29 (70.7%) thalassemics and in all the controls. Plasma vitamin A levels were lower in thalassemics than in controls (p<0.05). Vitamin E in RBCs was not measurable in 13 (31. 7%) cases. The mean level of RBC vitamin E was 3 times lower in thalassemics. Similarly, SOD enzyme activity in thalassemics, was at least 1.5 lower in comparison to the activity documented in controls (p<0. 05). The observations indicate that thalassemics have enhanced oxidative stress. Administration of selective antioxidants and a balanced diet may preclude oxidative damage.
