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Abnormalities of serum transcobalamins in sickle cell disease (HbSS) in Black Africa
Insights
Sickle cell disease (SCD) patients show higher vitamin B12 binding proteins and white blood cell counts, but lower vitamin B12 levels. These changes suggest increased vitamin B12 demand and a role for transcobalamins in SCD
Area of Science:
- Hematology
- Nutritional Biochemistry
- Pediatric Medicine
Background:
- Sickle cell disease (SCD) is a genetic blood disorder with complex pathophysiology.
- Vitamin B12 and its binding proteins, transcobalamins, play crucial roles in cellular metabolism and immune function.
- Altered immune function and metabolic demands are characteristic of SCD.
Purpose of the Study:
- To investigate the relationship between vitamin B12 binding capacity, transcobalamins, and hematological parameters in pediatric SCD patients.
- To explore the potential role of vitamin B12 metabolism in the pathophysiology of SCD.
Main Methods:
- Measurement of unsaturated vitamin B12 binding capacity (UBBC) in serum.
- Quantification of transcobalamins (TC I, TC II, TC III).
- Determination of total leucocyte and neutrophil counts.
- Assay of endogenous vitamin B12 levels.
Main Results:
- Pediatric SCD patients exhibited increased levels of TC I and TC II binding capacities, correlating with elevated UBBC.
- Total white blood cell and neutrophil counts were significantly increased in the studied children.
- A notable reduction in endogenous vitamin B12 levels was observed in SCD patients.
Conclusions:
- The observed abnormalities in vitamin B12 binding and hematological parameters in SCD may be linked to splenic dysfunction, immune defects, and hepatic changes.
- Transcobalamins appear to be involved in the body's defense mechanisms, particularly in the context of SCD.
- Reduced serum cobalamin in SCD suggests a heightened requirement for vitamin B12 in metabolic processes, potentially for folate sparing.
Abstract:
The unsaturated vitamin B12 binding capacity (UBBC) of serum, the three transcobalamins (TC I, TC II, TC III), and the total leucocyte and neutrophil counts have been studied in paediatric patients with sickle cell disease (SCD). Increase in the level of the binding capacities of TC I and TC II with concomitant increase of UBBC was observed in these children who also had increased total white blood and neutrophil counts. There was a significant reduction in the level of endogenous B12. These abnormalities are discussed in relation to the deficiency of the splenic reticuloendothelial function, immunologic defect, hepatic degenerative changes and aplastic crisis observed in SCD. These results lend support to the view that transcobalamins are involved in the defence mechanism of the body. The significant reduction in serum cobalamin in SCD suggests a higher demand on this vitamin for metabolic functions, especially for the sparing of folate.