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Megaloblastic erythropoiesis and macrocytosis in patients on anticonvulsants
Abstract:
The results of deoxyuridine suppression tests on the bone marrow cells of 14 patients on anticonvulsant drugs, 11 of whom had evidence of megaloblastic erythropoiesis, indicated that the megaloblastic changes and macrocytosis encountered in treated epileptics are often not caused either by folate deficiency or by drug-induced impairment of the 5, 10-methylenetetrahydrofolate-dependent methylation of deoxyuridylate to thymidylate. A folate-related abnormality in the methylation of deoxyuridylate was found in only two of the 11 patients with megaloblastic erythropoiesis.
Insights
Anticonvulsant drugs can cause megaloblastic changes in epilepsy patients. However, these changes are typically not due to folate deficiency or impaired DNA synthesis pathways.
Area of Science:
- Biochemistry
- Hematology
- Pharmacology
Background:
- Anticonvulsant drugs are frequently used in epilepsy management.
- Megaloblastic erythropoiesis and macrocytosis are potential side effects observed in patients on these medications.
- The underlying mechanisms for these hematological changes are not fully understood.
Purpose of the Study:
- To investigate the cause of megaloblastic changes and macrocytosis in patients treated with anticonvulsant drugs.
- To determine if folate deficiency or impaired thymidylate synthesis is responsible for these effects.
Main Methods:
- Deoxyuridine suppression tests were performed on bone marrow cells.
- 14 patients on anticonvulsant drugs were analyzed, 11 with megaloblastic erythropoiesis.
- Assessed folate levels and the 5,10-methylenetetrahydrofolate-dependent methylation pathway.
Main Results:
- Megaloblastic changes and macrocytosis were observed in 11 out of 14 patients.
- Folate deficiency was not identified as the primary cause in most cases.
- Impaired methylation of deoxyuridylate to thymidylate was found in only two patients.
Conclusions:
- The megaloblastic changes and macrocytosis in anticonvulsant-treated epileptic patients are often not caused by folate deficiency.
- Drug-induced impairment of the 5,10-methylenetetrahydrofolate-dependent methylation pathway is also an infrequent cause.
- Alternative mechanisms should be explored to explain these hematological abnormalities.