Folate and folate-dependent enzymes associated with rat CNS development
M K Martinasevic1, G R Rios, M W Miller
1Department of Pharmacology, University of Iowa College of Medicine, Iowa City 52242, USA.
Developmental Neuroscience
|March 17, 1999
Summary
Folate levels in developing rat brains fluctuate, with specific enzymes like 10-formyltetrahydrofolate dehydrogenase (10-FTHFDH) showing dynamic changes. These shifts suggest 10-FTHFDH plays a key role in folate uptake and storage in glial cells.
Area of Science:
- Neuroscience
- Biochemistry
- Developmental Biology
Background:
- Folic acid and its derivatives are crucial for cellular growth processes.
- Understanding folate metabolism in the developing brain is essential for neurological development.
Purpose of the Study:
- To investigate the concentrations of folate and key folate-dependent enzymes in rat brain regions during early development.
- To elucidate the roles of 10-formyltetrahydrofolate synthetase (10-FTHFS) and 10-formyltetrahydrofolate dehydrogenase (10-FTHFDH) in brain folate metabolism.
Main Methods:
- Quantification of folate concentrations in various rat brain regions.
- Assay of 10-FTHFS and 10-FTHFDH enzyme activities.
- Immunohistochemical analysis to determine the cellular localization of 10-FTHFDH.
Main Results:
- Folate concentrations were high at birth, declined in the first two weeks, then increased significantly.
- 10-FTHFS activity remained consistently high throughout the study period.
- 10-FTHFDH levels were low initially, increasing significantly between postnatal days 14-28, correlating with folate concentration changes.
- Immunohistochemistry identified glial cells as the primary location for 10-FTHFDH in rat brain regions.
Conclusions:
- The dynamic changes in folate and 10-FTHFDH suggest its involvement in folate uptake and/or storage in the developing brain.
- Glial cells are a significant site for folate binding and metabolism, particularly mediated by 10-FTHFDH.
- These findings provide insights into the developmental regulation of folate metabolism in the central nervous system.
