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ZIRC
ZFIN ID: ZDB-PUB-140513-121
Knocking down 10-formyltetrahydrofolate dehydrogenase increased oxidative stress and impeded zebrafish embryogenesis by obstructing morphogenetic movement
Chang, W.N., Lee, G.H., Kao, T.T., Lin, C.Y., Hsiao, T.H., Tsai, J.N., Chen, B.H., Chen, Y.H., Wu, H.R., Tsai, H.J., Fu, T.F.
Date: 2014
Source: Biochimica et biophysica acta. General subjects 1840(7): 2340-2350 (Journal)
Registered Authors: Chen, Yau-Hung
Keywords: Cell migration, FDH, Folate metabolism, ROS, Zebrafish
MeSH Terms:
  • Amino Acid Sequence
  • Animals
  • Embryonic Development/genetics*
  • Folic Acid/genetics
  • Folic Acid/metabolism*
  • Gene Expression Regulation, Developmental
  • Gene Knockdown Techniques
  • Humans
  • Morphogenesis/genetics*
  • Morpholinos
  • Oxidative Stress/genetics*
  • Oxidoreductases Acting on CH-NH Group Donors/genetics*
  • Zebrafish/genetics
  • Zebrafish/growth & development
PubMed: 24747731 Full text @ BBA General Subjects
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ABSTRACT
Folate is an essential nutrient for cell survival and embryogenesis. 10-Formyltetrahydrofolate dehydrogenase (FDH) is the most abundant folate enzyme in folate-mediated one-carbon metabolism. 10-Formyltetrahydrofolate dehydrogenase converts 10-formyltetrahydrofolate to tetrahydrofolate and CO2, the only pathway responsible for formate oxidation in methanol intoxication. 10-Formyltetrahydrofolate dehydrogenase has been considered a potential chemotherapeutic target because it was down-regulated in cancer cells. However, the normal physiological significance of 10-Formyltetrahydrofolate dehydrogenase is not completely understood, hampering the development of therapeutic drug/regimen targeting 10-Formyltetrahydrofolate dehydrogenase.
10-Formyltetrahydrofolate dehydrogenase expression in zebrafish embryos was knocked-down using morpholino oligonucleotides. The morphological and biochemical characteristics of fdh morphants were examined using specific dye staining and whole-mount in-situ hybridization. Embryonic folate contents were determined by HPLC.
The expression of 10-formyltetrahydrofolate dehydrogenase was consistent in whole embryos during early embryogenesis and became tissue-specific in later stages. Knocking-down fdh impeded morphogenetic movement and caused incorrect cardiac positioning, defective hematopoiesis, notochordmalformation and ultimate death of morphants. Obstructed F-actin polymerization and delayed epiboly were observed in fdh morphants. These abnormalities were reversed either by adding tetrahydrofolate or antioxidant or by co-injecting the mRNA encoding 10-formyltetrahydrofolate dehydrogenase N-terminal domain, supporting the anti-oxidative activity of 10-formyltetrahydrofolate dehydrogenase and the in vivo function of tetrahydrofolate conservation for 10-formyltetrahydrofolate dehydrogenase N-terminal domain.
10-Formyltetrahydrofolate dehydrogenase functioned in conserving the unstable tetrahydrofolate and contributing to the intracellular anti-oxidative capacity of embryos, which was crucial in promoting proper cell migration during embryogenesis.
These newly reported tetrahydrofolate conserving and anti-oxidative activities of 10-formyltetrahydrofolate dehydrogenase shall be important for unraveling 10-formyltetrahydrofolate dehydrogenase biological significance and the drug development targeting 10-formyltetrahydrofolate dehydrogenase.
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