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Mycophenolic Acid-Induced Developmental Defects in Zebrafish Embryos.

Ling-Ling Jiang1, Mei-Hui Liu2, Jian-Ying Li3

  • 1Institute of Translational Medicine, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, People's Republic of China.

International Journal of Toxicology
|October 4, 2016
PubMed
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This summary is machine-generated.

Mycophenolic acid (MPA) causes birth defects in zebrafish embryos by inhibiting purine synthesis. Adding guanosine partially reversed these toxic effects, suggesting a mechanism involving nucleotide depletion.

Area of Science:

  • Developmental toxicology
  • Pharmacology
  • Molecular biology

Background:

  • Mycophenolic acid (MPA) is increasingly used in organ transplantation.
  • Clinical studies suggest MPA is a human teratogen, but its mechanism is unclear.
  • MPA inhibits de novo purine synthesis via inosine monophosphate dehydrogenase (IMPDH).

Purpose of the Study:

  • To investigate the teratogenic effects of MPA on zebrafish embryos.
  • To elucidate the mechanism underlying MPA-induced teratogenicity.

Main Methods:

  • Zebrafish embryos were exposed to varying concentrations of MPA.
  • Morphological defects were assessed.
  • Quantitative polymerase chain reaction (qPCR) was used to analyze gene expression.
  • Reversal studies with guanosine were performed.
Keywords:
developmental toxicityinosine monophosphate dehydrogenasemycophenolic acidzebrafish embryos

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Main Results:

  • MPA caused dose-dependent morphological defects (tail curvature, pericardial edema) in zebrafish embryos.
  • MPA significantly reduced impdh1b and impdh2 expression at the LC25 level.
  • The teratogenic index was calculated as 16, confirming MPA's teratogenicity.
  • Co-administration of guanosine partially reversed MPA-induced toxicity.

Conclusions:

  • MPA is a teratogen in zebrafish embryos.
  • MPA impairs embryonic development by inhibiting IMPDH activity.
  • This inhibition leads to guanosine nucleotide depletion, causing developmental toxicity.