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Related Experiment Video

Updated: Apr 26, 2026

Acute and Chronic Models of Hyperglycemia in Zebrafish: A Method to Assess the Impact of Hyperglycemia on Neurogenesis and the Biodistribution of Radiolabeled Molecules
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A zebrafish model of hyperammonemia.

B Feldman1, M Tuchman2, L Caldovic2

  • 1Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA.

Molecular Genetics and Metabolism
|July 30, 2014
PubMed
Summary

A new zebrafish model effectively screens for ammonia-neuroprotective agents. Treatments like methionine sulfoximine and NMDA receptor antagonists significantly prolonged survival in hyperammonemic fish, offering potential new therapies.

Keywords:
Drug screenHyperammonemiaNeurotoxicityUrea cycleZebrafish

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Area of Science:

  • Neuroscience
  • Toxicology
  • Genetics

Background:

  • Hyperammonemia, resulting from urea cycle defects or liver failure, causes severe neuro-cognitive deficits and death.
  • Current treatments for hyperammonemia include ammonia-lowering strategies and liver transplantation.
  • Ammonia toxicity in fish shares pathological similarities with mammals.

Purpose of the Study:

  • To develop a zebrafish model for studying hyperammonemia.
  • To evaluate the efficacy of potential neuroprotective agents against ammonia toxicity in zebrafish.
  • To explore novel therapeutic strategies for hyperammonemia.

Main Methods:

  • Induction of hyperammonemia in 4-day-old zebrafish (Danio rerio) using ammonium acetate.
  • Administration of methionine sulfoximine (MSO) and NMDA receptor antagonists (MK-801, memantine, ketamine) to hyperammonemic zebrafish.
  • Assessment of survival rates and neuroprotective effects of the tested agents.

Main Results:

  • Exposure to 4mM ammonium acetate resulted in 100% mortality in 4-day-old zebrafish within hours.
  • MSO, MK-801, memantine, and ketamine individually prolonged the survival of ammonia-treated fish.
  • Combination therapy with MSO and an NMDA receptor antagonist demonstrated enhanced neuroprotection compared to monotherapy.

Conclusions:

  • Zebrafish serve as a viable model for screening ammonia-neuroprotective agents.
  • Methionine sulfoximine and NMDA receptor antagonists show promise in mitigating ammonia's neurotoxic effects.
  • This zebrafish screening platform could accelerate the discovery of new treatments for human hyperammonemia.