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AlCl3 induced learning and memory deficit in zebrafish.

Karamjeet Kaur1, R K Narang2, Shamsher Singh3

  • 1Department of Pharmacology, ISF College of Pharmacy, Moga, Punjab 142001, India; Affiliated to IKG, Punjab Technical University, Jalandhar, Punjab 144603, India.

Neurotoxicology
|July 17, 2022
PubMed
Summary

Aluminium chloride (AlCl3) exposure in zebrafish induces neurotoxicity, causing significant behavioral changes, oxidative stress, and neurotransmitter imbalances. These effects suggest AlCl3 contributes to neurodegeneration and Alzheimer

Keywords:
AlCl(3)Alzheimer's diseaseNeurodegenerationNrf-2Zebrafish

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Area of Science:

  • Neuroscience
  • Toxicology
  • Biochemistry

Background:

  • Aluminium (Al) is a known neurotoxicant, implicated in neurodegenerative diseases.
  • Aluminium chloride (AlCl3) exposure can elevate reactive oxygen species (ROS) and inflammatory markers, leading to neuronal damage.
  • Zebrafish models are valuable for studying neurotoxicity due to their conserved brain structures and genetic similarities to mammals.

Purpose of the Study:

  • To investigate the neurotoxic effects of AlCl3 exposure on zebrafish behavior, brain biochemistry, neurotransmitter levels, and molecular pathways.
  • To assess the dose-dependent impact of AlCl3 on anxiety-like behavior, memory, oxidative stress, and neuronal integrity in zebrafish.
  • To explore the potential role of AlCl3 in inducing Alzheimer's disease-like pathology.

Main Methods:

  • Zebrafish were exposed to three different doses of AlCl3 (50, 100, 200 µg/L) for four days.
  • Behavioral tests included a novel diving test for anxiety and T-maze and novel object recognition tests for memory.
  • Biochemical analyses involved measuring glutathione (GSH), superoxide dismutase (SOD), malondialdehyde (MDA), neurotransmitters (GABA, dopamine, noradrenaline, serotonin, glutamate), and assessing neuronal morphology and Nrf2 expression via histopathology and immunohistochemistry.

Main Results:

  • AlCl3 exposure significantly altered zebrafish behavior, increasing anxiety-like symptoms and impairing memory.
  • Biochemical analysis revealed increased oxidative stress (elevated MDA, reduced GSH and SOD) and disrupted neurotransmitter levels (decreased GABA, dopamine, noradrenaline, serotonin; increased glutamate).
  • Histopathological examination showed increased pyknotic neurons, and immunohistochemistry indicated reduced Nrf2 expression, suggesting cellular damage and impaired neuroprotective mechanisms.

Conclusions:

  • AlCl3 exposure induces significant neurotoxic effects in zebrafish, manifesting as behavioral deficits, oxidative stress, neurotransmitter imbalances, and neuronal damage.
  • The observed changes in zebrafish mirror key pathological features associated with Alzheimer's disease.
  • These findings highlight the neurotoxic potential of AlCl3 and its relevance to neurodegenerative conditions.