Comprehensive analysis of neurotoxin-induced ablation of dopaminergic neurons in Zebrafish larvae

Kalyn, Michael and Hua, Khang and Mohd Noor, Suzita and Wong, Chee Ern David and Ekker, Marc (2020) Comprehensive analysis of neurotoxin-induced ablation of dopaminergic neurons in Zebrafish larvae. Biomedicines, 8 (1). ISSN 2227-9059, DOI

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Neurotoxin exposure of zebrafish larvae has been used to mimic a Parkinson's disease (PD) phenotype and to facilitate high-throughput drug screening. However, the vulnerability of zebrafish to various neurotoxins was shown to be variable. Here, we provide a direct comparison of ablative effectiveness in order to identify the optimal neurotoxin-mediated dopaminergic (DAnergic) neuronal death in larval zebrafish. Transgenic zebrafish, Tg(dat:eGFP), were exposed to different concentrations of the neurotoxins MPTP, MPP+, paraquat, 6-OHDA, and rotenone for four days, starting at three days post-fertilization. The LC50 of each respective neurotoxin concentration was determined. Confocal live imaging on Tg(dat:eGFP) showed that MPTP, MPP+, and rotenone caused comparable DAnergic cell loss in the ventral diencephalon (vDC) region while, paraquat and 6-OHDA caused fewer losses of DAnergic cells. These results were further supported by respective gene expression analyses of dat, th, and p53. Importantly, the loss of DAnergic cells from exposure to MPTP, MPP+, and rotenone impacted larval locomotor function. MPTP induced the largest motor deficit, but this was accompanied by the most severe morphological impairment. We conclude that, of the tested neurotoxins, MPP+ recapitulates a substantial degree of DAnergic ablation and slight locomotor perturbations without systemic defects indicative of a Parkinsonian phenotype.

Item Type: Article
Funders: Natural Sciences and Engineering Research Council of Canada (NSERC) CGIAR (121795)
Uncontrolled Keywords: Parkinson's disease; Neurotoxins; Dopaminergic neurons; Ventral diencephalon; Locomotor; Zebrafish
Subjects: Q Science > QD Chemistry
Q Science > QH Natural history > QH301 Biology
R Medicine
Divisions: Faculty of Medicine > Biomedical Science Department
Depositing User: Ms Zaharah Ramly
Date Deposited: 02 Jun 2023 01:57
Last Modified: 02 Jun 2023 01:57

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