Respiratory depression and analgesia by opioid drugs in freely behaving larval zebrafish

Author:

Zaig Shenhab1,da Silveira Scarpellini Carolina2ORCID,Montandon Gaspard1ORCID

Affiliation:

1. Keenan Research Centre for Biomedical Sciences. St. Michael’s Hospital Unity Health Toronto, Toronto, Canada

2. Department of Medicine, Faculty of Medicine, University of Toronto, Toronto, Canada

Abstract

An opioid epidemic is spreading in North America with millions of opioid overdoses annually. Opioid drugs, like fentanyl, target the mu opioid receptor system and induce potentially lethal respiratory depression. The challenge in opioid research is to find a safe pain therapy with analgesic properties but no respiratory depression. Current discoveries are limited by lack of amenable animal models to screen candidate drugs. Zebrafish (Danio rerio) is an emerging animal model with high reproduction and fast development, which shares remarkable similarity in their physiology and genome to mammals. However, it is unknown whether zebrafish possesses similar opioid system, respiratory and analgesic responses to opioids than mammals. In freely-behaving larval zebrafish, fentanyl depresses the rate of respiratory mandible movements and induces analgesia, effects reversed by μ-opioid receptor antagonists. Zebrafish presents evolutionary conserved mechanisms of action of opioid drugs, also found in mammals, and constitute amenable models for phenotype-based drug discovery.

Funder

St. Michael's Hospital Foundation

J. P. Bickel Foundation

Publisher

eLife Sciences Publications, Ltd

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

Reference59 articles.

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