Name: rapid evaluation of toxicity of chemical compounds using zebrafish embryos
Uploaded: 2019-08-25T14:00:00
Description: Watch this Scientific Journal Video about Rapid Evaluation of Toxicity of Chemical Compounds Using Zebrafish Embryos at JoVE.com

The work was supported by grants from Sigrid Juselius Foundation (SP, MP), Finnish Cultural Foundation (AA, MH), Academy of Finland (SP, MP), Orion Farmos Foundation (MH), Tampere Tuberculosis Foundation (SP, MH and MP) and Jane and Aatos Erkko Foundation (SP and MP). We thank our Italian and French collaborators, Prof. Supuran, and Prof. Winum, for providing carbonic anhydrase inhibitors for safety and toxicity evaluation for anti-TB and anti-cancer drug development purposes. We thank Aulikki Lehmus and Marianne Kuuslahti for the technical assistance. We also thank Leena M&#228;kinen and Hannaleena Piippo for their help with the zebrafish breeding and collection of embryos. We sincerely thank Harlan Barker for critical evaluation of the manuscript and insightful comments.

The zebrafish core facility at Tampere University has an establishment authorization granted by the National Animal Experiment Board (ESAVI/7975/04.10.05/2016). All the experiments using zebrafish embryos were performed according to the Provincial Government of Eastern Finland, Social and Health Department of Tampere Regional Service Unit protocol # LSLH-2007-7254/Ym-23.
1. Setting Up of Overnight Zebrafish Mating Tanks
<ol>
	<li>Place 2-5 adult male zebrafish and 3-5 adult female zebrafish ...

<ol>
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In vitro toxicity test using cultured cells can detect survival and morphological studies of the cells providing limited information about the toxicity induced by the test compound. The advantage of toxicity screening of chemical compounds using zebrafish embryos is rapid detection of chemically induced phenotypic changes in a whole animal during embryonic development in a relevant model organism. Approximately 70% of protein-coding human genes have orthologs counterparts in the zebrafish genome<sup class="xref"...

Drug development is an expensive process. Before a single chemical compound is approved by the Food and Drug Administration (FDA) and European Medicines Agency (EMA) several thousand compounds are screened at a cost of over one billion dollars1. During the preclinical development, the largest part of this cost is required for the animal testing2. To limit the costs, researchers in the field of drug development need alternative models for the safety screening of chemical compounds3. Therefore, in the early phase of the drug development, it would be very beneficial to use a method that can rapidly evaluate the safety and toxicity of the compounds in a suitable model. There are several protocols that have been used for the toxicity screening of chemical compounds involving animal and cell culture models but there is not a single protocol that is validated and is in common use4,5. Existing protocols using zebrafish vary in length and have been used by individual researchers who evaluated the toxicity as per their convenience requirement6,7,8,9,10,11,12.
In the recent past, the zebrafish has emerged as a convenient model for the evaluation of the toxicity of chemical compounds during embryonic development6,7. The zebrafish has many in-built advantages for the evaluation of chemical compounds13. Even large-scale experiments are amenable, as a zebrafish female can lay batches of 200-300 eggs, which develop rapidly ex&#160;vivo, do not need external feeding for up to a week and are transparent. The compounds can be added directly into the water, where they can (depending on the nature of the compound) diffuse through the chorion, and after hatching, through the skin, gills and mouth of larvae. The experiments do not require copious amounts of chemical compounds14 due to the small size of the embryo. Developing zebrafish embryos express most of the proteins required to achieve the normal developmental outcome. Therefore, a zebrafish embryo is a sensitive model to assess whether a potential drug can disturb the function of a protein or signaling molecule that is developmentally significant. The organs of the zebrafish become functional between 2-5 dpf15, and compounds that are toxic during this sensitive period of embryonic development induce phenotypic defects in zebrafish larvae. These phenotypic changes can be readily detected using a simple microscope without invasive techniques11. Zebrafish embryos are widely used in toxicological research due to their much greater biological complexity compared to in vitro drug screening using cell culture models16,17. &#160;As a vertebrate, the genetic and physiologic makeup of zebrafish is comparable to humans and hence toxicities of chemical compounds are similar between zebrafish and humans8,18,19,20,21,22. Zebrafish is, thus, a valuable tool in the early phase of drug discovery for the evaluation of toxicity and safety of the chemical compounds.
In the present article, we provide a detailed description of the method used for evaluating the safety and toxicity of carbonic anhydrase (CA) inhibitor compounds using 1-5-day post fertilization (dpf) zebrafish embryos by a single researcher. The protocol involves exposing zebrafish embryos to different concentrations of chemical inhibitor compounds and studying the mortality and phenotypic changes during the embryonic development. At the end of the exposure to the chemical compounds, the LC50 dose of the chemical is determined. The method allows an individual to carry out efficient screening of 1-5 test compounds and takes about 8-10 h depending on the experience of the person with the method (Figure 1). Each of the steps required to assess the toxicity of the compounds is outlined in Figure 2. The evaluation of toxicity of CA inhibitors requires 8 days, and includes setting up of mating pairs (day 1); collection of embryos from breeding tanks, cleaning and transferring them to 28.5 &#176;C incubator (day 2); distribution of the embryos into the wells of a 24-well plate and addition of diluted CA inhibitor compounds (day 3); phenotypic analysis and imaging of larvae (day 4-8), and determination of LC50 dose (day8). &#160;This method is rapid and efficient, requires a small amount of the chemical compound and only basic facilities of the laboratory.

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	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">24-well plates</td>
			<td style="width:185px;">Nunc</td>
			<td style="width:260px;">Thermo Scientific</td>
			<td style="width:185px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Balance (Weighing scale)</td>
			<td style="width:185px;">KERN</td>
			<td style="width:260px;">PLJ3000-2CM</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Balance (Weighing scale)</td>
			<td style="width:185px;">Mettler Toledo</td>
			<td style="width:260px;">AB104-S/PH</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">CaCl2</td>
			<td style="width:185px;">JT.Baker</td>
			<td style="width:260px;">RS421910024</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Disecting Probe</td>
			<td style="width:185px;">Thermo Scientific</td>
			<td>17-467-604&#160;</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">DMSO</td>
			<td style="width:185px;">Sigma Aldrich, Germany</td>
			<td style="width:260px;">D4540</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Falcon tubes 15 mL</td>
			<td style="width:185px;">Greiner bio-one</td>
			<td style="width:260px;">188271</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">High molecular weight methylcellulose</td>
			<td style="width:185px;">Sigma Aldrich, Germany</td>
			<td style="width:260px;">M0262&#160;</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Incubator for zebrafish larvae</td>
			<td style="width:185px;">Termaks</td>
			<td style="width:260px;">B8000</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">KCL</td>
			<td style="width:185px;">Merck</td>
			<td style="width:260px;">1.04936.0500</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Methyl Blue</td>
			<td style="width:185px;">Sigma Aldrich, Germany</td>
			<td style="width:260px;">28983-56-4</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">MgSO4</td>
			<td style="width:185px;">Sigma Aldrich, Germany</td>
			<td style="width:260px;">M7506</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Microcentrifuge tubes</td>
			<td style="width:185px;">Starlab</td>
			<td style="width:260px;">S1615-5500</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">NaCl</td>
			<td style="width:185px;">VWR Chemicals</td>
			<td style="width:260px;">27810.295</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Paraffin Histoplast IM</td>
			<td style="width:185px;">Thermo Scientific</td>
			<td style="width:260px;">8331</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Pasteur pipette&#160;</td>
			<td style="width:185px;">Sarstedt</td>
			<td style="width:260px;">86.1171</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Petri dish</td>
			<td style="width:185px;">Thermo Scientific</td>
			<td>101R20&#160;</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Petri plates</td>
			<td style="width:185px;">Sarstedt</td>
			<td style="width:260px;">82.1473</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Pipette (1 mL and 200 &#956;L)</td>
			<td style="width:185px;">Thermo Scientific</td>
			<td style="width:260px;">4641230N, 4641210N&#160;&#160;</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Plates 24-Well</td>
			<td style="width:185px;">Thermo Scientific</td>
			<td style="width:260px;">142485</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Steriomicroscope/Camera</td>
			<td style="width:185px;">Zeiss</td>
			<td style="width:260px;">Stemi 2000-C/Axiocam 105 color</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Vials (1.5 mL)</td>
			<td style="width:185px;">Fisherbrand</td>
			<td style="width:260px;">11569914</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:342px;">Zebrafish AB strains</td>
			<td style="width:185px;">ZIRC&#160;</td>
			<td style="width:260px;">&#160; ZL1&#160;</td>
			<td></td>
		</tr>
	</tbody>
</table>

rapid evaluation of toxicity of chemical compounds using zebrafish embryos

The zebrafish is a widely used vertebrate model organism for the disease and phenotype-based drug discovery. The zebrafish generates many offspring, has transparent embryos and rapid external development. Zebrafish embryos can, therefore, also be used for the rapid evaluation of toxicity of the drugs that are precious and available in small quantities. In the present article, a method for the efficient screening of the toxicity of chemical compounds using 1-5-day post fertilization embryos is described. The embryos are monitored by stereomicroscope to investigate the phenotypic defects caused by the exposure to different concentrations of compounds. Half-maximal lethal concentrations (LC50) of the compounds are also determined. The present study required 3-6 mg of an inhibitor compound, and the whole experiment takes about 8-10 h to be completed by an individual in a laboratory having basic facilities. The current protocol is suitable for testing any compound to identify intolerable toxic or off-target effects of the compound in the early phase of drug discovery and to detect subtle toxic effects that may be missed in the cell culture or other animal models. The method reduces procedural delays and costs of drug development.

The critical part of the evaluation of toxicity is testing different concentrations of one or multiple chemical compounds in a single experiment. In the beginning, select the compounds for evaluation of toxicity, the number of concentrations to test for each compound, and accordingly, make a chart (Figure 3). We used a unique color for each compound to organize the samples (Figure 3). The use of solvent resistant marker and label...

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Rapid Evaluation of Toxicity of Chemical Compounds Using Zebrafish Embryos

Zebrafish embryos are used for evaluating the toxicity of chemical compounds. They develop externally and are sensitive to chemicals, allowing detection of subtle phenotypic changes. The experiment only requires a small amount of compound, which is directly added to the plate containing embryos, making the testing system efficient and cost-effective.

The zebrafish is a widely used vertebrate model organism for the disease and phenotype-based drug discovery. The zebrafish generates many offspring, has ...

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