Abstract
In this research, using a commercially available human specific caspase 3/7 chemiluminescent test kit (Caspase 3/7 Glo, Promega, Madison, WI), developed for cell based assays, we describe a microplate-based whole zebrafish assay format to identify potential small molecule caspase inhibitors and activators. Based on the high degree of evolutionary conservation among species, we show that human specific 3/7 substrate cross reacts with zebrafish. Using untreated zebrafish, optimum assay conditions (including substrate concentration, number of zebrafish per microwell, and incubation time to generate a linear reaction) are determined. Robustness and reproducibility of the assay are established using a characterized caspase 3/7 inhibitor (z-VAD-fmk) and an activator (staurosporine). Next, the whole zebrafish microplate assay format is validated using three additional characterized caspase 3/7 inhibitors, two additional caspase 3/7 activators, and one control compound that has no effect on zebrafish apoptosis. Compared to other whole animal assay formats, chemiluminescence provides high sensitivity and low background. Next, results are compared with published results in mammalian cell based assays and animal models and show that the overall predictive success rate is 100 %. Compound effects on apoptosis are further confirmed visually by whole mount staining with acridine orange (AO), a live dye. Results support the high degree of conservation of key pathways in zebrafish and humans. The microplate-based whole zebrafish caspase 3/7 assay format represents a rapid, reproducible, predictive animal model for identifying potential inhibitors and activators. Use of zebrafish as an alternative animal model to identify potential apoptosis modulators can accelerate the drug discovery process and reduce costs.
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Abbreviations
- ac-DEVD-cho:
-
Acetyl-aspartic acid-glutamic acid-valine-aspartic acid-aldehyde
- ac-DNLD-cho:
-
Acetyl-aspartic acid-aspartic acid-leucine-aspartic acid-aldehyde
- Ala (A):
-
Alanine
- AO:
-
Acridine orange
- Asp (D):
-
Aspartic acid
- Asp-Glu-Val-Asp:
-
Aspartic acid–glutamic acid–valine–aspartic acid
- AVMA:
-
American Veterinary Medical Association
- CV:
-
Coefficient of variation
- DMSO:
-
Dimethyl sulfoxide
- dpf:
-
Days post fertilization
- ECVAM:
-
European Centre for the Validation of Alternative Methods
- Glu (E):
-
Glutaric acid
- h:
-
hours
- hpf:
-
Hours post-fertilization
- HUVEC:
-
Human umbilical vein endothelial cells
- M:
-
Mean
- MESAB:
-
Ethyl 3-aminobenzoate methanesulfonate
- mg:
-
milligram
- min:
-
Minutes
- q-VD-oph:
-
Quinoline-valine-aspartic acid-oxo-pentanoic acid hydrate
- RLU:
-
Relative luminescence units
- ROI:
-
Region of Interest
- S:
-
Seconds
- SD:
-
Standard deviation
- S/N:
-
Signal/noise
- Val (V):
-
Valine
- μl:
-
Microliter
- μM:
-
Micromole
- z-VAD-fmk:
-
N-Benzyloxycarbonyl-valine-alanine-aspartic acid (O-Me)-fluoromethylketone
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Acknowledgement
The research was supported in part by National Institutes of Health grants: National Institute of Medical Sciences: 1R43GM087754.
Conflict of Interest
Both Patricia McGrath and Wen Lin Seng are employees and shareholders of Phylonix.
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Seng, W.L., Zhang, D., McGrath, P. (2016). Microplate-Based Whole Zebrafish Caspase 3/7 Assay for Screening Small Molecule Compounds. In: Muganda, P. (eds) Apoptosis Methods in Toxicology. Methods in Pharmacology and Toxicology. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-3588-8_11
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DOI: https://doi.org/10.1007/978-1-4939-3588-8_11
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