Animal Testing Alternatives
Animal Testing Alternatives - Related Videos
01:23
Toxicity Testing in Animals
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2026
Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
04:28
Utilizing an Orally Dissolving Strip for Pharmacological and Toxicological Studies: A Simple and Humane Alternative to Oral Gavage for Animals
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Cited by 4 •
2016
The following protocol describes a novel method for chronic oral drug administration using an orally dissolving strip (ODS) in lieu of the more commonly used oral gavage method. We demonstrate that preclinical, oral drug delivery using the ODS method represents a safe, convenient, and humane alternative to oral gavage.
02:18
Alternative RNA Splicing
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2020
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity. There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
01:36
Worms as an Alternative Model Organism
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2026
All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Introduction to C. elegans The nematode (roundworm) Caenorhabditis elegans, commonly known as C. elegans, is a widely used non-vertebrate animal model for studying fundamental biological processes. Because many cellular and...
06:58
Animal Behavior - Student Protocol
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2019
Making Choice Chambers ExpandBefore beginning the experiments, use one of the Sharpies from the lab table to trace a line around the circumference of the bottom of both bottles. One line should be 1 cm from the base of the bottle and the other should be 1.5 cm from the base of the bottle. Use a razor blade to make a small cut in each bottle at the mark. Then, insert the scissors and carefully cut along the line until the bottoms of the bottles are removed completely. Fit one bottle bottom into...
FAQs
The replace, reduce, and refine framework guides how researchers choose and improve experimental systems. Replacement seeks evidence without whole animals, reduction limits animal use when some use remains necessary, and refinement aims to lessen burdens while preserving scientific value. In bioengineering, this framework encourages development of increasingly human-relevant models rather than treating animal studies as the only benchmark.
Different engineered models capture different levels of biological organization. Cell cultures can reveal responses at the cellular level, while three-dimensional tissues and organoids represent more complex tissue features. Organ-on-chip systems add controlled interactions within engineered environments, and computational models provide another way to evaluate responses. Model selection therefore depends on the biological question and the response being measured.
Controlled conditions let investigators evaluate a defined response while limiting the variability associated with a whole organism. This can improve experimental control and make it easier to examine cellular toxicity, drug activity, disease processes, or tissue interactions separately. Such focused measurements help bioengineers identify how a system responds and compare evidence across designed experimental conditions.
A major scientific consideration is how well evidence translates to human health. Animal findings may not fully capture human biology, whereas human-oriented cultures, tissues, organoids, chips, and computational models are designed to recreate aspects of it. These alternatives therefore address both an ethical concern and the research problem of obtaining evidence more directly relevant to human responses.
A typical bioengineering workflow begins by defining the response of interest, such as toxicity, drug activity, disease behavior, or tissue interaction. Researchers then select a suitable engineered or computational model, apply the relevant test condition, and measure the resulting response. The final assessment considers whether the model produces scientifically useful, human-relevant evidence under controlled conditions.
Measurements can address several distinct outcomes rather than producing a single general result. Investigators may assess cellular toxicity, determine whether a drug shows activity, examine disease processes, or study interactions between tissues. Matching the measurement to the model’s biological level is important: cell cultures support cellular readouts, while tissue-oriented systems support questions about tissue behavior.
These approaches are especially relevant to therapeutic research because they can examine drug activity, toxicity, disease processes, and tissue interactions in engineered systems. Their use may accelerate research while improving experimental control and addressing ethical concerns. In bioengineering, this application connects cell cultures, tissues, organoids, chips, and computational models with the need for more human-relevant biomedical evidence.