This blog is written by guest author, Maggie Bach, Sr. Product Manager, Promega Corporation.
Researchers are increasingly relying on cells grown in three-dimensional (3D) structures to help answer their research questions. Monolayer, or 2D cell culture, was the go-to cell culture method for the past century. Now, the need to better represent in vivo conditions is driving the adoption of 3D cell culture models. Cells grown in 3D structures better mimic tissue-like structures, better exhibit differentiated cellular functions, and better predict in vivo responses to drug treatment.
Switching to 3D cell culture models comes with challenges. Methods to interrogate these models need to be adaptable and reliable for the many types of 3D models. Some of the most popular 3D models include spheroids grown in ultra-low attachment plates, and cells grown in an extracellular matrix, such as Matrigel® from Corning. Even more complex models include medium flow over the cells in microfluidic or organ-on-a-chip devices. Will an assay originally developed for cells grown in monolayer perform consistently with various 3D models? How is measuring a cellular marker different when cells are grown in 3D models compared to monolayer growth?
Alternatives to animal testing have long been explored when it comes to studying the safety of various chemical compounds for use in food, medicine and cosmetics. With the advent of three-dimensional (3D) cell culture to create organoids, more relevant human organoid models are being explored as one way to provide safe and effective compound testing while minimizing the need for testing in animals. The international project Physiologically Anchored Tools for Realistic nanOmateriaL hazard aSsessment (PATROLS) led by the Swansea University Medical School aims to establish a battery of innovative, next-generation safety testing tools that can more accurately predict the effects of engineered nanomaterial (ENM) exposure in humans and the environment.
One project being researched by Samantha Llewellyn, a research assistant at Swansea University, is developing predictive physiologically relevant 3D liver models for ENM safety assessment. By having a model to evaluate realistic ENM exposures, a researcher can study liver function, hepatic metabolism and microtissue cell viability after acute (24 hours) or prolonged (several days) exposure. A microtissue model for assessing ENM hepatotoxicity needs to mimic primary hepatocytes and be amenable to assays used to test cell viability and metabolism.
The right tools for testing this 3D liver model include the bioluminescent-based CellTiter-Glo® 3D Viability and P450-Glo® Assays. When creating organoids, having reagents that can penetrate to the center of the dense and complex 3D liver spheroids is important so that the cell viability readout encompasses the entire microtissue. The CellTiter-Glo® 3D Viability Assay accomplishes this task, providing accurate assessment of 3D tissue cell health. Measuring cytochrome P450 (CYP450) activity is necessary for studying liver function. The P450-Glo® Assays have the flexibility to assess CYP450 activity while preserving the liver spheroids; thus, researchers can gather more data from a single experiment.
The importance of Samantha Llewellyn’s research as part of PATROLs is establishing a 3D liver model that could evaluate realistic ENM exposures and reduce the need for animal testing. Bioluminescent assays for assessing cell health and liver enzyme function are necessary to reach this goal.
Snakebite is a serious public health issue in many tropical countries. Every year, roughly 2 million cases of poisoning from snakebites occur, and more than 100,000 people die. Snake venom is extremely complex, containing a cocktail of chemicals, many of which are undefined. This complicates the development of new therapeutics for treating snakebite.
Antivenom is the most effective treatment for snakebites,
but its production is complex and dangerous. It involves manually milking the
venom from different species of live snakes, then injecting small doses of the
venom into animals (mostly horses) to stimulate an immune response. After a
period of time, antibodies form in the animal’s blood, which is purified for
use as antivenom.
But what if we could produce snake venom in the lab, instead
of using live snakes? Recently, a group from the Netherlands did just that by
growing organoids derived from snake venom glands.
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