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Saturday, November 26, 2022

Why are scientists growing human brain cells in the lab?

Hannah Flynn
Medical News Today
Originally posted 24 OCT 22

Here is an excerpt:

Ethical boundaries

One of the limitations of using organoids for research is that it is observed in vitro. The way an organ might act in a system, in connection with different organs, or when exposed to metabolites in the blood, for example, could be different from how it behaves when cells are isolated in a single tissue.

More recently, researchers placed an organoid derived from human cells inside the brain of a rat, in a study outlined in Nature.

Using neural organoids that had been allowed to self-organize, these were implanted into the somatosensory cortex — which is in the middle of the brain — of newborn rats. The scientists then found that these cortical organoids had grown axons throughout the rat brain, and were able to contribute to reward-seeking behavior in the rat.

This breakthrough suggested that the lab-created cells are recognizable to other tissues in the body and can influence systems.

Combining the cells of animals and humans is not without some ethical considerations. In fact, this has been the focus of a recent project.

The Brainstorm Organoid Project published its first paper in the form of a comment piece outlining the benefits of the project in Nature Neuroscience on October 18, 2022, the week after the aforementioned study was published.

The Project brought together prominent bioethicists as part of the Brain Research through Advancing Innovative Neurotechnologies (BRAIN) Initiative of the US National Institutes of Health, which funded the project.

Co-author of the comment piece Dr. Jeantine E Lunshof, head of collaborative ethics at the Wyss Institute for Biologically Inspired Engineering at Harvard University, MA, told Medical News Today in an interview that existing biomedical research and animal welfare guidelines already provide a framework for this type of work to be done ethically.

Pointing to the International Society for Stem Cell Research guidelines published last year, she stated that those do cover the creation of chimeras, where cells of two species are combined.

These hybrids with non-primates are permitted, she explained: “This is very, very strong emphasis on animal welfare in this ISSCR guideline document that also aligns with existing animal welfare and animal research protocols.”

The potential benefits of this research needed to be considered, “though at this moment, we are still at the stage that a lot of fundamental research is necessary. And I think that that really must be emphasized,” she said.