Protocols to
grow organoids as polarized monolayers of epithelial cells on membranes or filters are already in place for the intestine, gall bladder, liver and pancreatic ducts (21).
But Sawyers discovered that he could easily
grow organoids from normal prostate tissue — «it just works beautifully,» he says — and then use gene - editing techniques such as CRISPR to study any cancer mutation he wants.
Importantly, the technique will also make it possible for researchers to
grow organoids from diseased endometrium such as in endometrial atrophy or cancer.
The technique also enables the researchers to
grow organoids from endometrial cancer cells.
Prof. Orly Reiner of the Institute's Department of Molecular Genetics says that her lab, along with many others, embraced the idea of
growing organoids.
The scientific community was showing great interest in this new approach to
growing organoids even before the paper's publication.
Growing organoids from those samples would be relatively simple, argued Beekman, who has since spearheaded the project.
Finally, the gels can carry pathogens or immunogens, which means that they are not suitable for
growing organoids to be used in the clinic.
Lütolf's lab found that this attachment itself is immensely important for
growing organoids, as it triggers a whole host of signals to the stem cell that tell it to grow and build an intestine - like structure.
By
growing organoids from tumor samples, researchers can create minitumors and use them to study how cancer develops or to test drugs.
Other researchers
grew organoids from induced pluripotent stem cells, which resemble embryonic stem cells but are grown from adult cells.
Soon, the lab began culturing LGR5 - positive cells and
growing organoids from the stomach, liver, and other organs.
The researchers coaxed white blood cells from humans and other apes into forming stem cells, from which
they grew organoids.
For example, to understand why a fetal brain sometimes doesn't reach full size, a condition called microcephaly, the researchers
grew organoids using iPS cells derived from a person with the condition.
To grow larger brains, the stem cells would also have to differentiate into blood vessels to supply nutrients to
the growing organoid.
These epithelial organoid cultures are genetically and phenotypically extremely stable, allowing transplantation of the cultured offspring of a single stem cell, as well as disease modeling by
growing organoids directly from diseased patient tissues (45).
Not exact matches
Researchers hope the
organoids will be better than lab animals or cells
growing in culture at revealing how the human brain develops, both normally and when things go awry, and identify potential therapeutic or genome - editing targets.
Implanting human brain
organoids in a mouse brain gives them everything they need to
grow and develop.
The Salk team therefore took human brain
organoids that had been
growing in lab dishes for 31 to 50 days and implanted them into mouse brains (more than 200 so far) from which they had removed a tiny bit of tissue to make room.
Wrinkles began to form in the outer layers of the
organoids about six days after the mini brains started
growing.
Jason Mills, a gastrointestinal pathologist at Washington University School of Medicine in St. Louis, envisions
growing thousands of such
organoids, each from a different person's cells, and infecting them with a pathogen to study the role of individual genetics.
The apparatus allowed the cells access to nutrients and oxygen while giving the researchers a peek at how the
organoids grew.
The researchers say that they can
grow the stomach
organoids from both embryonic stem cells and skin cells induced to pluripotency.
Cells inside the brains contract, while cells on the outside
grow and push outward, researchers at the Weizmann Institute of Science in Rehovot, Israel, discovered from working with the lab -
grown brains, or
organoids.
Muotri's work is a nice demonstration of the power of mini-brains to help understand the early, cellular features of neurological disorders, says Madeline Lancaster at the MRC Laboratory of Molecular Biology in Cambridge, UK, who developed the
organoid -
growing method Muotri used.
Scientists we sent Anand's poster presentation to said that although the team has indeed
grown some kind of miniature collection of cells, or «
organoid», in a dish, the structure isn't much like a fetal brain.
The only way the team can be sure they have
grown the equivalent of a fetal brain would be to genetically test individual cells from different regions of the
organoid, and compare them to those of human fetus, says Christof Koch at the Allen Institute for Brain Science in Seattle.
The same observations were made in
organoids (artificially
grown masses of cells that resemble an organ) created from unique basal progenitor cells that were isolated from the gastroesophageal junction in mice and humans.
Blood flow would make arrays of brain
organoids more likely to survive,
grow, and develop.
That is necessary if the
organoids are to
grow bigger, probably the only way they can mimic fully
grown brains and show how disorders such as autism, epilepsy, and schizophrenia unfold.
«We can generate cerebral
organoids with integrated endothelial tissue, this tissue forms tubes, and we can induce these tubes to sprout» into the nutrient broth that the cerebral
organoids grow in, said John Aach, a geneticist in Church's lab.
These micro quasi-brains are revolutionizing research on human brain development and diseases from Alzheimer's to Zika, but the headlong rush to
grow the most realistic, most highly - developed brain
organoids has thrown researchers into uncharted ethical waters.
Otherwise «you can't
grow them very large and you will be hampered in trying to get the
organoid to develop more mature cell types and structures.»
Scientists can't yet
grow spare parts of the human brain to fix neurological injuries or defects, but they have recently used stem cells to create brain
organoids, formations of cells that mimic some of the brain's regions.
The
organoids with the mutated gene
grew to the same proportions as the first group, but they developed few folds and the ones they did develop were very different in shape from normal wrinkles.
So the group
grew new
organoids, this time bearing the same mutations carried by babies with smooth brain syndrome.
Or, in patients who've had part of the small intestine removed, tiny pieces of gut
organoid tissue could be implanted and, after
growing larger, connected to the intestine.
A few months before the 2013 Sasai team paper, Madeline Lancaster and Juergen Knoblich of the Institute of Molecular Biotechnology in Vienna and U.K. colleagues demonstrated their more freewheeling, landmark approach to
growing brain
organoids (SN: 9/21/13, p. 5).
Although the
organoids don't
grow enough to replicate entire human organs, these mini-versions can mimic the 3 - D cellular infrastructure of everything from our guts to our lungs.
According to his unpublished findings, when he puts glioblastoma cells from patients into lab dishes with brain
organoids, the cells attach to the surface of the
organoids, burrow into them, and within 24 to 48 hours
grow into a mass that eventually «looks exactly like what happened in the patient's own brain,» Fine said.
The cells were
grown into
organoids, essentially mini-brains in a dish.
Part of the trouble is the ingredients: Subtle variations in tissue - culture chemicals and Matrigel, or in different stem cell lines and how they are
grown first in 2 - D culture, can have a big impact on how the
organoids turn out, Novitch says.
In the years since the 2013 debut of human brain
organoids, research groups have worked to
grow bigger brain tissue clumps and more uniform structures.
Moving forward, he was able to place these taste stem cells in a culture dish and prompt them to
grow into the different mature taste cell types, thus creating a taste bud in a dish — scientifically known as taste
organoids.
For another, the tumors in the brain
organoids «mimic how far and how fast» the patient's own cancer
grew, «and how destructive it was,» Fine said.
Some scientists have distant dreams of using
organoid methods to
grow full - size livers or kidneys in the lab for transplantation.
To form an
organoid, the stem cells are
grown inside three - dimensional gels that contain a mix of biomolecules that promote stem cell renewal and differentiation.
But currently
organoids are very difficult to
grow in a standardized and controlled way, which is key to designing and using them.
They then
grew these into
organoids — 3D «mini-guts» — in the laboratory to amplify the single cells so they could be studied.
In this lung
organoid grown in Hans Clevers's lab, cells colored green are infected with respiratory syncytial virus.