The following article originally appeared on November 11, 2019 in The Cell Culture Dish here.
The culture of organoids has permitted researchers access to a highly physiologically relevant system for studying human disease. Human organoids reflect key structural and functional properties of organs such as kidney, lung, gut, brain and retina making them incredibly valuable, particularly in situations where there is an unmet need for an in vitro human model.
While their value is undeniable, culturing organoids can be quite challenging. Many tools and techniques have been developed for organoid culture, however depending on the cell type, research area and experimental goals, it can be difficult to identify the right method.
For this Ask the Expert Session, we have assembled a team of experts to answer your questions on disease modeling using organoids. Please see our experts’ bios below.
Jie Wang, Ph.D.
Development Associate, Corning Life Sciences
Jie Wang is a Development Associate in Corning Life Sciences. During her 10 years with Corning Discovery Labware at Bedford MA, she has led the development of multiple recombinant protein based, and cell-based products. Jie received her Ph.D. degree from Boston College and her postdoc training from Harvard Medical School.
Elizabeth Abraham, Ph.D.
Senior Product Manager, Corning Life Sciences
Elizabeth has been employed at Corning Life Sciences (CLS) since 2008 and has held multiple senior roles in various functions including R&D, Project Management and Business Operations. At CLS, she led the development of various new products including advanced extracellular matrices/surface coatings and laboratory devices for culture of mammalian primary and stem cells. She has authored 23 journal articles, technical notes and is an inventor on 11 patents. In her earlier career, she worked in Cell Therapy evaluating potential stem cell treatments for Diabetes. Currently, she is the business lead on products for organoid and 3D cell culture; translating voice of customer into new concepts and commercializing them globally.
Franziska Wienholz, PhD
Scientific Support Specialist EMEA
Franziska Wienholz has conducted her PhD research on DNA damage repair and she was able to gain insights into its molecular regulation, contributing to understand how cells deal with DNA damage to prevent premature ageing and cancer. Since 2017 she is working as Scientific Support Specialist at Corning, where she is involved in advising internal and external customers with product support, in the design and set up of experiments, and in providing scientific data by presenting at customer facing events such as seminars and webinars.
Sylvia F Boj, Ph.D.
Scientific Director, Hubrecht Organoid Technology
Sylvia F Boj received her PhD in 2006 at the University of Barcelona, Spain for her work at IDIBAPS on functional genetic analysis for deciphering the transcriptional role of MODY genes in pancreatic beta cells.
With a long term EMBO fellowship, she subsequently joined the Hubrecht Institute (Utrecht, the Netherlands) as a postdoctoral fellow. In the laboratory of Prof. Hans Clevers she first studied the role of TCF7L2 regulating metabolism. Then, she established an in vitro organoid model for human pancreatic cancers. In 2014, she moved to Hubrecht Organoid Technology (Utrecht, the Netherlands) as a group leader for Cystic Fibrosis and Cancer programs. In 2016, she was appointed as Scientific Director of the HUB, with the ultimate goal of transferring scientific advances of the Organoid Technology to the development of new drugs, by interacting with pharmaceutical companies, and developing clinical trials to validate the predictive value of the Organoids for the response of patients.
We want to conduct long-term testing on our organoids, but we have trouble keeping them much past 24 hours. Do you have any advice on extending our culture?
Generating organoids is a delicate procedure and requires adjustments and testing for the specific cells and applications used. Culturing organoids is a likewise sensitive process and the specific requirements of the cells and the organoids needs to be evaluated.
The successful generation and long-term culture of organoids depends on many factors, including:
- Cell type (stem cells? From which organ?)
- Culture conditions (culture conditions, medium, ECMs used ?)
- Cell challenges (Low viability, organoids that disassemble, etc.)
- What assay is planned after the generation of the organoids?
Since this information is not outlined in this question, we wanted to share some helpful technical documents on the generation and culture of organoids for a period longer than 24 hours:
- A Novel Method for Generating Single, Intestinal Organoids for High Throughput Screening
- Culture of Mouse Intestinal Organoids in Corning® Matrigel® Matrix for Organoid Culture
- High Throughput Gene Expression Analysis of 3D Airway Organoids
Do you know of any place where there are protocols for creating different types of organoids based on cell types?
In recent years, Corning® Matrigel® matrix has developed into a powerful new tool for organoid cultures in areas like basic research and drug discovery, with several protocols available to support this work. Please find below some technical document suggestions that support the creation of different types of organoids.
Citations on Corning Matrigel Matrix and Organoid Culture
A compilation of research article citations, where several organoid types are referenced.
Modeling Development and Disease with Organoids
In this review article, Hans Clevers gives an overview on several organoid types and how they are generated. Using this foundational information as a starting point, we would recommend conducting a specific literature search on specific organoid types to find the most appropriate protocol for the desired application.
Organoid Models and Applications
Visit the Corning Life Sciences organoid models and application web page to learn more about a variety of organoid types and to access relevant published landmark papers that discuss methodologies to generate organoids.
For more specific organoid resources:
Single Lgr5 Stem Cells Build Crypt–villus Structures in vitro Without a Mesenchymal Niche
Cerebral Organoids Model Human Brain Development and Microcephaly
Identification of multipotent luminal progenitor cells in human prostate organoid culturesKIDNEY ORGANOIDS
Directing Human Embryonic Stem Cell Differentiation Towards a Renal Lineage Generates a Self-Organizing Kidney
We are looking for a synthetic alternative to Corning Matrigel matrix to culture our intestinal cell organoids. Can you recommend one?
There has been a growing interest to evaluate synthetic alternatives for Matrigel matrix to culture organoids. Researchers have shown that alginates and functionalized polyethylene glycol (PEG) formulations can support human pluripotent stem cell-derived intestinal organoids as well as organ progenitors from healthy mouse intestinal tissue. However, the researcher will need to tune the stiffness and functionalize the synthetic hydrogels appropriately. It is important to control both the biochemical cues as well as the structural support to get successful organoid growth. Here are a few links that address these methodologies.
In this context, it is also important to note that many of these synthetic options may not be as robust as Matrigel matrix in its ability to support organoid culture. For e.g. synthetic formulations may support organoid growth from healthy intestinal tissue but not patient-derived organoids; they may not support the various morphologies associated with organoid growth (budded vs. cystic forms). In those instances of pluripotent stem cell (PSC)-derived organoids, one still expands PSCs in Matrigel matrix prior to moving to a synthetic environment; therefore a total synthetic replacement for Matrigel matrix is yet to be identified.
Corning recently launched new Matrigel matrix for organoid culture, an optimized ECM that provides the biochemical cues, porosity and stiffness to culture intestinal organoids.
I am curious about scalability. For this to work for drug discovery, throughput must be fairly high. I would love to hear your thoughts about how to increase throughput.
The nature of organoids provides an excellent basis for drug discovery. As referenced in the question, a large volume of organoids would be required to move organoids into a high throughput screening environment. Although there are still currently challenges in this area, including labor-intensive work and time, there are protocols that briefly introduce how organoids can be expanded.
Application Notes and Review Articles:
- A Novel Method for Generating Single, Intestinal Organoids for High Throughput Screening
- Generation of Cerebral Organoids from Human Pluripotent Stem Cells
- A Simple Bioreactor-Based Method to Generate Kidney Organoids from Pluripotent Stem Cells
For scalability, organoids can be plated in single well plates. When preparing organoids for a drug screen, an extra split in which organoids are processed 1:1 and plated again for 1-2 days canincrease the number of organoids significantly. This gives the organoids time to recover from the stress of disruptions, and let them reach the appropriated size for screening activities (20-70 µm). We have not had good experience plating organoids for drug screening as single cells, since not all single cells are able to grow as organoids. During the manipulation of the organoids for drug screening, we recommend supplementing the washing medium with RhoKi 10 µm to reduce the stress that generates on organoids that are not surrounded by ECM. We do not recommend storing organoids on ice while collecting all material.
Higher throughput for drug screening can be achieved by studying organoid in HTS microplates (e.g. 384-well plates) coated with Corning Matrigel matrix, using the “sandwich” method or embedded method (refer to Corning CLS Guideline for use SPC-356255-G). You can also refer to the article, “Assay Establishment and Validation of a High-Throughput Screening Platform for Three-Dimensional Patient-Derived Colon Cancer Organoid Cultures”, which reports the establishment and validation of a high-throughput screening platform in a 384-well format for 3D organoid culture derived from colon cancer patients.
We are using the media from Hans Clever’s paper to grow hepatocyte-based organoids. How often do you recommend media changes? We are seeing that some of our organoids are dying right after media changes, every 2-3 days.
To support organoid growth, we recommend refreshing media every 2-3 days. Some of the compounds used are not very stable after several days at 37°C. The observation that organoids die right after medium refreshment suggests that a revision or optimization to the media formulation is needed. You also may need to optimize the final concentration of reagents, since the death of the organoids is unexpected if these formulations are all correct.
Do you have a protocol for turning cancer cell spheroids into organoids?
Although the generation of organoids from cancer cells seems contradictory, researchers now are focusing on this approach to study the heterogeneity found in cancers as well as for the development of personalized medicine. Cancer organoids can recapitulate organ function and express organ specific markers, as demonstrated in the following paper: Patient-derived lung cancer organoids as in vitro cancer models for therapeutic screening.
Several papers are available in which the generation of organoids from cancer biopsy of patients are described. For example: Cancer Sample Biobanking at the Next Level: Combining Tissue With Living Cell Repositories to Promote Precision Medicine.
Information on the generation of organoids from spheroids is, probably due to the nature of spheroids, more limited. However, it has been described that “intestinal” spheroids can form into organoids in the following paper, A process engineering approach to increase organoid yield.
I am working on a multi-step long term experiment where I need to cryopreserve my organoids and then thaw them about a month later. I am trying to find the best way to do this.
Cryopreservation of organoids becomes more and more important to improve organoid-based therapy and for acquiring large numbers of cells. Please find here an article in which the cryopreservation of intestinal organoids either undissociated or dissociated is described: Long-term culture-induced phenotypic difference and efficient cryopreservation of small intestinal organoids by treatment timing of Rho kinase inhibitor.
Interestingly, protocols to freeze can differ when using mouse or human organoids. Here is a protocol handbook that describes organoid culture including those for cryopreservation of human and mouse organoids.
Additionally, we have observed a significant increase in cell survival after thawing of organoids, after being processed as described in the Tuveson lab protocol, step 1 to a small size (between 30-40 µm), organoids are plated in 55% extracellular matrix (ECM) drops for 1-2 days. With this plating step, we let organoids recover from the stress of disruption, but also activate the proliferations state right before freezing. After 1-3 days (depends on the human organoid model, for instance after 1 day some organoids are visually increasing in size (colon), while others need three days (lung or breast). We collect them from the ECM drop and freeze them following the steps indicated in step 3 onwards. We have observed that the presence of some ECM in the pellet does not have a negative impact in the survival of the organoids, so extra washes to remove ECM are not required. We recommend aspirating the ECM free of organoids from the pellet.
I am not very familiar with culturing on chips. How does this work compare to regular culture?
When working with more complex organoid models, there are many important factors to consider including the extracellular matrix, fluid transportation, controlled medium exchange and spatial separation. For these more advanced models, the combined usage of extracellular matrices with a “organ on a chip” method may prove useful. The chip serves as a “scaffold” which can be used to create compartments.
Please find here a few examples of organoids cultured on a chip:
- Gut-on-a-Chip microenvironment induces human intestinal cells to undergo villus differentiation
Intestinal organoids: Use of a chip allows the culture to have an apical and basolateral side, allowing cells to show increased markers of intestinal cells.
- Interstitial flow regulates the angiogenic response and phenotype of endothelial cells in a 3D culture model
Blood vessel formation: To date the formation of blood vessels has only been successfully demonstrated in 3D cell culture. In combination with a chip, the interstitial fluid flow, shear stress, and growth factor gradients could be mimicked.
How does the cost of culturing organoids compare to 2D culture? What about time and lab resources?
This question is particularly difficult to answer as there are no “standard” 2D or 3D cell culture protocols in which the format, volumes and protocols are comparable. In general, cell culture products used for 2D are less advanced than products offered for 3D cell culture and therefore, the direct cost for 3D cell culture are typically more than for an experiment with a conventional monolayer culture. Additionally, within a few days, a simple monolayer of cells can be formed; the generation of 3D cell structures like organoids might take up to several days, but during this period no elaborate steps need to be conducted by the cell culture personnel.
However, there are certain applications where conventional 2D experiments will not lead to the same rich answers as experiments conducted in 3D cell culture, as cells grown in 3D more closely mimic in vivo behavior in tissues and organs. 3D cell culture environments create more biologically relevant models for drug discovery which may lead to more predictive results, higher success rates for drug compound testing, a faster path to market, and reduced development costs. If you are interested in setting up 3D cell culture and the generation of organoids in your lab, products and solutions are available that make starting with 3D cell culture easy, e.g. Corning spheroid plates or Corning Matrigel matrix for organoid culture.
Other resources on 3D Cell Culture:
- All About Organoids e-book
- Explore Organoid Model Environments
- Citations on Corning Matrigel Matrix and Organoid Culture
- Working Successfully with Organoids
- Explore Spheroid Model Environments
- Citations on Corning Spheroid Microplates with Ultra-Low Attachment Surface
- Spheroid Culture Advancements
Organoid culture is dependent on matrices/scaffolds, typically Corning Matrigel matrix, which itself can provide many growth factors, etc. that contributes to organoid growth/differentiation. Are there alternative, less bioactive matrices that can support organoid culture?
At Hubrecht Organoid Technology, Corning Matrigel matrix has been by far the best extracellular matrix (ECM) supporting the expansion of the organoid models. To reduce variability generated by the presence of grow factors or other proteins/molecules that could impact organoid growth, we always work with growth factor-reduced and phenol red free versions of Matrigel matrix. We have looked for a synthetic alternative to biological extracellular matrices, but to date nothing we have tested supports the growth of organoids to a comparable level as Matrigel matrix.
To support the reproducibility and consistency essential for organoid research, Corning recently launched Matrigel matrix for organoid culture. This optimized formulation is verified to support growth and differentiation of organoids with each lot measured for matrix stiffness, a property that supports organoid workflow. Matrigel matrix for organoid culture has been demonstrated to successfully grow organoids from both healthy and diseased cell origins. Each lot is qualified to form stable “3D dome” structures commonly used in organoid culture.
Can you explain when you would want to use serum-free for organoid culture or when it is ok to use media with serum.
When expanding organoids under defined conditions, we recommend avoiding the use of serum. In all medium recipes developed by the lab of Hans Clevers, the presence of serum is found when the tissue-specific organoid model requires the presence of Wnt3a (i.e. human intestinal models). The Wnt3a conditioned medium contains 5% fetal bovine system (FBS) and it has been the most robust way to produce active Wnt3a. Luckily, alternative sources of serum-free Wnt3a are becoming available, such as Surrogate Wnt (Garcia lab, Stanford), making possible to expand organoids in the absence of serum.
Diffusion kinetics and organoid health and size- what are some culture strategies to improve this to allow culture of larger organoids? In the same vein- strategies to support long term culture of organoids, mimic vascularization?
Diffusion kinetics can regulate organoid size and health: upon reaching a certain size, organoids have arrested growth and develop a necrotic core. This process is possibly linked to a switch from a proliferative, stem-like state to a non-proliferative, diﬀerentiated state, as well as necrosis of the organoid core. Terminal diﬀerentiation can be a strategy to limit organoid size but preventing a necrotic core is crucial for organoid health as it could lead to premature differentiation. Perfusion/flow of nutrients around the organoids is a technology that has been discussed in scientific literature to assist with prevention of necrotic core. Organoid vascularization is an important criterion for long term culture; seeding endothelial cells within the system to allow for formation of blood vessels (neo-angiogenesis) as well as using bioprinting to engineer the architecture and placement of cells are important platforms that are being explored towards this objective.