Name: organoid-derived epithelial monolayer: a clinically relevant in vitro model for intestinal barrier function
Uploaded: 2021-07-29T13:00:00
Description: Watch this Scientific Journal Video about Organoid-Derived Epithelial Monolayer: A Clinically Relevant In Vitro Model for Intestinal Barrier Function at JoVE.com

This work is supported by the Topsector Life Sciences &#38; Health - Topconsortium voor Kennis en Innovatie Health~Holland (LSH-TKI) public-private partnerships (PPP) allowance of the Dutch LSH sector with Project number LSHM16021 Organoids as novel tool for toxicology modelling to Hubrecht Organoid Technology (HUB) and HUB internal funding to Disease Modeling and Toxicology department. We thank the laboratories of Sabine Middendorp (Division of Pediatric Gastroenterology, Wilhelmina Children&#39;s Hospital, UMC, Utrecht) and Hugo R. de Jonge and Marcel J.C. Bijvelds (Department of Gastroenterology and Hepatology, Erasmus MC, Rotterdam) for providing initial technical support to set up monolayers on membrane inserts.

1. Preparing reagents for culture
NOTE: Perform all steps inside a biosafety cabinet and follow standard guidelines for working with cell cultures. Ultraviolet light is used for 10 min before starting up the biosafety cabinet. Before and after use, the surface of the biosafety cabinet is cleaned with a tissue paper drenched in 70% ethanol. To facilitate the formation of three-dimensional drops of extracellular matrix (ECM), keep a prewarmed stock of 96-, 24-, and 6-well plates ready in the incub...

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This protocol describes the general manipulation and maintenance of intestinal organoids as well as the preparation and possible applications of epithelial monolayers derived from these organoids. To date, monolayers have been successfully prepared from the duodenum, ileum, and different regions of colon organoids derived from normal as well as previously and actively inflamed intestinal tissue (unpublished data). The application of patient-derived organoid monolayers facilitates the study of barrier function in a diseas...

The intestinal epithelium acts as a physical barrier between the luminal content of the intestines and the underlying tissue. This barrier comprises a single epithelial layer of mainly absorptive enterocytes that are connected by tight junctions, which establish strong intercellular connections between adjacent cells. These cells form a polarized epithelial lining that separates the apical (lumen) and basolateral sides of the intestine, while simultaneously regulating paracellular transport of digested nutrients and metabolites. In addition to enterocytes, other important epithelial cells such as goblet, Paneth, and enteroendocrine cells also contribute to intestinal homeostasis by producing mucus, antimicrobial peptides, and hormones, respectively. The intestinal epithelium is constantly replenished by dividing leucine-rich repeat-containing G-protein-coupled receptor 5-positive (LGR5+) stem cells in the bottom of intestinal crypts producing transit-amplifying (TA) cells that migrate upwards and differentiate into other cell types1. Disruption of intestinal epithelial homeostasis by genetic and environmental factors, such as exposure to food allergens, medicinal compounds, and microbial pathogens, leads to disruption of intestinal barrier function. These conditions cause several intestinal diseases including inflammatory bowel disease (IBD), celiac disease, and drug-induced GI toxicity2.
Studies on the intestinal epithelium are performed using several in vitro platform systems such as membrane inserts, organs-on-a-chip systems, Ussing chambers, and intestinal rings.These platforms are suitable for establishing polarized epithelial monolayers with access to both apical and basolateral sides of the membrane, using transformed cell lines or primary tissue as models. Although transformed cell lines, such as the colorectal (adeno)carcinoma cell lines Caco-2, T84, and HT-29, are able to differentiate into polarized intestinal enterocytes or mucus-producing cells to some extent, they are not representative of the in vivo&#160;epithelium as several cell types are missing, and various receptors and transporters are aberrantly expressed3. In addition, as cell lines are derived from a single donor, they do not represent interpatient heterogeneity and suffer from reduced complexity and physiological relevance. Although primary tissues used in Ussing chambers and as intestinal rings are more representative of the in vivo&#160;situation, their limited availability, short-term viability, and lack of expandability make them unsuitable as a medium for high-throughput (HT) studies.
Organoids are in vitro epithelial cultures established from different organs such as the intestine, kidney, liver, pancreas, and lung. They are proven to have long-term, stable expandability as well as genetic and phenotypic stability and therefore are representative biological miniatures of the epithelium of the original organ with faithful responses to external stimuli4,5,6,7,8,9. Organoids are efficiently established from either resected or biopsied normal, diseased, inflamed, or cancerous tissue, representing heterogeneous patient-specific responses10,11,12,13,14,15,16. This paper demonstrates how to establish intestinal epithelial monolayers derived from organoid cultures. Monolayers have been successfully established from small intestinal as well as colonic and rectal organoid cultures. This model creates an opportunity to study the transport and permeability of the epithelial cells to drugs as well as their toxicological effects on the epithelium. Moreover, the model allows co-culture with immune cells and bacteria to study their interactions with the intestinal epithelium17,18,19. Furthermore, this model can be used to study responses to therapies in a patient-specific manner and initiate screening efforts to look for the next wave of epithelial barrier-focused therapeutics. Such an approach could be extended to the clinic and pave the way toward personalized treatments.
Although the epithelial monolayers in this protocol are prepared from human normal intestinal organoids, the protocol can be applied and optimized for other organoid models. Epithelial organoid monolayers are cultured in intestinal organoid expansion medium containing Wnt to support stem cell proliferation and represent intestinal crypt cellular composition. Intestinal organoids can be enriched to have different intestinal epithelial fates, such as enterocytes, Paneth, goblet, and enteroendocrine cells, by modulating Wnt, Notch, and epidermal growth factor (EGF) pathways. Here, after the establishment of monolayers in expansion medium, they are driven toward more differentiated intestinal epithelial cells, as described previously20,21,22,23,24,25. For screening purposes, depending on the mode of action of the compound of interest, its target cells, and the experimental conditions, the monolayers can be driven toward the cellular composition of choice to measure the effects of the compound with relevant functional readouts.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>100% ethanol</td>
			<td>Fisher Emergo</td>
			<td>10644795</td>
			<td></td>
		</tr>
		<tr>
			<td>1250, 300, and 20 &#181;L low-retention filter-tips</td>
			<td>Greiner bio-one</td>
			<td>732-1432 / 732-1434 / 732-2383</td>
			<td></td>
		</tr>
		<tr>
			<td>15 mL conical tubes</td>
			<td>Greiner bio-one</td>
			<td>188271</td>
			<td></td>
		</tr>
		<tr>
			<td>24-well cell culture plates</td>
			<td>Greiner bio-one</td>
			<td>662160</td>
			<td></td>
		</tr>
		<tr>
			<td>24-well HTS Fluoroblok Transwell plate (light-tight)</td>
			<td>Corning</td>
			<td>351156</td>
			<td rowspan="2">Plates require REMS AutoSampler for TEER measurements</td>
		</tr>
		<tr>
			<td>24-well HTS Transwell plates (Table 1)</td>
			<td>Corning</td>
			<td>3378</td>
		</tr>
		<tr>
			<td>24-well plate with Transwell inserts</td>
			<td>Corning</td>
			<td>3470</td>
			<td>membrane inserts</td>
		</tr>
		<tr>
			<td>40 &#181;m cell strainer</td>
			<td>PluriSelect</td>
			<td>43-50040-01</td>
			<td></td>
		</tr>
		<tr>
			<td>50 mL conical tubes</td>
			<td>Greiner bio-one</td>
			<td>227261</td>
			<td></td>
		</tr>
		<tr>
			<td>6-well cell culture plates</td>
			<td>Greiner bio-one</td>
			<td>657160</td>
			<td></td>
		</tr>
		<tr>
			<td>96-well black plate transparent bottom</td>
			<td>Greiner bio-one</td>
			<td>655090</td>
			<td></td>
		</tr>
		<tr>
			<td>96-well fast thermal cycling plates</td>
			<td>Life Technologies Europe BV</td>
			<td>4346907</td>
			<td></td>
		</tr>
		<tr>
			<td>96-well HTS Fluoroblok Transwell plate</td>
			<td>Corning</td>
			<td>351162</td>
			<td></td>
		</tr>
		<tr>
			<td>96-well HTS Transwell plates (Table 1)</td>
			<td>Corning</td>
			<td>7369</td>
			<td></td>
		</tr>
		<tr>
			<td>96-well transparent culture plate</td>
			<td>Greiner bio-one</td>
			<td>655180</td>
			<td></td>
		</tr>
		<tr>
			<td>A83-01</td>
			<td>Bio-Techne Ltd</td>
			<td>2939</td>
			<td></td>
		</tr>
		<tr>
			<td>Accutase Cell Dissociation Reagent</td>
			<td>Life Technologies Europe BV</td>
			<td>A11105-01</td>
			<td></td>
		</tr>
		<tr>
			<td>Advanced DMEM/F-12</td>
			<td>Life Technologies Europe BV</td>
			<td>12634028</td>
			<td></td>
		</tr>
		<tr>
			<td>B27 supplement</td>
			<td>Life Technologies Europe BV</td>
			<td>17504001</td>
			<td></td>
		</tr>
		<tr>
			<td>Cell culture microscope (light / optical microscope)</td>
			<td>Leica</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>CellTiter-Glo</td>
			<td>Promega</td>
			<td>G9683</td>
			<td></td>
		</tr>
		<tr>
			<td>Centrifuge</td>
			<td>Eppendorf</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>CO2 incubator</td>
			<td>PHCBI</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>DAPT</td>
			<td>Sigma-Aldrich</td>
			<td>D5942</td>
			<td></td>
		</tr>
		<tr>
			<td>DEPC treated H2O</td>
			<td>Life Technologies Europe BV</td>
			<td>750024</td>
			<td></td>
		</tr>
		<tr>
			<td>Dulbecco&#39;s phosphate-buffered saline (DPBS) with Ca2+ and Mg2+</td>
			<td>Life Technologies Europe BV</td>
			<td>14040091</td>
			<td></td>
		</tr>
		<tr>
			<td>DPBS, powder, no calcium, no magnesium</td>
			<td>Life Technologies Europe BV</td>
			<td>21600069</td>
			<td></td>
		</tr>
		<tr>
			<td>EnzChek Lysozyme Assay Kit</td>
			<td>Life Technologies Europe BV</td>
			<td>E22013</td>
			<td></td>
		</tr>
		<tr>
			<td>EVOM2 meter with STX electrode</td>
			<td>WTI</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Gastrin</td>
			<td>Bio-Techne Ltd</td>
			<td>3006</td>
			<td></td>
		</tr>
		<tr>
			<td>Glass pipettes</td>
			<td>Volac</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>GlutaMAX</td>
			<td>Life Technologies Europe BV</td>
			<td>35050038</td>
			<td></td>
		</tr>
		<tr>
			<td>hEGF</td>
			<td>Peprotech</td>
			<td>AF-100-15</td>
			<td></td>
		</tr>
		<tr>
			<td>HEPES</td>
			<td>Life Technologies Europe BV</td>
			<td>15630056</td>
			<td></td>
		</tr>
		<tr>
			<td>Human Noggin</td>
			<td>Peprotech</td>
			<td>120-10C</td>
			<td></td>
		</tr>
		<tr>
			<td>Human Rspo3</td>
			<td>Bio-Techne Ltd</td>
			<td>3500-RS/CF</td>
			<td></td>
		</tr>
		<tr>
			<td>IWP-2</td>
			<td>Miltenyi Biotec</td>
			<td>130-105-335</td>
			<td></td>
		</tr>
		<tr>
			<td>Ki67 primary antibody</td>
			<td>Sanbio</td>
			<td>BSH-7302-100</td>
			<td></td>
		</tr>
		<tr>
			<td>Ki67 secondary antibody</td>
			<td>Agilent</td>
			<td>K400111-2</td>
			<td></td>
		</tr>
		<tr>
			<td>Kova International Glasstic Slide with Counting grids</td>
			<td>Fisher Emergo</td>
			<td>10298483</td>
			<td></td>
		</tr>
		<tr>
			<td>Laminar flow hood</td>
			<td>Thermo scientific</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Lucifer Yellow CH dilithium salt</td>
			<td>Sigma-Aldrich</td>
			<td>L0259</td>
			<td></td>
		</tr>
		<tr>
			<td>Matrigel, Growth Factor Reduced (GFR)</td>
			<td>Corning</td>
			<td>356231</td>
			<td>extracellular matrix (ECM)</td>
		</tr>
		<tr>
			<td>MicroAmp Fast 8-Tube Strip, 0.1 mL</td>
			<td>Life Technologies Europe BV</td>
			<td>4358293</td>
			<td></td>
		</tr>
		<tr>
			<td>MicroAmp Optical 8-Cap Strips</td>
			<td>Life Technologies Europe BV</td>
			<td>4323032</td>
			<td></td>
		</tr>
		<tr>
			<td>Microcentrifuge tubes</td>
			<td>Eppendorf</td>
			<td>0030 120 086</td>
			<td></td>
		</tr>
		<tr>
			<td>Micropipettes (1000, 200, and 20 &#181;L)</td>
			<td>Gilson</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Microtome</td>
			<td>Leica</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>MUC2 primary antibody</td>
			<td>Santa Cruz Biotechnology</td>
			<td>sc-15334</td>
			<td></td>
		</tr>
		<tr>
			<td>MUC2 secondary antibody</td>
			<td>VWR</td>
			<td>VWRKS/DPVR-HRP</td>
			<td></td>
		</tr>
		<tr>
			<td>Multichannel pipette (200 &#181;L)</td>
			<td>Gilson</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>N-acetylcysteine</td>
			<td>Sigma-Aldrich</td>
			<td>A9165</td>
			<td></td>
		</tr>
		<tr>
			<td>NGS Wnt</td>
			<td>U-Protein Express</td>
			<td>N001-0.5mg</td>
			<td></td>
		</tr>
		<tr>
			<td>Nicotinamide</td>
			<td>Sigma-Aldrich</td>
			<td>N0636</td>
			<td></td>
		</tr>
		<tr>
			<td>Oligonucleotide ALPI1/Forward</td>
			<td>Custom-made</td>
			<td>GGAGTTATCCTGCTCCCCAC</td>
			<td></td>
		</tr>
		<tr>
			<td>Oligonucleotide ALPI1/Reverse</td>
			<td>Custom-made</td>
			<td>CTAGGAGGTGAAGGTCCAACG</td>
			<td></td>
		</tr>
		<tr>
			<td>Oligonucleotide LGR5/Forward</td>
			<td>Custom-made</td>
			<td>ACACGTACCCACAGAAGCTC</td>
			<td></td>
		</tr>
		<tr>
			<td>Oligonucleotide LGR5/Reverse</td>
			<td>Custom-made</td>
			<td>GGAATGCAGGCCACTGAAAC</td>
			<td></td>
		</tr>
		<tr>
			<td>Oligonucleotide MUC2/Forward</td>
			<td>Custom-made</td>
			<td>AGGATCTGAAGAAGTGTGTCACTG</td>
			<td></td>
		</tr>
		<tr>
			<td>Oligonucleotide MUC2/Reverse</td>
			<td>Custom-made</td>
			<td>TAATGGAACAGATGTTGAAGTGCT</td>
			<td></td>
		</tr>
		<tr>
			<td>Oligonucleotide TBP/Forward</td>
			<td>Custom-made</td>
			<td>ACGCCGAATATAATCCCAAGCG</td>
			<td></td>
		</tr>
		<tr>
			<td>Oligonucleotide TBP/Reverse</td>
			<td>Custom-made</td>
			<td>AAATCAGTGCCGTGGTTCGTG</td>
			<td></td>
		</tr>
		<tr>
			<td>Optical adhesive covers</td>
			<td>Life Technologies Europe BV</td>
			<td>4311971</td>
			<td></td>
		</tr>
		<tr>
			<td>PD0325901</td>
			<td>Stemcell Technologies</td>
			<td>72184</td>
			<td></td>
		</tr>
		<tr>
			<td>Penicillin/streptomycin</td>
			<td>Life Technologies Europe BV</td>
			<td>15140122</td>
			<td></td>
		</tr>
		<tr>
			<td>Plate shaker</td>
			<td>Panasonic</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>PowerUp SYBR Green Master Mix</td>
			<td>Fisher Emergo</td>
			<td>A25776</td>
			<td></td>
		</tr>
		<tr>
			<td>Primocin</td>
			<td>InvivoGen</td>
			<td>ANT-PM-2</td>
			<td>antimicrobial formulation for primary cells</td>
		</tr>
		<tr>
			<td>Qubit RNA HS Assay Kit</td>
			<td>Life Technologies Europe BV</td>
			<td>Q32852</td>
			<td></td>
		</tr>
		<tr>
			<td>Reagent reservoir for multichannel pipet</td>
			<td>Sigma-Aldrich</td>
			<td>CLS4870</td>
			<td></td>
		</tr>
		<tr>
			<td>REMS AutoSampler with 24-probe or 96C-probe</td>
			<td>WTI</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Richard-Allan Scientific Alcian Blue/PAS Special Stain Kit</td>
			<td>Thermo scientific</td>
			<td>87023</td>
			<td></td>
		</tr>
		<tr>
			<td>RNase-Free DNase Set</td>
			<td>Qiagen</td>
			<td>79254</td>
			<td></td>
		</tr>
		<tr>
			<td>RNeasy Mini Kit</td>
			<td>Qiagen</td>
			<td>74106</td>
			<td></td>
		</tr>
		<tr>
			<td>SB202190</td>
			<td>Sigma-Aldrich</td>
			<td>S7076</td>
			<td></td>
		</tr>
		<tr>
			<td>Serological pipettes</td>
			<td>Greiner bio-one</td>
			<td>606180 / 607180 / 760180</td>
			<td></td>
		</tr>
		<tr>
			<td>Serological pipettor (Pipet-Aid)</td>
			<td>Drummond</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Single edge razor blade</td>
			<td>GEM Scientific</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Superscript 1st strand system for RT-PCR</td>
			<td>Life Technologies Europe BV</td>
			<td>11904018</td>
			<td></td>
		</tr>
		<tr>
			<td>Tecan Spark 10M plate reader</td>
			<td>Tecan</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Trypan Blue Solution, 0.4%</td>
			<td>Life Technologies Europe BV</td>
			<td>15250-061</td>
			<td></td>
		</tr>
		<tr>
			<td>TrypLE Express Enzyme (1x)</td>
			<td>Life Technologies Europe BV</td>
			<td>12605-010</td>
			<td>Cell dissociation reagent</td>
		</tr>
		<tr>
			<td>Water bath</td>
			<td>Grant</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Y27632 (ROCK inhibitor)</td>
			<td>AbMole</td>
			<td>M1817</td>
			<td></td>
		</tr>
	</tbody>
</table>

organoid-derived epithelial monolayer: a clinically relevant in vitro model for intestinal barrier function

In the past, intestinal epithelial model systems were limited to transformed cell lines and primary tissue. These model systems have inherent limitations as the former do not faithfully represent original tissue physiology, and the availability of the latter is limited. Hence, their application hampers fundamental and drug development research. Adult stem-cell-based organoids (henceforth referred to as organoids) are miniatures of normal or diseased epithelial tissue from which they are derived. They can be established very efficiently from different gastrointestinal (GI) tract regions, have long-term expandability, and simulate tissue- and patient-specific responses to treatments in vitro. Here, the establishment of intestinal organoid-derived epithelial monolayers has been demonstrated along with methods to measure epithelial barrier integrity, permeability and transport,&#160;antimicrobial protein secretion, as well as histology. Moreover, intestinal organoid-derived monolayers can be enriched with proliferating stem and transit-amplifying cells as well as with key differentiated epithelial cells. Therefore, they represent a model system that can be tailored to study the effects of compounds on target cells and their mode of action. Although organoid cultures are technically more demanding than cell lines, once established, they can reduce failures in the later stages of drug development as they truly represent in vivo epithelium complexity and interpatient heterogeneity.

Figure 1A shows a representative brightfield image of intestinal organoids after thawing them from a cryovial. It is important to thaw organoids at a high density to ensure optimal recovery. Organoids are plated in 24- or 6-well plates in ECM domes of approximately 10 &#181;L (Figure 1B). Most normal intestinal organoids have a cystic morphology. After recovering from the thawing process, the organoids grow to a bigger size and are ready to be passaged after 3-7...

Watch this Scientific Journal Video about Organoid-Derived Epithelial Monolayer: A Clinically Relevant In Vitro Model for Intestinal Barrier Function at JoVE.com

Organoid-Derived Epithelial Monolayer: A Clinically Relevant In Vitro Model for Intestinal Barrier Function

Here, we describe the preparation of human organoid-derived intestinal epithelial monolayers for studying intestinal barrier function, permeability, and transport. As organoids represent original epithelial tissue response to external stimuli, these models combine the advantages of expandability of cell lines and the relevance and complexity of primary tissue.

In the past, intestinal epithelial model systems were limited to transformed cell lines and primary tissue. These model systems have inherent limitations ...

Organoid-derived monolayers recapitulate patient's intestinal epithelial barrier function and allow to test the effect of therapies aimed at enhancing dysfunction in each patient to identify personalized treatment strategies. Organoid monolayers provide access to the apical side of the epithelium, which is the side where the damage occurs, and it's normal and accessible in organoids growing as 3D structures. Every organoid is different, hence the struggle.To form tight monolayers, use organoids in proliferation phase and digest quickly to form clusters of two to four cells. Titrate the cell seeding for every model. Demonstrating the procedure will be done by Wies Van Dooremalen, a senior research associate of HUB.Begin by coating membrane inserts with extracellular matrix or ECM. Working in a biosafety cabinet, place the membrane inserts into the support plate. Dilute the ECM 40X in ice cold DPBS with calcium and magnesium, then pipette 150 microliters of the diluted ECM into the apical compartment of each insert.Incubate the plate at 37 degrees Celsius for at least one hour. To prepare the cells for seeding, prewarm an aliquot of cell dissociation reagent in a 37 degree Celsius water bath. Use two milliliters of the reagent for each well of a six-well plate.Transfer the culture plate containing the organoids from the incubator to the biosafety cabinet. Process the organoids as described in the text manuscript, but do not pool multiple tubes into one tube. After harvesting the organoids, add basal medium or BM to 12 milliliters and centrifuge at 85 times G, then aspirate the supernatant.Fill the tube containing the organoids with up to 12 milliliters of DPBS, then pipette up and down 10 times using a 10 milliliter pipette. Centrifuge at 85 times G for five minutes at eight degrees Celsius and aspirate the supernatant without disturbing the organoid pellet. Add the pre-warmed cell dissociation reagent to the organoids and resuspend them, then incubate the tubes diagonally or horizontally for five minutes in the water bath at 37 degrees Celsius.After the incubation, pipette up and down 10 times using a five milliliter sterile plastic pipette or a P1000 pipette. Check the organoid suspension under the microscope to see if a mixture of single cells and some cell clumps consisting of two to four cells has formed. Stop cell dissociation by adding up to 12 milliliters of BM with ROCK inhibitor to the cell suspension.Centrifuge the cells, then aspirate the supernatant without disturbing the cell pellet. When handling the same organoid culture in several tubes, pool the cell pellets before resuspending them in 12 milliliters of BM.Filter the cell suspension through a 40 micrometer strainer pre-wetted with BM and harvest the flow-through into a 50 milliliter conical tube, then wash the strainer with 10 milliliters of BM and harvest the flow-through into the same tube. Transfer the strained cell suspension into two new 15 milliliter conical tubes and repeat the centrifugation.Aspirate the supernatant without disturbing the cell pellet and resuspend the cells in four milliliters of IEM supplemented with 10 micromolar ROCK inhibitor per full culture plate used as starting material. Mix a small amount of cell suspension in a one-to-one ratio with Trypan Blue for counting, then count the cells and calculate the total number of live cells, counting each individual cell in small clumps. Prepare a cell suspension containing 3X 10 to the sixth live cells per milliliter of IEM supplemented with 10 micromolar ROCK inhibitor.To seed the cells, carefully aspirate DPBS from the ECM-coated inserts, keeping the plate horizontal. Pipette 800 microliters of IEM supplemented with ROCK inhibitor into each basolateral compartment and 150 microliters of the cell suspension prepared onto the ECM-coated membrane in the apical compartment dropwise. Place the plate in the incubator at 37 degrees Celsius and 5%carbon dioxide.Once the cells have sedimented onto the membrane, measure transepithelial electrical resistance or TEER every day and image the membrane inserts using a microscope. To refresh the monolayers, remove the medium from the basolateral compartments of the plate containing the membrane inserts, then carefully aspirate the medium from the apical compartments. Add 150 microliters of fresh IEM dropwise to each apical compartment and add 800 microliters of fresh IEM to each basolateral compartment.If using a manual TEER meter, clean the electrode with 70%ethanol and let it air dry inside the biosafety cabinet, then place the electrode in a tube containing BM.Connect the electrode to the manual TEER meter and turn the function switch to measure in ohms and the power switch on. Place the short electrode in the apical compartment of the insert and the long electrode in the basolateral compartment without touching the monolayer. Measure resistance in the blank well, then in the remaining samples.Wash the electrode with BM between samples with different conditions. When finished, clean the electrode with demi water and with 70%ethanol, then let it air dry. This protocol was used to harvest intestinal organoids and prepare monolayers of epithelial cells.A monolayer that was cultured for eight days in IEM is shown here. A structure can be observed when exposing monolayers to enterocyte differentiation medium or EDM, while monolayers exposed to combination medium or CDM show a smoother structure. Monolayer formation was quantitatively followed by measuring TEER.A completely confluent monolayer had a TEER value of approximately 100 ohms centimeter squared which increased when exposed to either differentiation medium. Monolayers in all medium conditions showed a lower apparent permeability to Lucifer yellow. Lysozyme secretion by ileal monolayers cultured in IEM was higher than that of monolayers cultured in IEM until confluent and for another four days in EDM or CDM.Monolayers cultured in IEM, IEM and subsequent EDM, or IEM and subsequent CDM show differences in morphology which was observed with H&E, Ki67, MUC2, and Alcian Blue stainings. Upon differentiation, proliferative cells decreased, while goblet cell and enterocyte marker gene expression increased in comparison to that observed under IEM conditions as shown by LGR5, MUC2, and alkaline phosphatase gene expression. When preparing monolayers, it is important to prevent anoikis in the organoids after digesting them.Additionally, ECM in cells should be evenly distributed on the Transwell membranes. Organoid-derived monolayers allow the evaluation of molecule transports using different fluorescent substrates in a patient-specific manner.

Research

JoVE Journal

Biology

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