Human Gastric Organoid Culture Protocol
Introduction
This protocol provides a procedure for subculturing normal human gastric organoids. This protocol was modified from the submerged method described in Bartfeld, S. et al. (2015) In vitro expansion of human gastric epithelial stem cells and their responses to bacterial infection. Gastroenterology 148:126.
The protocol provided below is intended to culture organoids from normal human gastric tissues using Cultrex™ UltiMatrix Reduced Growth Factor (RGF) Basement Membrane Extract as a scaffold. The majority of reagents used in this protocol were sourced from the Bio-Techne brands of R&D Systems™ and Tocris Bioscience™.
Equipment
- Cell culture incubator (37 °C, 5% CO2)
- Cell culture hood with laminar flow
- Centrifuge with refrigeration and swinging bucket rotor
- 37 °C water bath
- Ice bucket
- Laboratory refrigerator
- Mini cell scraper, sterile
- Pipet aid and serological pipettes (5 mL)
- Micropipettes and tips (2–200 μL)
- Conical tubes, 15 mL and 50 mL, sterile
- Cell strainer, 100 μm, sterile
- 24-well plate, tissue-culture treated, sterile
- Vacuum pump
- Medium filtration unit, 0.1 μm, 500 mL, sterile
- Syringe, 50 mL, sterile
- Syringe filter, 0.2 μm, sterile
- Cell culture waste container
Other Required Reagents
- Distilled (DW) or deionized water (DI)
- Phosphate buffered saline (PBS)
- 1% Ammonium
- 1% BSA/PBS
- DMSO
Materials
TABLE 1. Materials Needed for Human Gastric Organoid Culture
Product Name | Supplier | Catalog # |
| Cultrex Organoid Harvesting Solution | R&D Systems | 3700-100-01 |
| Cultrex UltiMatrix Reduced Growth Factor Basement Membrane Extract | R&D Systems | BME001-05 |
| Advanced DMEM/F-12 Cell Culture Medium | Thermo Fisher | 12634010 |
| GlutaminePlus | R&D Systems | B90210 |
| HEPES | Tocris Bioscience | 3173 |
| Penicillin-Streptomycin | R&D Systems | B21210 |
| N21-MAX Supplement | R&D Systems | AR008 |
| N-2 MAX Supplement | R&D Systems | AR009 |
| N-Acetylcysteine | Tocris Bioscience | 7874 |
| Fetal Bovine Serum (FBS) | Various | Various |
| Gastrin I (Human) | Tocris Bioscience | 3006 |
| SB 202190 (p38 MAPK inihibitor) | Tocris Bioscience | 1264 |
| Nicotinamide | Tocris Bioscience | 4106 |
| Human Insulin, Solution | Sigma-Aldrich | I9278 |
| Human Transferrin | Sigma-Aldrich | T8158 |
| Y-27632 dihydrochloride (Rho Kinase inhibitor) | Tocris Bioscience | 1254 |
| A 83-01 (ALK5 inhibitor) | Tocris Bioscience | 2939 |
| CHIR 99021 (GSK-3 inhibitor) | Tocris Bioscience | 4423 |
| Recombinant Human EGF | R&D Systems | 236-EG |
| Recombinant Human R-Spondin 1 | R&D Systems | 4645-RS |
| Recombinant Human Noggin | R&D Systems | 6057-NG |
| Recombinant Human FGF-10 | R&D Systems | 345-FG |
| Recombinant Human Wnt-3a | R&D Systems | 5036-WN |
Reagent Preparation
Use aseptic technique at all times during this protocol. This protocol is optimized for human gastric organoids. Organoids from other tissues may have different culture requirements.
1. Prepare stock solutions for gastric organoid culture, as indicated in TABLE 2.
TABLE 2. Preparation of Stock Solutions for Gastric Organoid Culture Medium
Reagent Name |
Solvent |
Stock Solution |
Preparation |
Storage |
| N-Acetylcysteine | DI water | 500 mM = 81.6 mg/mL | 200 mg in 2.4 mL | 4 °C |
| GlutaminePlus | PBS | 200 mM = 29.2 mg/mL | 1.46 g in 50 mL | 4 °C |
| Gastrin I (Human) | 1% Ammonia with sonication | 100 µM = 210 µg/mL | 500 µg in 2.38 mL | -20 °C |
| Recombinant Human EGF | 1% BSA/PBS | 500 µg/mL | 200 µg in 400 µL | -80 °C |
| Recombinant Human R-Spondin 1 | 1% BSA/PBS | 1 mg/mL | 1 mg in 1 mL | -80 °C |
| Recombinant Human Noggin | 1% BSA/PBS | 100 µg/mL | 100 µg in 1 mL | -80 °C |
| Recombinant Human FGF-10 | 1% BSA/PBS | 100 µg/mL | 100 µg in 1 mL | -80 °C |
| A 83-01 | DMSO | 25 mM = 10.54 mg/mL | 10 mg in 949 µL | -20 °C |
| SB 202190 | DMSO | 30 mM = 9.9 mg/mL | 5 mg in 505 µL | 4 °C |
| Nicotinamide | DW | 1 M = 122.12 mg/mL | 6.1 g in 50 mL | 4 °C |
| Human Transferrin | DW | 50 mg/mL | 100 mg in 2 mL | -20 °C |
| Recombinant Human Wnt-3a | 1% BSA/PBS | 600 µg/mL | 500 µg in 833 µL | -80 °C |
| Y-27632 dihydrochloride | PBS | 10 mM = 3.2 mg/mL | 1 mg in 313 µL | 4 °C |
| CHIR 99021 | DMSO | 20 mM = 9.3 mg/mL | 10 mg in 1.08 mL | -20 °C |
2. Thaw Cultrex UltiMatrix RGF Basement Membrane Extract on ice for four hours or overnight at 2 - 8 °C (on ice in the refrigerator).
3. Prepare Gastric Organoid Culture Medium as indicated in TABLE 3. NOTE: The recipe below is for 50 mL, but it may be scaled as desired.
4. Sterile filter the media.
TABLE 3. Preparation of Gastric Organoid Culture Medium
Reagent Name |
[STOCK] |
[FINAL] |
Volume |
| Advanced DMEM/F12 Cell Culture Medium | NA | NA | 46.6 mL |
| Recombinant Human Wnt-3a | 600 µg/mL | 60 ng/mL | 5 µL |
| N21-MAX Supplement | 50X | 1X | 1 mL |
| GlutaminePlus | 200 mM | 2 mM | 500 µL |
| HEPES | 1 M | 10 mM | 500 µL |
| Penicillin-Streptomycin | 100X | 1X | 500 µL |
| N-2 MAX Supplement | 100X | 1X | 500 µL |
| A 83-01 (ALK5 inhibitor) | 25 mM | 2 µM | 4 µL |
| N-Acetylcysteine | 500 mM | 1 mM | 100 µL |
| Recombinant Human FGF-10 | 100 µg/mL | 200 ng/mL | 100 µL |
| Recombinant Human R-Spondin 1 | 1 mg/mL | 1 µg/mL | 50 µL |
| Recombinant Human Noggin | 100 µg/mL | 100 ng/mL | 50 µL |
| Human Insulin | 10 mg/mL | 7.5 µg/mL | 37.5 µL |
| SB 202190 (p38 MAPK inhibitor) | 30 mM | 10 µM | 16.7 µL |
| Human Transferrin | 50 mg/mL | 10 µg/mL | 10 µL |
| Gastrin I Human | 100 µM | 1 nM | 0.5 µL |
| Recombinant Human EGF | 500 µg/mL | 50 ng/mL | 5 µL |
Total |
50 mL |
Methods for Culturing Human Gastric Organoids
1. Starting Organoids from a Cryovial
a. Thaw the cryovial containing organoids in a 37 °C water bath. NOTE: The contents should thaw in 2–3 minutes; do not allow the cryovial to remain at 37 °C any longer than is necessary.
b. Transfer the contents of the cryovial to a 15 mL conical tube and add 9 mL of Advanced DMEM/F12 cell culture medium. Gently pipet up and down three times using a serological pipette to resuspend the organoids. NOTE: Organoids may be counted at this time if needed to determine seeding volumes.
c. Centrifuge the vial at 500 × g for 3 minutes to pellet the gastric organoids, and aspirate the medium.
d. Resuspend the gastric organoids in Cultrex UltiMatrix RGF Basement Membrane Extract, at 10,000 organoids per mL (500 organoids per well). Pipet up and down three times using a serological pipette to disperse the organoids in the Cultrex UltiMatrix RGF Basement Membrane Extract and dispense 50 μL of the Cultrex UltiMatrix RGF Basement Membrane Extract/organoid mixture in the center of each well of a 24-well plate (FIGURE 1) or follow the guidelines in TABLE 4 below for other plate formats. NOTE: The Cultrex UltiMatrix RGF BME-contained organoids should not touch the sides of the well.
TABLE 4. BME and Media Volumes Used in Different Multiwell Formats
Plate Format |
Volume of Basement Membrane Matrix/Well |
Domes/Well |
Volume of Culture Medium/Well |
| 6-well plate | 200 µL | 10-15 | 2 mL |
| 12-well plate | 100 µL | 5-7 | 1 mL |
| 24-well plate | 50 µL | 1-3 | 500 µL |
| 48-well plate | 25 µL | 1 | 250 µL |
| 96-well plate | 5 µL | 1 | 100 µL |
FIGURE 1. Placement of Cultrex UltiMatrix RGF BME/Organoid Mixture in a 24-well or 6-well Plate. (A) Placement of Cultrex UltiMatrix RGF BME/organoid mixture in the center of a well in a 24-well plate or (B) placement of multiple domes within a well of a 6-well plate.
Record Keeping and Calculations for Preparing Gastric Organoid Starting/Growth Medium:
e. Record the total volume of Cultrex UltiMatrix RGF Basement Membrane Extract.
f. Record the number of wells seeded.
g. Incubate the plate in the cell culture incubator for 25 minutes to polymerize the Cultrex UltiMatrix RGF Basement Membrane Extract.
h. Calculate the volume of Gastric Organoid Starting/Passaging Medium needed. In the protocol outlined here, each well of a 24-well plate contained 50 μL of Cultrex UltiMatrix RGF Basement Membrane Extract, so 500 μL of Gastric Organoid Starting/Passaging Medium is needed per well, or a total volume of 12 mL of Organoid Starting/Passaging Medium. Follow the guidelines in TABLE 4 for other plate formats.
i. Prepare Gastric Organoid Starting/Passaging Medium as indicated in TABLE 5 below. Calculate and record the amount added for each reagent.
j. Add 500 μL of Gastric Organoid Starting/Passaging Medium per well. NOTE: Medium should be gently pipetted into the corner of the well away from the Cultrex UltiMatrix RGF BME/organoids to prevent their disruption.
k. Return the plate containing organoid cultures to the cell culture incubator to promote organoid growth.
TABLE 5. Preparation of Gastric Organoid Starting/Passaging Medium
Reagent Name |
[STOCK] |
[FINAL] |
Calculation |
Amount Added |
| Gastric Organoid Culture Medium | NA | NA | Total Volume | |
| Nicotinamide | 1 M | 10 mM | Total Volume / 100 | |
| Y-27632 dihydrochloride | 10 mM | 10 µM | Total Volume / 1,000 | |
| CHIR 99021 | 20 mM | 2.5 µM | Total Volume / 8,000 |
2. Gastric Organoid Culture Maintenance
The culture medium should be aspirated from each well and replaced with fresh Gastric Organoid Culture Medium every other day (i.e., Monday, Wednesday, and Friday; see TABLE 6). Gastric organoids can be cultured for two weeks before passaging, depending on cell seeding density. NOTE: Medium should be gently aspirated from and pipetted into the corner of the well away from the Cultrex UltiMatrix RGF BME/organoids to prevent their disruption.
TABLE 6. Medium Change Dates
|
|
Change 1 |
Change 2 |
Change 3 |
Change 4 |
Change 5 |
Record Date |
3. Passaging or Cryobanking Organoids
a. View gastric organoids under the microscope. Each well should contain approximately 500 organoids for optimal growth. Organoid cultures exhibiting rapid growth may be split 1:4 during passaging, while slow growing cultures may benefit from a 1:1 split. Make this determination prior to harvesting to estimate reagent needs prior to starting. NOTE: Organoid density is important for optimal growth; too many organoids will strain culture resources, while too few organoids lack paracrine signaling necessary to sustain growth.
b. Aspirate the medium without disturbing the organoids at the bottom of the wells.
c. Wash each well with 10 volumes of cold (4 °C) PBS, and aspirate without disturbing the Cultrex UltiMatrix RGF Basement Membrane Extract dome (e.g. if the well has 1x 50 μL dome, 500 μL of wash solution must be used).
d. Add 10 volumes of cold (4 °C) Cultrex Organoid Harvesting Solution to each well to depolymerize the Cultrex UltiMatrix RGF Basement Membrane Extract. In the protocol outlined here, each well contained 50 μL of Cultrex UltiMatrix RGF Basement Membrane Extract, so 500 μL of Organoid Harvesting Solution is needed per well in the plate. Domes can be scraped and gently triturated to aid the dissociation. They can also be left in the plate or transferred to a centrifuge conical tube.
e. Organoids should be incubated on ice with gentle shaking (<100 rpm) until the organoids are visually released from the matrix and the matrix is completely dissolved, anywhere from 30 minutes to 90 minutes, check every 10 minutes after the first 30 minutes. Apoptosis inhibitors like Y compound (5-10 μM final concentration for 3-4 days) may be used to avoid stress due to cold temperatures. NOTE: For this incubation, tubes or plates can be placed inside of small Styrofoam boxes or ice buckets with the lids closed on top and then placed in an orbital shaker.
f. Pipet up and down three times with a serological pipette across the well to solubilize any remaining gel.
g. After the organoids are completely released, an optional step may be performed: if expansion is desired, pass the organoid solution through a 20-gauge needle into a conical tube to fragment the organoids.
h. Centrifuge the tube at 500 × g at 4 °C for 5 minutes.
i. Aspirate the supernatant but be careful not to disturb the organoid pellet.
j. Resuspend the pellet in 10 volumes of cold (4 °C) PBS or cold base media (without any growth factors, to avoid waste) as a wash.
k. Centrifuge the tube at 500 × g at 4 °C for 5 minutes.
l. Aspirate the supernatant, but be careful not to disturb the organoid pellet and then continue with the desired application (passage, fixation, etc).
For Passaging Organoids
m. Resuspend the segmented organoids in Cultrex UltiMatrix RGF Basement Membrane Extract and dispense 50 μL of the Cultrex UltiMatrix RGF Basement Membrane Extract/organoid mixture into the center of each well of a 24-well plate to form a dome or follow the guidelines outlined in TABLE 4 for other plate formats. NOTE: The Cultrex UltiMatrix RGF Basement Membrane Extract-contained organoids should not touch the sides of the wells.
n. Incubate the plate in the cell culture incubator for 25 minutes to polymerize the Cultrex UltiMatrix RGF Basement Membrane Extract.
o. Add 500 μL of Gastric Organoid Starting/Passaging Medium per well if using a 24-well plate or follow the guidelines outlined in TABLE 4 for other plate formats. NOTE: Medium should be gently pipetted into the corner of the well away from the Cultrex UltiMatrix RGF Basement Membrane Extract to prevent its disruption.
p. Return the plate containing the organoid cultures to the cell culture incubator to promote organoid growth.
For Cryobanking Organoids
q. Passage the organoids 2-3 days before cryopreservation.
r. Resuspend the segmented organoids in 90% FBS, 10% DMSO, and 10 μM Y-27632 dihydrochloride, and dispense 500 μL of the organoid mixture into each labeled cryovial.
s. Place the cryovials in a freezing container, and store at < -80 °C for 24 hours.
t. Transfer the cryovials to a liquid nitrogen tank for long-term storage.
FIGURE 2. Undifferentiated Human Gastric Organoids. Representative brightfield images of human gastric organoids that were cultured using Cultrex UltiMatrix RGF Basement Membrane Extract (R&D Systems, Catalog # BME001-05) and the other Bio-Techne reagents listed in this protocol.
FIGURE 3. Immunohistochemistry of Undifferentiated Human Gastric Organoids. Human gastric organoids were cultured using Cultrex UltiMatrix RGF Basement Membrane Extract (R&D Systems, Catalog # BME001-05) and the other Bio-Techne reagents listed in this protocol. Undifferentiated gastric organoids were stained using a Goat Anti-Human/Mouse E-Cadherin Affinity-purified Polyclonal Antibody (R&D Systems, Catalog # AF748; green) and a Mouse Anti-Human HOXB7 Monoclonal Antibody (R&D Systems, Catalog # MAB8040; red) and counterstained with DAPI (Tocris, Catalog # 5748; blue).
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Bartfeld, S. et al. (2015) In vitro expansion of human gastric epithelial stem cells and their responses to bacterial infection. Gastroenterology 148:126. PMID: 25307862.