JoVE Encyclopedia of Experiments
Kankeronderzoek
0 weergaven • 3:53 min • April 30th, 2023
- 3D organotypic models of colorectal cancer are in-vitro cultures engineered to mimic in-vivo tumor microenvironments. The culture often contains stromal cells, like fibroblasts, co-cultured with colorectal cancer epithelial cells, in a suitable extracellular matrix microenvironment.
In established cultures, tumor cells with metastatic potential invade the extracellular matrix. To isolate these invading cells, first, treat the organotypic model with formaldehyde to fix cells and extracellular matrix. Incubate with alcohol to dehydrate the sample.
Next, embed in liquid paraffin wax to generate a tissue block. Use an ultramicrotome to obtain thinly sliced sections. Mount the sections onto an appropriate glass slide.
Add Xylene to deparaffinize the sections. Sequentially, incubate the sections in decreasing concentrations of ethanol to rehydrate samples.
Treat with Cresyl Violet to stain and differentiate colorectal cancer cells from the microenvironment. Place the stained glass slide face down on the microscope stage. Using appropriate software, identify the cells to be microdissected and delineate the borders. Fire the laser to cut the highlighted section and collect the microdissected portion.
In the following protocol, we will show the isolation of colorectal cancer cells from a 3D organotypic co-culture model by laser microdissection.
- Remove the whole organotypic, including nylon sheet, from the well and place it on cling film. Bisect the organotypic and nylon sheet using a clean disposable scalpel and fix both halves in formaldehyde for 24 hours at room temperature. Replace formaldehyde with 70% ethanol after 24 hours and leave overnight prior to embedding in paraffin, sectioning, and staining.
To perform laser microdissection, first, section the organotypic to 10-micron thickness onto membrane-mounted slides. After treating the sections as described in the text protocol, prepare to conduct laser microdissection using the chosen platform.
Place the glass slide with the stained section to be microdissected face down on the microscope stage. Mount a 0.5 milliliter microcentrifuge tube into the collection cassette and add 50 microliters of cell lysis buffer to the cap into which microdissected tissue will collect. Under direct vision, use the joystick to identify the tissue of interest, and using the software interface, annotate the stained organic section, highlighting cells to be microdissected at the tumor invasion front.
Instruct the laser to fire, which should both cut out the highlighted section and propel the microdissected tissue into the cap of the microcentrifuge tube. Proceed to process samples by an appropriate method to extract the analyte of interest.
Dit artikel presenteert een gedetailleerd protocol voor het isoleren van colorectale kankercellen uit een 3D organotypisch co-culturemodel met behulp van laser-microdissectie. De methode is erop gericht de tumoromgeving na te bootsen en de bestudering van het gedrag van kankercellen te faciliteren.
Laser-microdissectie van 3D organotypische colorectale kankermodellen maakt de precieze isolatie van invaderende tumorcellen binnen een fysiologisch relevante micro-omgeving mogelijk. Deze mogelijkheid ondersteunt de mechanistische risicoreductie en doelwitvalidatie bij het invasiefront, een kritiek omslagpunt voor oncologieportfolio's. Deze aanpak vergroot het voorspellende vertrouwen voor downstream moleculaire profilering en translationeel onderzoek.
Deze methode bevindt zich op het snijvlak van vroege ontdekking en preklinisch onderzoek en slaat een brug tussen targetvalidatie en de ontwikkeling van translationele biomarkers in oncologische pijplijnen.
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Laatst bijgewerkt: 22 augustus 2026