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Novel aspects of live intestinal epithelial cell function revealed using a custom time-lapse video microscopy apparatus.
Many aspects of cell physiology, including migration, membrane function, and cell division, are best understood by observing live cell dynamics over time using video microscopy. To probe these phenomena in colon epithelial cells using simple components with a limited budget, we have constructed an inexpensive (<$410) self-contained apparatus, consisting of a closed-loop, feedback-controlled system regulated by a PID (proportional-integrative-derivative) controller contained within a 0.077 m3 insulated acrylic box. Temperature, humidity, pH, and proliferative capacity of colon epithelial cells in this system mimic those in a standard tissue culture incubator for over four days. Our system offers significant advantages over existing cost-prohibitive commercially available and custom-made devices because of its very low cost, use of PID temperature control, lack of reliance on constant infusion of external humidified, heated air or carbon dioxide, ability to directly measure cell culture medium temperature, and combination of exquisite cellular detail with minimal focus drift under physiological conditions for extended periods of time. Using this apparatus, coupled with an inverted microscope equipped with phase contrast optics and a programmable digital camera, we have observed many events in colon epithelial cells not visible by static imaging, including kinetics of normal and abnormal mitoses, dynamic membrane structures, intracellular vesicle movements, and cell migration. © 2018 International Society for Advancement of Cytometry.
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