This study investigates the effects of photodynamic treatment (PDT) on macrophages using a photosensitizer. The experiment assesses cellular uptake, metabolic activity, and the role of reactive oxygen species (ROS) in cellular toxicity.
Take a multi-well plate containing adherent macrophages.
Add serially diluted test photosensitizer to test wells. The control well lacks the photosensitizer.
Incubate for cellular uptake of the photosensitizer.
Expose the plate to UV light, termed photodynamic treatment, or PDT, for a specified duration.
In the test wells, photosensitizers within the macrophages absorb UV light and become excited.
These excited photosensitizers react with molecular oxygen, forming reactive oxygen species, or ROS, and causing cellular toxicity.
To counteract this, cellular antioxidant enzymes, including superoxide dismutase and catalase, neutralize ROS, preventing cellular oxidative damage.
Add XTT reagent, a tetrazolium salt, and an electron-coupling reagent to both test and control wells. Incubate.
In metabolically active cells, the trans-plasma membrane electron transport system transfers electrons from mitochondrial NADH to the electron-coupling reagent, reducing XTT to an orange formazan product.
Comparable formazan absorbance in test and control wells indicates that PDT exposure with photosensitizer treatment does not impact macrophage metabolic activity.
Begin with a culture of the murine macrophage cell line, grown in complete RPMI 1640 medium, in a sterile 96-well flat-bottom microtiter plate, as described in the text protocol.
Additionally, prepare a stock solution of the photosensitizer by dissolving the powder in distilled water. Prepare serial dilutions of the photosensitizer solution using RPMI 1640 medium.
Now, add 100 microliters of the photosensitizer solution to appropriate wells of the microtiter plate seeded with macrophages. Incubate the culture under ambient light and temperature.
To test the effect of UV light, expose the photosensitizer-treated macrophage culture to the UV light.
To assess the metabolic activity of the treated macrophages, add 50 microliters of XTT reagent to all the wells containing the irradiated cells.
Add four microliters of menadione to improve the reduction of the XTT salt. Incubate the plates for 3 hours at 37 degrees Celsius with 5 percent carbon dioxide.
After incubation, measure the product formation by reading the absorbance at 492 nanometers.
繁體中文
