5-Vinyl-uridine

Operating Instructions (The following is a recommended experimental protocol for reference only; adjustments are required based on actual needs)
1. Stock Solution Preparation
1.1 Solvent: DMSO.
1.2 Recommended concentration: 100 mM.
2. Working Solution Preparation
2.1 Diluent: Complete DMEM medium (containing 4.5 g/L glucose, 10% FBS, 100 units/mL penicillin, 100 μg/mL Streptomycin (HY-B1906) and 1% HEPES (HY-D0857)).
2.2 Working concentrations: 50 μM, 200 μM, 1 mM.
2.3 Notes: Adjust the working solution concentration according to requirements; prepare and use immediately.
3. Staining Procedure
3.1 Sample Types^[1]:
3.1.1 Adherent cells (HeLa cells): Trypsin digestion is not required for fixation-based staining.
3.1.2 In vivo samples: BALB/c nude mice subcutaneously inoculated with LS-180 tumors.
3.2 Incubation Conditions:
3.2.1 In vitro cells: Incubate at 37°C for 10 min, 30 min, 1 h, 3 h, 6 h, 20 h or 24 h as needed; then incubate with 300 μM Biotin (HY-B0511)-tetrazine at 37°C overnight, followed by incubation with Streptavidin (HY-P3152)-Alexa Fluor 488 at room temperature for 30 min; or incubate with 200 μM BODIPY-tetrazine at 37°C overnight.
3.3 Washing Steps:
3.3.1 In vitro cells: Wash twice with PBS after incubation with Biotin-tetrazine; wash twice with PBS after incubation with Streptavidin-Alexa Fluor 488.
3.3.2 Fixed in vitro cells: Wash with PBS after incubation with 5-Vinyluridine (HY-W416298) and before formaldehyde fixation.
4. Control Setup
4.1 Negative control: Cells not incubated with 5-Vinyluridine.
4.2 Inhibition control: Treat cells with Actinomycin D (HY-17559) or RNase A (RNase A, Bovine pancreas) (HY-129046) to confirm RNA-specific labeling.
4.3 Positive controls are used to validate the experimental system; blank controls are used to eliminate reagent fluorescence interference.
5. Detection and Analysis
5.1 Instruments:
5.1.1 Fluorescence microscope or confocal microscope; excitation/emission parameters for Alexa Fluor 488: 488 nm excitation; excitation/emission parameters for BODIPY-tetrazine: 450−490 nm excitation / 500−550 nm emission; flow cytometer equipped with a 488 nm laser; in vivo imaging system with excitation wavelength of 450−490 nm and emission wavelength of 500−550 nm.
5.2 Result Analysis:
5.2.1 Fluorescence intensity increases with prolonged incubation time and elevated concentration of 5-Vinyluridine; fluorescence intensity decreases after treatment with RNase A or high-concentration Actinomycin D.
5.2.2 Fluorescence localization: RNA labeled with 5-Vinyluridine shows green fluorescence in the nucleus and cytoplasm (stronger fluorescence in interphase, weaker nuclear fluorescence in mitosis).
5.2.3 Color change: Alexa Fluor 488 or BODIPY-tetrazine produces green fluorescence.

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.