Description
Preparation Bring FVS620 dye powder and 230 μl of fresh cell culture-grade Dimethyl Sulfoxide (DMSO; eg, Sigma D2650) to room temperature. Add 230 μl of DMSO and vortex solution well. Inspect the solution and repeat vortex until the stock dye has fully dissolved. This is the Stock Solution. Storage Upon arrival, store the dry dye desiccated and protected from light at -80°C until use. After reconstitution with DMSO, store the Stock Solution at -20°C in small aliquots. Do not use reconstituted dye after 90 days of storage. Please discard the dye solution after 90 days post reconstitution with DMSO. Cytometry Requirements Yellow-Green or Blue laser-equipped Flow Cytometers (eg, BD FACSCanto™ II, BD LSRFortessa™, BD LSR™ II, or BD Accuri™ C6) can be used. This dye can be read out of filters commonly used for BD Horizon™ PE-CF594 (eg, 610/20-nm filter) or PerCP-Cy™5.5 (eg, 695/40-nm filter). Fluorescence compensation is best achieved using stained and unstained samples of the cells of interest. Procedure Fixable Viability Stain 620 labeling of cells 1. Prepare cells for flow flow cytometric staining using sodium azide-free buffers. 2. Wash cells one time in sodium azide- and protein-free Dulbecco's Phosphate Buffered Saline (1X DPBS). 3. Resuspend cells at 1-10 x 10^6 cells/ml in sodium azide- and protein-free 1X DPBS. 4. Add 1 μl of BD Horizon™ Fixable Viability Stain 620 Stock Solution for each 1 ml of cell suspension (1:1000) and vortex immediately. a. Note: We recommend titrating the dye for optimal performance, as different cell types and different applications can result in a wide degree of variability in staining. 5. Incubate the mixture for 10-15 minutes at room temperature protected from light. a. Optional: Alternatively, incubate mixtures at 37°C for 5-7 minutes or 2-8°C for 30-60 minutes. 6. Wash cells twice with 2 ml of BD Pharmingen™ Stain Buffer (FBS) (Cat. No. 554656) or the equivalent. 7. Decant the supernatant and gently mix to disrupt the cell pellet. 8. Resuspend the cells in Stain Buffer (FBS) or equivalent. 9. Stain, fix and permeabilize cells as desired for downstream applications. Notes: 1. Each user should determine the optimal concentrations of reagents, cells, and conditions for the assay of interest. We recommend titrating the reagent in early experiments to obtain optimal results. 2. The reactivity of the free dye is quenched by washing with buffer containing protein (eg, FBS or BSA). 3. Cells may be stained in bulk prior to freezing or staining with fluorescent antibodies. 4. BD Horizon™ Fixable Viability Stain 620 can be used in intracellular staining assays that require fixation with formaldehyde and permeabilization with methanol and detergents such as those used for BD Phosflow™ staining (eg, BD Phosflow™ Perm Buffer III, Cat. No. 558050), intracellular cytokine staining (eg, BD Cytofix/Cytoperm™ Fixation/Permeabilization Solution Kit, Cat. No. 554714), or transcription factor staining (eg, BD Pharmingen™ Transcription Factor Buffer Set, Cat. No. 562574/562725). 5. Apoptotic cells can show variable staining. We recommend co-staining with other fluorescent probes such as APC Annexin V (Cat. No. 550475) if further analysis is desired for the apoptotic cells.
1. Since applications vary, each investigator should titrate the reagent to obtain optimal results.
2. For fluorochrome spectra and suitable instrument settings, please refer to our Multicolor Flow Cytometry web page at www.bdbiosciences.com/colors.
3. CF™ is a trademark of Biotium, Inc.
4. Cy is a trademark of GE Healthcare.
5. Before staining with this reagent, please confirm that your flow cytometer is capable of exciting the fluorochrome and discriminating the resulting fluorescence.
6. Please refer to www.bdbiosciences.com/us/s/resources for technical protocols.
