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General description
http://www.nature.com/app_notes/nmeth/2012/121007/pdf/an8620.pdf
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Biosensors can be used to detect the presence/absence of a particular protein as well as the subcellular location of that protein within the live state of a cell. Fluorescent tags are often desired as a means to visualize the protein of interest within a cell by either fluorescent microscopy or time-lapse video capture. Visualizing live cells without disruption allows researchers to observe cellular conditions in real time.
Lentiviral vector systems are a popular research tool used to introduce gene products into cells. Lentiviral transfection has advantages over non-viral methods such as chemical-based transfection including higher-efficiency transfection of dividing and non-dividing cells, long-term stable expression of the transgene, and low immunogenicity.
EMD Millipore is introducing LentiBrite Lentiviral Biosensors, a new suite of pre-packaged lentiviral particles encoding important and foundational proteins of autophagy, apoptosis, and cell structure for visualization under different cell/disease states in live cell and in vitro analysis.
- Pre-packaged, fluorescently-tagged with GFP & RFP
- Higher efficiency transfection as compared to traditional chemical-based and other non-viral-based transfection methods
- Ability to transfect dividing, non-dividing, and difficult-to-transfect cell types, such as primary cells or stem cells
- Non-disruptive towards cellular function
EMD Millipore’s LentiBrite RFP-β-actin lentiviral particles provide bright fluorescence and precise localization to enable live cell analysis of actin microfilament dynamics in difficult-to-transfect cell types.
EMD Millipore’s LentiBrite RFP-β-actin lentiviral particles provide bright fluorescence and precise localization to enable live cell analysis of actin microfilament dynamics in difficult-to-transfect cell types.
Application
Similar to Figure 1 in the datasheet, HeLa cells were plated in a chamber slide and transduced with lentiviral particles at an MOI of 20 for 24 hours. After media replacement and 48 hours further incubation, cells were either untreated, incubated for 2 hours in complete media containing 2 µM cytochalasin-D, or incubated for 2 hours in complete media containing 200nM jasplakinolide to induce actin depolymerization. Immunocytochemical staining (green) of the same fields of view with FIITC-conjugated Phalloidin reveals similar expression patterns to the RFP-protein (red).
Hard-to-transfect Cell Types:
Primary cell types HUVEC or HuMSC were plated in chamber slides and transduced with lentiviral particles at an MOI of 40 for 24 hours.
Confocal Microscopy Imaging: HeLa and HT-1080 cells were treated as in Figures 2A and 2B in the datasheet. Images were obtained by oil immersion confocal fluorescence microscopy.
For optimal fluorescent visualization, it is recommended to analyze the target expression level within 24-48 hrs after transfection/infection for optimal live cell analysis, as fluorescent intensity may dim over time, especially in difficult-to-transfect cell lines. Infected cells may be frozen down after successful transfection/infection and thawed in culture to retain positive fluorescent expression beyond 24-48 hrs. Length and intensity of fluorescent expression varies between cell lines. Higher MOIs may be required for difficult-to-transfect cell lines.
Components
One vial containing 25 µL of lentiviral particles at a minimum of 3 x 10E8 infectious units (IFU) per mL. For lot-specific titer information, please see “Viral Titer” in the product specifications above.
Promoter
EF-1 (Elongation Factor-1)
Multiplicty of Infection (MOI)
MOI = Ratio of # of infectious lentiviral particles (IFU) to # of cells being infected.
Typical MOI values for high transduction efficiency and signal intensity are in the range of 20-40. For this target, some cell types may require lower MOIs (e.g., HT-1080, U2OS), while others may require higher MOIs (e.g., human umbilical vein endothelial cells (HUVEC), human mesenchymal stem cells (HuMSC), HeLa).
NOTE: MOI should be titrated and optimized by the end user for each cell type and lentiviral target to achieve desired transduction efficiency and signal intensity.
Quality
Legal Information
Storage Class
10 - Combustible liquids
wgk_germany
WGK 2
Certificates of Analysis (COA)
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Articles
High titer lentiviral particles including beta-actin, alpha-tubulin and vimentin used for live cell analysis of cytoskeleton structure proteins.
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