We recommend that no antibiotics are present during transfection. The process of transfection can make the cells somewhat more porous to allow for efficient DNA entry. During this time, antibiotics will also enter the cells more easily and the cells may show increased cell death. Wait until about 24 hours after transfection to resume the use of preventative antibiotics and/or start the use of selective antibiotics.
L3287
Escort™ IV Transfection Reagent
Lipid reagent for transient and stable transfection of mammalian and insect cells.
Synonym(s):
Gene delivery
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About This Item
NACRES:
NA.25
UNSPSC Code:
41106502
Form:
liquid (aqueous solution)
Grade:
Molecular Biology
Technique(s):
transfection: suitable
Concentration:
1 mg/mL
Pricing and availability is not currently available.
grade
Molecular Biology
Quality Segment
form
liquid (aqueous solution)
usage
mL sufficient for 160-500 transfections
concentration
1 mg/mL
technique(s)
transfection: suitable
storage temp.
2-8°C
General description
Escort™ IV is a unique formulation of a proprietary polycationic lipid and a neutral non-transfecting lipid. This liposome-forming compound is used for transfection of nucleic acids into a wide variety of eukaryotic cell types.
Application
Suitable for transient and stable transfection of nucleic acids into cultured eukaryotic cells. Use approximately 4-16 μL Escort™ IV and 2 μg DNA per 6 cm cell culture plate. Protocol optimization provides very efficient transfection. For a list of cells that have been successfully transfected using Escort™ IV, see the Transfection Reagent Selection Guide.
Biochem/physiol Actions
A stable complex is formed when Escort™ IV is mixed with DNA in the absence of serum. The complexes are stable and can be directly added to the cell culture medium, where they fuse with the cell membrane, releasing the DNA into the cytoplasm. Note: complex formation is inhibited by serum, but once stable complexes have formed, the presence of serum is without consequence.
Features and Benefits
- Suitable for stable and transient transfection
- Optimized for a wide variety of cell lines
- Low toxicity
- Compatible with both serum and serum-free transfection protocols
- Ideal for Sf9, Sf21 and S2 insect cells
Other Notes
Escort™ IV formulation:
1 mg/mL total lipid in water
Note the identity of the lipids used in Escort™ IV is confidential.
1 mg/mL total lipid in water
Note the identity of the lipids used in Escort™ IV is confidential.
Legal Information
Escort is a trademark of Sigma-Aldrich Co. LLC
Disclaimer
Do not freeze.
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This Item | |||
|---|---|---|---|
| technique(s) transfection: suitable | technique(s) transfection: suitable | technique(s) transfection: suitable | technique(s) transfection: suitable |
| form liquid (aqueous solution) | form liquid (aqueous solution) | form liquid | form liquid (aqueous solution) |
| grade Molecular Biology | grade Molecular Biology | grade - | grade Molecular Biology |
| Quality Level 100 | Quality Level 200 | Quality Level 200 | Quality Level - |
| concentration 1 mg/mL | concentration 1 mg/mL | concentration - | concentration - |
| storage temp. 2-8°C | storage temp. 2-8°C | storage temp. 2-8°C | storage temp. −20°C |
Storage Class
10 - Combustible liquids
wgk
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Gloves
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Can antibiotics be present in the medium during transfection?
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Why do I see a precipitate in my cell culture after lipid-based transfection?
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The precipitate is likely excess lipid or EDTA and will probablly not affect transfection efficiency. If your DNA plasmid is suspended in TE, be sure the concentration of EDTA is <0.3 mM, or suspend the DNA in sterile molecular biology grade water instead.
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What is the difference between stable and transient transfection?
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When the DNA enters the nucleus of the cell, the plasmid is replicated by the cell machinery (transient transfection). During this time, RNA is transcribed and protein translated until the plasmid DNA is lost after a few cell divisions. This expression of the plasmid DNA, mRNA, and protein is transient (temporary).In some cases, the plasmid DNA is integrated into the host cell genome. This is usually accompanied by forced expression using a selection antibiotic and sometimes a cloning step (to be sure all cells have the same integration site). Once the DNA is stable, the cell line can be frozen and used to express protein for many years. Clones may even be screened for those expressing the highest amount of protein.
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What is transfection efficiency?
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Transfection efficiency is a measure of how many cells take up the DNA during the transfection process. Many transfection reagents can achieve a transfection efficiency of >90% in common cell lines. Other cell lines are hard to transfect, and require special reagents and/or techniques to achieve even a small population of transfected cells.
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What quality does the DNA need to be in order to use it for transfection?
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The DNA needs to be good quality or it may cause the cells to lyse and/or they won't transfect efficiently. Plasmid DNA prepared with a column-based DNA purification kit is suitable for transfections. Sigma's GenElute™ Minprep, Midiprep and Maxiprep kits work well for DNA plasmid purification. After preparing the DNA, confirm the OD A260:A280 ratio is greater than 1.6 for use in plasmid transfections.
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Is low cell passage number an important consideration for transfection?
1 answer-
Yes, we recommend cells are at a low passage when being used for any application, including transfection. The reason why depends on what type of cells they are. Primary cells will undergo a finite number of divisions, and as they get closer to senesence they divide more slowly - both affecting their ability to take up DNA (transient transfection), and minimizing their abillity to incorporate the DNA into the genome (stable selection).Cultured common cell lines are often immortalized, and generally continue to aquire mutations, leading to a heterogenous population that may perform differently from cells of lower passage number - leading to results that are not reproducible.
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What are the differences between the two Escort™ products?
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Each Escort™ transfection Reagent is a different lipid formulation. These different formulations are more readily taken up by different cells, presumably by endocytosis.Escort™ III is a unique formulation of a proprietary polycationic lipid and a neutral, non-transfecting lipid.Escort™ IV is a a confidential lipid.
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Is the size of the plasmid an important consideration for transfection?
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The size of the plasmid should be considered when selecting a transfection reagent with the best efficiency. In general, larger sized plasmids should easily transfect with readily available transfection reagents, as along as the plasmid DNA is of high purity.
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Is optimizing the transfection protocol important?
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For many common cell lines, transfection reagent efficiency is very high and the protocols will not require any optimization. For hard-to-transfect cells or those ultimately expressing a toxic protein, the protocol should be optimized for best transfection efficiency. Taking time to optimize will give you more transfected cells with each procedure, which can mean more protein expressed and results that are reproducible.
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What is the Department of Transportation shipping information for this product?
1 answer-
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
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