Lip2000™ Transfection Reagent
Description
Lip2000™ is a newly developed and proprietary reagent for the transfection of nucleic acids intoeukaryotic cells.
Lip2000™ has the following advantages:
The highest transfection efficiency in many cell types and formats.
DNA-Lip2000™ complexes can be directly added to cells in culture medium (with or without serum).
It is not necessary to remove DNA-Lip2000™ complexes or change medium following transfection.
The complexes can be removed after 4-6 hours by replacing with refresh medium (optional)
Contents and Storage
Lip2000™ is supplied in liquid form at a concentration of 1mg/ml. Store at 4℃. DO NOT FREEZE.
Product Qualification
Lip2000™ has been extensively tested by transfection of HEK293 cells with an EGFP reporter containing
plasmid. Lip2000™ is free of microbial contamination.
Important Guidelines
Follow these guidelines when performing transfections:
1. The ratio of DNA (in μg) : Lip2000™ (in μl) to use when preparing complexes should be 1:2 to 1:3 for
most cell lines. To transfect 0.5 -2 ×105 cells in a 24-well format, use 0.8-1 μg DNA and 2-3 μl of
Lip2000™. Optimizing transfection by varying DNA/Lip2000™ ratio is possible.
2. It is CRITICAL to transfect cells at high cell density. 90-95% confluence the time of transfection is
recommended to obtain high efficiency and expression levels and to minimize decreased cell growth
associated with high transfection activity. Lower cell densities are suitable with optimization of conditions.
Take care to maintain a standard seeding protocol between experiments because transfection efficiency is
dependent on culture confluence.
3. DO NOT add antibiotics to media during transfection as this will cause cell death.
For better results, you may choose to:
Use Opti-MEM I medium to dilute Lip2000™ prior to complexing with DNA. Other media without serum
(e.g.DMEM) may be used to dilute Lip2000™,but transfection efficiency may be compromised.
Note: Some serum-free formulations can inhibit Lip2000™ mediated transfection, for example:CD 293,
293 SFM II, and VP-SFM etc.
Transfection Procedure for 24-Well Format
For adherent cells: One day before transfection,plate cells in growth medium (without antibiotics) so that
they will be 90-95% confluent at the time of transfection (0.5 -2 ×105 cells/well for a 24-well plate).
For suspension cells: On the day of transfection just prior to preparing complexes,plate 4-8×105cells/500
μl of growth medium (without antibiotics) in a 24-well plate.
1. For each transfection sample, prepare DNA-Lip2000™ complexes as follows:
• Dilute DNA in 50 μl of Opti-MEM I Reduced Serum Medium without serum (or other medium without
serum). Mix gently.
• Mix Lip2000™ gently before use, then dilute the appropriate amount in 50 μl of Opti-MEM I Medium
(or other medium without serum). Mix gently and incubate for 5 minutes at room temperature.
Note: Combine the diluted Lip2000™ with the diluted DNA within 30 minutes. Longer incubation times
may decrease activity. If DMEM is used as a diluent for the Lip2000™, mix with the diluted DNA within
5 minutes. After the 5 minute incubation,combine the diluted DNA with the diluted Lip2000™ (total
volume is 100 μl).
•Mix gently and incubate for 20 minutes at room temperature to allow the DNALip2000™ complexes to
form. The solution may appear cloudy,but this will not inhibit the transfection.
Note:DNA-Lip2000™ complexes are stable for at least 5 hours at room temperature.
2. Add the 100 μl of DNA-Lip2000™ complexes to each well. Mix gently by rocking the plate back and
forth.
3. Incubate the cells at 37℃ in a CO2 incubator for 24-48 hours until they are ready to assay for transgene
expression. It is not necessary to remove the complexes or change the medium; however,growth medium
may be replaced after 4-6 hours without loss of transfection activity.
For stable cell lines: Passage the cells at a 1:10 or higher dilution into fresh growth medium 24 hours after
transfection. Add selective medium the following day.
For suspension cells: Add PMA and/or PHA (if desired) 4 hours after adding the DNA-Lip2000™
complexes to the cells.
Tip: For Jurkat cells, adding PHA-L and PMA at final concentrations of 1 μg/ml and 50 ng/ml,
respectively, enhances CMV promoter activity and gene expression. For K562 cells, adding PMA alone is
sufficient to enhance promoter activity.
Scaling Up or Down Transfections
To transfect cells in different tissue culture formats, vary the amounts of Lip2000™ , DNA, cells, and
medium used in proportion to the difference in surface area (see table below). With automated,
highthroughput systems, larger complexing volumes are recommended for transfections in 96-well plates.
Note: You may perform rapid 96-well plate transfections (plate cells and transfect simultaneously) byadding a suspension of cells directly to complexes prepared in the plate. Prepare complexes and add cellsat twice the cell density asCultureVesselSurface Areaper Well (cm2)Relative SurfaceArea (vs.24-well)Volume ofPlatingMediumDNA (μg) andDilution Volume(μl)
Lip2000™ (μl)
and Dilution
Volume (μl)
96-well 0.3 0.2 100 μl 0.2 μg in 25 μl 0.5 μl in 25 μl
24-well 2 1 500 μl 0.8 μg in 50 μl 2.0 μl in 50 μl
12-well 4 2 1 ml 1.6 μg in 100 μl 4.0 μl in 100 μl
35-mm 10 5 2 ml 4.0 μg in250 μl 10 μl in 250 μl
6-well 10 5 2 ml 4.0 μg in250 μl 10 μl in 250 μl
60-mm 20 10 5 ml 8.0 μg in 0.5 ml 20 μl in 0.5 ml
10-cm 60 30 15 ml 24 μg in 1.5 ml 60 μl in 1.5 ml
Note: Surface areas are determined from actual measurements of tissue culture vessels.
Optimizing Transfection
To obtain the highest transfection efficiency and low non-specific effects,optimize transfection conditions
by varying DNA and Lip2000™ concentrations, and cell number. Make sure that cells are greater than
90% confluent and vary DNA (μg) : Lip2000™ (μl) ratios from 1:0.5 to 1:5. |
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