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What stock concentration of Propidium Iodide does Lonza use for FACS analysis?

We use a stock concentration of 100 µg/ml in PBS. This is diluted 1:300 – 1:400 into the sample.

Is it possible to use frozen primary CD34+ hematopoietic stem cells for Nucleofection™?

Yes. For cryopreserved PBMCs or enriched CD34 populations, we recommend culturing the thawed cells 1-2 hours in culture medium before Nucleofection™. Any further enrichment procedure after thawing is not recommended. Viability of frozen nucleofected...

What are the critical steps for successful Nucleofection™ of monocytic cell lines like THP-1, HL60 and U937?

To achieve optimal results, we strongly recommend following the Optimized Protocols in regard to cell culture conditions (medium, splitting cycle, density before Nucleofection),DNA amount and purity. Please also be sure not to exceed 90xg when...

Do you recommend a particular supplier for siRNA duplexes for use in Nucleofection™ ?

For siRNA applications using the Nucleofector technology we recommend siRNA duplexes from Dharmacon, part of Thermo Fischer Scientific.

Can I use the protocol for MCF7 cells for other breast cancer cell lines?

No. Often times closely related cell types will require completely different conditions for Nucleofection™. Therefore, you may want to consider performing a full optimization by using the Cell Line Optimization Kit. Please click on the related link...

When nucleofecting cancer cell lines, do I need to be concerned about passage number?

For the most efficient gene transfer, we recommend using cells that are in logarithmic growth phase and at a passage number of 10-15 (from the time of thaw). This is because some cell lines differentiate and change their features after many...

Do you have any siRNA Nucleofection™ results using concentrations lower than 50nM?

Yes. Please click on the attached Technical Reference Guide: "Designing an RNAi Experiment Using Nucleofection™". On page 3 you can find a table with some examples.

The animal facility which isolates my hepatocytes is at a different location, should I be concerned about transport time?

Isolated hepatocytes can be transported in Krebs-Henseleit Buffer or supplemented William's E Medium. Long transport time for isolated hepatocytes, (in excess of one hour) can cause a decrease in efficiency of Nucleofection™, but does not seem to...

How much DNA can I use when transfecting hepatocytes with the standard Nucleofector™?

We have used up to 6 µg of DNA per 100 µl reaction with no deleterious effect.

For hepatocytes, is plating density a concern post Nucleofection™?

Yes, the optimized protocols for the standard Nucleofector™ recommend the use of 6 well plates. Plating into a 12-well plate will pose a problem as less cells will attach at high densities.

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