Title |
General Spinfection Protocol |
Date Submitted |
March 29, 2012 |
Submitted by |
Berggren, Travis, tberggren@salk.edu |
Adapted from |
Salk STEM Cell Core in-house protocols |
Contributors |
Lutz, Margaret, Modesto, Veronica |
Affiliation |
The Salk Institute |
This protocol was developed in the Salk STEM Cell Core to enable researchers to consistently and reproducibly produce reprogrammed cells. It assumes that the four factor retrovirus being used has a high titer and that the BJ Fibroblasts being used are growing robustly. After transduction, colonies should start to appear within 3 to 5 weeks.
Prepare Plate For Spinfection:
Perform Spinfection:
Product | Amount Needed | Supplier | Catalogue number |
---|---|---|---|
Allegra X-15R Centrifuge or equivalent with plate adapter |
1 | Beckman Coulter | BK392932 |
4 factor retrovirus | ≥4 mls | Made in-house | |
6 well TC treated plate | 1 | USA Scientific | CC7682-7506 |
10 cm TC treated dish | 1 | USA Scientific | CC7682-3394 |
Serological Pipets | Numerous | Corning | |
Polybrene | 2-4 µl of 8 mg/ml stock | Millipore | TR-1003-G |
BJ Fibroblasts | 1 well of a 6 well | ATCC | CRL-2522 |
Mitotically-inactivated MEFs | 1x10cm dish plated with 1.2 million MEFs |
Global Stem | GSC-6001G |
Fibroblast Media | See below | ||
WiCell hES Media | See below | ||
mTeSR1 (optional) | Stemcell Technologies | 05850 |
Fibroblast Media
Ingredient | Amount (mls) | Supplier | Catalog Number |
---|---|---|---|
DMEM | 90 | Life Technologies | 11965-118 |
FBS | 10 | Gemini or Various Sources | 100-106 |
NEAA | 1 | Life Technologies | 11140050 |
WiCell hES Media
Ingredient | Amount (mls) | Supplier | Catalog Number |
---|---|---|---|
DMEM/F12 | 80 | Life Technologies | 11330057 |
Knock-Out Serum Replacement |
20 | Life Technologies | 10828-028 |
Glutamax | 1 | Life Technologies | 35050061 |
NEAA | 1 | Life Technologies | 11140050 |
Beta-Mercaptoethanol 1000x |
.001 | Life Technologies | 21985-023 |
FGF2 (50µg/ml conc.) | .02 | Various sources |
*Retroviral integration is dependent on actively dividing cells. Reprogramming efficiencies also have been shown to increase with increased proliferation of the starting cell population. For these reasons it is important to start reprogramming experiments with robust and actively dividing/growing cells. For human fibroblast we typically start with 50,000-100,000 cells per well (of 6 well). We typically transduce the fibroblast a day or two after passaging when the cells are sub-confluent, but are touching or nearly touching each other, and that ample open areas between the cells are still present. An extra well can be plated and counted at the time of infection if desired.
**We have had success using WiCell hES Media or mTeSR1. WiCell hES media (made in-house) is significantly less expensive than commercially purchased mTeSR1. We have had success plating transduced fibroblast onto matrigel coated wells and feeding with WiCell media (no MEFs, no conditioned media). Then, switching to mTeSR1 once colonies start to emerge and picking colonies directly onto matrigel/mTeSR1 conditions for expansion and characterization. Alternatively (traditional approach) the transduced cells are passaged onto mitotically inactivated MEF feeder cells, and fed every day with WiCell (or similar) hES cell media. Make fresh media, store at 4 deg C. and use within 2 weeks. Make fresh media as needed.
This page was last modified on October 18, 2012