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使用MEF来源的条件培养基代替feeder。) j$ Z/ d' f4 C- b/ Q
条件培养基制作方法如下:1 p* l3 E+ B3 W5 `$ [; K& H; [
Preparation of MEF- Conditioned Medium (MEF-CM)0 {! f( {" u- r) h
1. Plate 4 x 106 mitomycin C treated MEFs in a T75 Flask coated with 0.5% gelatin, in complete MEF medium.9 A5 K$ ]# z7 l# a
2. The following day, replace the MEF medium with 37.5 ml 20% KSR hESC medium containing 4 ng/ml bFGF, and incubate for 24 hrs at 37°C, 5% CO2.
3 e$ F# \ w1 k* ~0 F% v3. Collect MEF-CM from the flasks after 24 hrs and 0.22 μM filter sterilize. MEF-CM can be used fresh or can be frozen.& U+ X" a5 V2 k/ E% K
4. Add fresh 20% KSR hESC medium containing 4 ng/ml bFGF to the flasks.
- F/ |$ _0 \, L0 V( M0 E5. Collect MEF-CM for up to seven days using this procedure.
2 t' V" W8 a$ x1 X! t4 t6. Depletion of L-Glutamine and bFGF from the MEF-CM is assumed, and L-Glutamine (to 2 mM final), and bFGF (to 4 ng/ml final) are therefore added back prior to using MEF-CM with hESCs. Freshly thawed ß-Mercaptoethanol (ß-Me) is added to 0.1 mM final fresh each day of use. |
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