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使用MEF来源的条件培养基代替feeder。: r4 ^1 p) V. M2 Y, m9 x6 b/ y
条件培养基制作方法如下:) p- k3 b- P4 H0 g$ P- P
Preparation of MEF- Conditioned Medium (MEF-CM)& {& S8 C, Q9 D' w& d, |
1. Plate 4 x 106 mitomycin C treated MEFs in a T75 Flask coated with 0.5% gelatin, in complete MEF medium.9 u! r- I- {+ y: c
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.* \9 C. R" e0 r+ k( h. E
3. 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.
. A. X( b& e+ X# A0 a- y4. Add fresh 20% KSR hESC medium containing 4 ng/ml bFGF to the flasks.
- f/ d0 ^& c: g$ C5. Collect MEF-CM for up to seven days using this procedure.
1 M6 H4 j$ \9 f* Z* d6. 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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