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是millipore的
$ r' r E0 n" p- J* {- b1. Culture ES cells for five days prior to analyzing AP activity, at low to medium density (NOTE: This5 G1 g4 K) M+ Q( Y$ S3 c- ?" i
time-period is critical if activity levels of AP needs to be observed. According to our findings, five& Q9 x& L3 }0 _8 I! N
days of culturing are optimal for good AP stain visualization).: d/ [! K2 e6 s; x# _8 s
2. On day five, aspirate media and fix ES or EC cells with a fixative (e.g. 4% Paraformaldehyde in" l3 S$ r3 B h6 S
PBS) for 1-2 minutes.
) y0 ]! y* J9 l! B& l& Z& MNote: Do not overfix. Fixing cells longer than 2 minutes will result in the inactivation of alkaline
7 I U; y4 f, E# y- Dphosphatase.
# L! H! X v) x' m3. Aspirate fixative and rinse with 1 X Rinse Buffer. DO NOT allow wells to dry.
# t: d9 [4 Z2 i# A8 a
+ o5 q! K& @0 J6 P- P/ h4 v: h8 I5 t4. Prepare reagents for Alkaline Phosphatase staining as described in “Preparation of Reagents”section.* ^% m+ K, a9 Y3 D& ^! O' I- S
5. Add enough stain solution to cover each well (e.g. 0.5mL for a well of a% {! R$ x; J g$ @" D
24-well plate). Incubate in dark at room temperature for 15 minutes.
@; g3 ~6 r; e3 W3 k# y6 F6. Aspirate staining solution and rinse wells with 1 X Rinse Buffer. Cover cells with 1 X PBS to$ h# \% }2 R7 H+ l; C6 I
prevent drying and then count the number of colonies expressing AP (red stem cell colonies),
9 e% [: ^* {" g/ x7 d$ A, ~versus the number of differentiated colonies (colorless).
( m6 _: @1 p2 A9 Q7. AP staining criteria: Greater than 90% of colonies should remain undifferentiated and express alkaline phosphatase in the well containing 103 Units of LIF. P value shall be ³ 0.05. |
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