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- C9 f1 I9 L& `; B# y& y是millipore的0 n* u1 F% w5 y* U
1. Culture ES cells for five days prior to analyzing AP activity, at low to medium density (NOTE: This0 D& ^& Y5 S3 |: F* G
time-period is critical if activity levels of AP needs to be observed. According to our findings, five) I; x+ h% d2 q9 c& \) T0 n% j( k
days of culturing are optimal for good AP stain visualization). p9 ?3 [& x' o" T
2. On day five, aspirate media and fix ES or EC cells with a fixative (e.g. 4% Paraformaldehyde in, t o5 A) `* b5 C$ A' t+ o) G
PBS) for 1-2 minutes.' ~* b* |7 x$ [
Note: Do not overfix. Fixing cells longer than 2 minutes will result in the inactivation of alkaline# q% [! o. e1 ~7 w
phosphatase.% _0 r! T3 _' B; a* P1 G
3. Aspirate fixative and rinse with 1 X Rinse Buffer. DO NOT allow wells to dry.% |( B+ ^" V) Y3 o$ @" x, @
: ~5 J+ _3 j4 J) g9 }( |4. Prepare reagents for Alkaline Phosphatase staining as described in “Preparation of Reagents”section.1 d8 j& T4 w( Y" ]5 j
5. Add enough stain solution to cover each well (e.g. 0.5mL for a well of a
/ [% h- h9 m4 k5 E2 l24-well plate). Incubate in dark at room temperature for 15 minutes.7 s9 X$ z+ @. r' v* R4 t5 ^* o( v
6. Aspirate staining solution and rinse wells with 1 X Rinse Buffer. Cover cells with 1 X PBS to
' h, k. E; B5 y" ` [! Hprevent drying and then count the number of colonies expressing AP (red stem cell colonies),
+ y' M9 A7 i7 M! s7 l6 Oversus the number of differentiated colonies (colorless).6 _" ?, O7 d: M$ |, W; O
7. 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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