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多谢,请问可以说具体些吗? * Q8 _* I( h% G( Q怎么操作?作者: 千细胞 时间: 2013-9-3 09:11
Samples of cell aggregates were made into frozen blocks by fixing with 4% (wt/v) paraformaldehyde for 30 mins and then with 30% sucrose at 4uC overnight.作者: changbaihou 时间: 2013-9-3 10:38
千细胞 发表于 2013-9-3 09:11 0 z2 B$ K/ e# G1 Z( F
Samples of cell aggregates were made into frozen blocks by fixing with 4% (wt/v) paraformaldehyde fo ...
: S1 P' U0 e8 s, m1 Q多谢回复,然后呢?怎么用OCT包埋?5 |$ c e8 G& l6 o* }+ x9 M7 u, J
请问哪里可以找到protocol啊?作者: 细胞海洋 时间: 2013-9-4 10:15
changbaihou 发表于 2013-9-3 10:38 / ?8 n6 Y. c6 p多谢回复,然后呢?怎么用OCT包埋? " V) V% M, A4 v# ]1 g5 D请问哪里可以找到protocol啊?
7 F3 ~4 J$ t7 r8 ]; b r2 P, i9 a3 Q0 O) a3 ?Preparation of neurospheres for cryostat sectioning and immunocytochemistry: + `' ] z& ^* k 4 Q, x1 _- t/ k. l, ZProcedures have been developed to section intact neurospheres. * z# W5 r- l& X$ G$ T: x6 k" {4 L
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1. Transfer the culture medium with neurospheres to a 50 ml polypropylene conical tube. $ I* t, Q% N' d F2. Allow the neurospheres to settle by gravity (approximately 30 minutes. The time for the neurospheres to settle is dependent on the size of the neurospheres.' |1 E9 m, W' r2 f! ]
# A3 l9 l& Z& `% S j" }8 eCaution * u) p |1 t& |3 b: oCentrifugation of the viable neurospheres will alter the shape of the neurospheres.3 \. @4 d3 H8 V
5 ^9 R C* |. ?' f7 T- v# \1 O3. Remove the supernatant, add and mix gently with 2.0 ml of 4.0% phosphate buffered paraformaldehyde (fixative).4 S. J. M# }, }+ `& r
4. Allow the neurospheres to settle in the tube.! b) |5 z( |, p4 F; ~; A
5. Remove the fixative supernatant with a Pasteur pipette and rinse with 5.0 ml of phosphate buffered saline (PBS). {3 Y/ P$ O0 O8 v/ ?
6. Allow the neurospheres to settle for at least 30 minutes before removal of the PBS.* j- x( U# c/ V5 o
7. Repeat the rinsing procedure at least 3 times. ' j" p& N9 N1 M: w% RImmunocytochemistry may be performed on intact neurospheres at this stage.0 i- J- @% F2 e% @; Z7 E
TIP: Observing the removal of the supernatant at any step under the dissecting scope ensures maximum withdrawal of the fluid without disturbing the cell pellet. 6 L j& U6 ?% S2 c4 B4 Q+ I) B8. Remove the final PBS rinse and add 5.0 ml of 30% sucrose (dissolved in 0.1M PBS). 9 x4 y, l T2 B# e! a" _% w9. Transfer the tube to the fridge and allow the neurospheres to settle overnight. / E# \7 c9 @" w6 R+ K10. Remove the 30% sucrose and add embedding medium for frozen tissue specimens for 1 hour (Sakura Tissue-Tek O.C.T. compound, cat. no. 4583)( c+ T8 z+ J1 s
11. Prepare the cryostat chuck with a layer of O.C.T. 5 n8 U( z# x( N: v; ]7 S' M12. Transfer the neurosphere pellet to the O.C.T. layer on the cryostat chuck.. ?9 W' e( `5 j
, I+ a8 W6 \6 g" m6 O* Y Caution 9 }. q r Y8 H' J2 A5 P- l/ @You can lose the neurosphere pellet quickly during the transfer of the pellet from the tube to the cryostat chuck. With a Pasteur pipette or an 1000 μl Eppendorf pipettor (using the blue tips) pre-load a small amount of O.C.T. into the tip and then withdraw the neurosphere pellet into the tip, continuous with the pre-loaded O.C.T. Try not to induce any air bubbles into the O.C.T. $ L7 F4 o0 P* U" o- _/ b ! P; S4 q) o; [2 z6 O13. Cut sections at desired thickness and collect on APTEX (3-Aminopropyl) triethoxy-silane) (Sigma cat. no. A3648) coated glass microscope slides.$ n. L H+ ~! m# X9 z) X
14. Continue with the desired immunocytochemical procedure (non-specific blocking, application of primary antibody etc.).作者: bin 时间: 2013-9-4 14:00