Fractionation of Nuclear and Cytoplasmic RNA by Trizol--分别提取细胞核和细胞质RNA

T℃OS-M6 cells grow in 6-well plates, 2ml media total

T℃V1PD cells grow in 100mm plates.

1: Aspirate off the media from the cells and was the cell monolayers with 2x5ml (To 100mm dish) or 2x1ml (to 6-well plates) ice cold TD (4o C is OK). Be very gentle when washing the cells as transfected cells tend t℃ome off the dish easily. You had better transfect 9 dishes or 18 wells at a same time, so that you will have 18 Eppendorff tubes that can be spun down in one centrifuge.

2: Add 1ml ice cold TD to the well. T℃OS-M6 cells, they can be washed off simply by pipetting 20 times per well. T℃V1-PD cells, they should be scraped by rubber policeman. Handle the rubber policeman at the first 1/3 so that you will not spill the solution. Transfer the cells to a 1.5ml Eppendorff tube. Put each Eppendorff tube on ice until donw with all samples.

3: Spin cells at RT for 30sec at maxi speed

From now on, keep tubes on ice as much as possible

4: Remove supernatant with aspirator. Resuspend the cells with 100μl ice cold TD by pipetting up and down 10 times. Add 100μl VRC/1%NP-40/TD. Vortex 5 second and put on ice.

VRC/1%NP-40/TD:

2.4 ml 1%NP-40/TD 125ul VRC

4.8 ml 1%NP-40/TD 250μl VRC

5: Keep on ice for 5 min, vortex 5 seconds again. Quick spin 30 seconds at maxi speed at RT.

6: Transfer cytoplasmic fraction to a new tube, put nuclear samples on ice now.

7: T℃ytoplasmic fractions, add 0.9ml 1.2xTRIzol reagent. Vortex to mix completely, sit at RT for 5 minutes.

8: Add 200μl chloroform:IAA 200μl per 1ml TRIzol. Vortex at scale 6 for 1 min.

9: 4o C spin 20min, less than 12000 g. The RNA should exist in supernatant exclusively

10. Transfer supernatant 3x200μl = 600 ul to a new tube carefully. The total volume of the supernatant should around 650-700μl, no need to transfer them all.

11: Add 0.25ml isopropanol

0.25ml RNA precipitation solution

Mix by vortex and sit at RT for 10 min

12: 4o C spin 10min

13: Aspirate off supernatant, wash with 70% EtOH, spin 5min at RT

14: Dry without heat in speed vac for 5 to 10 min

15: Resuspend in 50μl TE completely.