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

        互联网

        7431

        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.


        To nuclear fractions:

        16: Resuspend nuclear samples in 200 ul 0.5%NP-40/TD by pipetting 10 times. Vortex 5 seconds and put on ice for 5 minutes.

        16: Spin 30 seconds at RT, maxi speed.

        17: Aspirate off supernatant and resuspend samples in 200 ul 0.5%NP-40/TD by pipetting 10 times again.

        18: Follow the steps from 7 to 15 again.

         

        Solutions:

        TD: 2L

        NaCl 16.0g

        KCl 0.76g

        Na2 HPO4 0.20g

        Tris-Cl 6g

        Water to 2 L, pH 7.4-7.5

        1xTRIzol: 200ml

        Final Add

        Guanidine thiocyanate 0.8 M FW 118.2 18.912 g

        Ammonium thiocyanate 0.4 M FW 76.12 6.09 g

        Sodium Acetate 0.1 M, pH 5 Stock 1M 20 ml

        Glycerol 5% 10ml

         

        Add water to 100ml

        Mix well

        Filter

        Add phenol 76 ml and mix. Phenol can be solved in 60℃ water bath.

        The final concentration of phenol is 38%. Add water to 200 ml total volume.

        pH ~ 4.5.

        Wrap with aluminum foil.

        1.2xTRIzol: 200ml

        Final Add

        Guanidine thiocyanate 0.8 M x 1.2 = 0.96 M 22.694 g

        Ammonium thiocyanate 0.4 M x 1.2 = 0.48 M 7.308 g

        Sodium Acetate 0.1 M x 1.2 = 0.12 M, pH 5 Stock 1M 24 ml

        Glycerol 5% x 1.2 = 6% 12ml

         

        Add water to 100ml

        Mix well

        Filter

        Add phenol 76 ml x 1.2 = 91.2 and mix. Phenol can be solved in 60o C water bath.

        The final concentration of phenol is 38% x 1.2 = 45.6%. Add water to 200 ml total volume.

        pH ~ 4.5.

        Wrap with aluminum foil.

        RNA precipitation solution: 200 ml

        NaCl 1.2 M 14.026 g FW 58.44

        Sodium Citrate 0.8M 47.056 g FW 294.10

        Autoclaved (can't be filtered through the membrane)

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