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Complete Growth Medium
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The base medium for this cell line is ATCC-formulated Dulbecco's Modified Eagle's Medium, Catalog No. 30-2002. To make the complete growth medium, add the following components to the base medium: fetal bovine serum to a final concentration of 15% This medium is formulated for use with a 5% CO2 in air atmosphere. (Standard DMEM formulations contain 3.7 g/L sodium bicarbonate and a 10% CO2 in air atmosphere is then recommended).
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Subculturing
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Procedure:
To insure the highest level of viability, be sure to warm media and Trypsin/ EDTA to 37ºC before using it on the cells.
Cells should be split when they reach confluency. A split ratio of 1:5 to 1:7 is recommended. Volumes used in this protocol are for 225 cm2 (T225); proportionally reduce or increase amount of dissociation medium for culture flasks of other sizes.
- Remove and discard culture medium.
- Briefly rinse the cell layer with 1X PBS (SCRR-2201) solution to remove all traces of serum, which contain trypsin inhibitor.
- Add 5 mL of Trypsin-EDTA (0.25% (w/v) Trypsin-0.53 mM EDTA solution, ATCC# 30-2101) solution to flask and incubate for 1 minute, gently tapping the flask observe cells under an inverted microscope until cells detach (usually within 1 to 2 minutes).
- Add 6.0 to 8.0 mL of complete growth medium and rinse surface of the flask to detach all cells. Gently pipetting up and down will break cell clumps.
- Transfer all cells into a centrifuge bottle or tube and centrifuge at 270 xg for 5 minutes.
- Remove and discard the supernatant
- Add 10 mL complete growth medium to cell pellet and with 10 mL pipette resuspend the cells gently (create a single-cell suspension).
- Add more complete growth medium to cell suspension as needed to plate cells at approximately 5x106/T225 flask.
- Place flasks in incubator @ 37°C with a 5% CO2 in air atmosphere.
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T225
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225
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10 ± 0.2
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6 ± 0.2
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6 ± 0.2
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30
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75
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75
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5 ± 0.1
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3 ± 0.1
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3 ± 0. 1
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12
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T25
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25
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3 ± 0.1
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1.5 ± 0.1
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1.5 ± 0.1
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6
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Note: For more information on enzymatic dissociation and subculturing of cell lines consult Chapter 13 in Culture of Animal Cells, a manual of Basic Technique by R. Ian Freshney, 5th edition, published by Alan R. Liss, N.Y., 1994.
Subcultivation Ratio: A subcultivation ratio of 1:5 to 1:7 is recommended
Medium Renewal: Twice a week or as pH decreases
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Cryopreservation
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Complete growth medium supplemented with an additional 40% FBS and 10% (v/v) DMSO
Cell culture tested DMSO is available as ATCC Catalog No. 4-X.
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Culture Conditions
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Atmosphere: Air, 95%; carbon dioxide (CO2), 5%
Temperature: 37°C
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