Tina:Osteogenic differentiation on mES brainbow cells (OSG)

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Seeding density test (OSG_E1)[edit]

  • Purpose: To determine the seeding density of mESCs for osteogenic differentiation


Test #1 (OSG_E1_T1)[edit]

  • Date: 7/5/2012 ~ 7/7/2012
  • Cells: P11 InsCAGGsAlov3 (mES brainbow cells)
  • 7/5: P10 mES brainbow cells (on feeder) were trypsinized. Cells were then divided into two groups. Group one were seeded 1:2, 1:4, 1:6, 1:8 and 1:12 on gelatin coated glass-well immediately. Group two were let sit for 15 min and then seeded 1:2, 1:4, and 1:6 on gelatin coated glass-well.
  • 7/6 (next day of seeding): Take pictures of each well. Find out the best seeding manner and seeding density.
  • According to results, seeding at 1:6 with 15 min sitting time is the best seeding density for osteogenic induction (one day after seeding).


Medium composition test (OSG_E2)[edit]

  • Purpose: To test the effects of osteogenic differentiation media on mESCs


Test #1 (OSG_E2_T1)[edit]

  • Date: 7/1/2012 ~ 7/9/2012
  • Cells: P10 InsCAGGsAlov3 (mES brainbow cells)
  • Osteogenic differentiation media (with 1% serum):
Component Volumn Final concentration
MEM 193ml
Serum 2ml 1%
Dexamethasone 200ul of 0.1mM stock 0.1uM
Ascorbic acid 1ml of 10mg/ml stock 50ug/ml
b-GP 2ml of 1M stock 10mM
PenStrep 2ml 1%
Total 200 mL
  • 7/1: P9 mES brainbow cells (on feeder) were trpsinized, let sit for 10 min, and then seeded 1:5 (two wells) and 1:10 (4 wells) onto feeder free system (now become P10).
  • 7/2 and 7/3: Cell density was still low. Induction should wait for one more day.
  • 7/4: Cell density became too high. Several colonies were formed. Therefore, the best time point to induce osteogenic differentiation is ‘’1-2 days after seeding’’’ (need further confirmation).
  • Add induction media to each well on 7/4 to observe the cell morphology changes at the beginning of osteogenic differentiation.
  • 7/5: Observe lots of cell death within each well. The concentration of chemicals in induction media might need further adjustment. (Pictures.)
  • 7/6: Possible cause of cell death: (1)chemical concentration is too high (toxic). (2)serum concentration is too low.

Further tests should be arranged (with lower chemical concentration and/or higher serum concentration).


Test #2 (OSG_E2_T2)[edit]

  • Date: 7/13/2012 ~ 7/27/2012
  • Cells: P10 InsCAGGsAlov3 (mES brainbow cells)
  • Osteogenic differentiation media:

Basal media were changed from MEM to DMEM. Different concentration of serum were tested.

Component (volumn)/group 5% serum 15% serum 2me
DMEM 193ml 193ml 193ml
Serum 5%(10ml) 15%(30ml) 15%(30ml)
0.1 uM Dexamethasone 200ul of 0.1mM stock 200ul of 0.1mM stock 200ul of 0.1mM stock
50ug/ml Ascorbic acid 1ml of 10mg/ml stock 1ml of 10mg/ml stock 1ml of 10mg/ml stock
10mM b-GP 2ml of 1M stock 2ml of 1M stock 2ml of 1M stock
1% PenStrep 2ml 2ml 2ml
1% Glutamax - - 2ml
1% NEAA - - 2ml
0.1% 2me - - 200ul
Total 200 mL 200 mL 200 mL
  • 7/13: P9 mES brainbow cells (on feeder) were trpsinized, let sit for 15 min, and then seeded 1:6 (three wells) onto feeder free system (now become P10).
  • 7/14(Day 0): PBS wash twice and then add induction media to each well.
  • 7/15-7/16: Take pictures. Cells look ok. Scheduled to change media three days after induction.
  • 7/17 (Day 3): Take pictures. Observed some cell death. Change media.
  • 7/18: Take pictures. Number of cell death were under control. Important finding: Cell death occurred less in 5% serum group. This might suggests that cell death may be due to lack of nutrition. Managed to change induction media daily hereafter.
  • 7/19-7/26: Change media and take pictures daily.
  • 7/27: Perform Alizarin Red S staining. (Fixed with 3.7% paraformaldehyde for 20 min; washed with Ca- Mg- PBS; stained for 1 hour.)


Test #3 (OSG_E2_T3)[edit]

  • Date: 7/30/2012 ~ 8/3/2012
  • Cells: P12 InsCAGGsAlov3 (mES brainbow cells)
  • Osteogenic differentiation media: 0, 2.5, 5, 7.5, 10, 12.5, and 15% serum in osteogenic differentiation media were tested.
  • 7/30: P11 mES brainbow cells (feeder free) were trpsinized (TrpLE), let sit for 15 min, and then seeded 1:6 onto gelatin coated 6-well plates (now become P12).
  • 7/31(Day 0): PBS wash twice and then add induction media to each well.
  • Change media daily.
  • 8/3 (Day 3): Cell proliferated too fast. Cell colony became very big. It's really difficult to observe osteogenic differentiation. Therefore, cells were discarded.
  • Cell seeding density needs to be adjusted. Try 1:12 or 1:18 next time.


Test #4 (OSG_E2_T4)[edit]

  • Date: 8/3/2012 ~ ongoing work
  • Cells: P13 InsCAGGsAlov3 (mES brainbow cells)
  • Osteogenic differentiation media: 5, 7.5, 10, 12.5, and 15% serum in osteogenic differentiation media were tested.
  • 8/3: P12 mES brainbow cells (feeder free) were trpsinized (TrpLE), let sit for 15 min, and then seeded 1:8 onto gelatin coated 6-well plates (now become P13).
  • 8/4 (Day 0): PBS wash twice and then add induction media to each well. 0%, 1%, 5%, 10%, 15% OSG: each for five 6-wells.
  • 8/5 (Day 1): PBS wash twice and change media. There are cell death occurred in 0% and 1% serum. So, made some adjustment: 0% were changed into 7.5% OSG; 1% were changed into 12.5% OSG.
  • Change media daily (PBS wash once).


Induction efficiency test (OSG_E3)[edit]

  • Purpose: To test the osteogenic differentiation efficiency of mESCs-derived osteoblasts


Test #1 (OSG_E3_T1)[edit]

  • Date: 7/30/2012 ~ 8/4/2012
  • Cells: P12 InsCAGGsAlov3 (mES brainbow cells)
  • Osteogenic differentiation media: 5% serum in osteogenic differentiation media.
  • 7/30: P11 mES brainbow cells (feeder free) were trpsinized (TrpLE), let sit for 15 min, and then seeded 1:6 onto gelatin coated 25Ts (now become P12).

7/31(Day 0): PBS wash twice and then add induction media to each well. Change media daily. 8/4 (Day 4): Like OSG_E2_T3, also observed lots of cell death. Cell proliferated too fast. Cell colony became very big. Therefore, cells were discarded. Cell seeding density needs to be adjusted. Try 1:12 or 1:18 next time.


Test #2 (OSG_E3_T2)[edit]

  • Date: 8/3/2012 ~ ongoing work
  • Cells: P13 InsCAGGsAlov3 (mES brainbow cells)
  • Osteogenic differentiation media: 5% serum in osteogenic differentiation media.
  • 8/3: P12 mES brainbow cells (feeder free) were trpsinized (TrpLE), let sit for 15 min, and then seeded 1:18 onto gelatin coated 25T (now become P13).
  • 8/4 (Day 0): PBS wash twice and then add induction media.
  • Change media daily (PBS wash once).
  • 8/7 (Day 3): Collect sample from one 25T. Store at -80C.


Test #3 (OSG_E3_T3)[edit]

  • Date: 8/6/2012 ~ ongoing work
  • Cells: P14 InsCAGGsAlov3 (mES brainbow cells)
  • Osteogenic differentiation media: 5% serum in osteogenic differentiation media.
  • 8/6: P13 mES brainbow cells (feeder free) were trpsinized (TrpLE), let sit for 30 min, and then seeded 1:18 onto gelatin coated 35mm dishes (now become P14).
  • 8/7 (Day 0): PBS wash twice and then add induction media (5% serum). Perform Alizarin red S staining in one 35mm dish. (Fix for 30 min; Stain for 20 min.)
  • Change media daily (PBS wash once).