人股骨成骨细胞Cell Specification
Bone is a dynamic tissue, being continuously remodeled by the coordinated actions of osteoclasts
and osteoblast lineage. Osteoblasts, the bone-forming cells, are derived originally from
pluripotent mesenchymal stem cells. They synthesize
HO-f from ScienCell Research Laboratories are isolated from human femur. HO-f are
cryopreserved at primary cultures and delivered frozen. Each vial contains >5 x 10
and secrete organic extracellular matrix,
osteoid, which is composed primarily of type I collagen. Osteoid is calcified by osteoblasts and
during this process the cells become encased in lacunae within the calcified material and become
osteocytes. Osteoblasts express protease-activated receptor-1 and vescular endothelial cell
growth factor [1]. Studies show that Leukemia inhibitory factor can bind to the osteoblast cell
surface and induce bone formation both in vitro and in vivo [2]. The balance between osteoblast
recruitment, proliferation, differentiation and apoptosis in sutures between cranial bones is
essential for calvarial bone formation [3].
5
 人股骨成骨细胞Recommended Medium
cells in 1 ml
volume. HO-f are characterized by the cytochemically detection of AP and mineral deposition.
HO-f are negative for HIV-1, HBV, HCV, mycoplasma, bacteria, yeast and fungi. HO-f are
guaranteed for 15 population doublings at the conditions provided by ScienCell Research
Laboratories.
It is recommended to use Osteoblast Medium (OsM, Cat. No. 4601) for the culturing of HO-f in
vitro.
Product Use
HO-f are for research use only
Storage
. It is not approved for human or animal use, or for application in
in vitro diagnostic procedures.
Directly and immediately transfer cells from dry ice to liquid nitrogen upon receiving and keep
the cells in liquid nitrogen until cell culture needed for experiments.
Shipping
Dry ice.
Reference
[1] Steinbrech, D. S., Mehrara, B. J., Saadeh, P. B., Greenwald, J.A., Spector, J. A., Gittes, G. K. and Longaker, M.
T. (2000) VEGF expression in an osteoblast-like cell line is regulated by a hypoxia response mechanism. Am. J.
Physiol. Cell Physiol. 278: C853-C860.
[2] Dazai, S., Akita, S., Hirano, A., Rashid, M. A., Naito, S., Akino, K., Fujii, T. (2000) Leukemia inhibitory factor
enhances bone formation in calvarial bone defect J. Craniofac. Surg. 11(6):513-20.
[3] Marie, P. J., Debiais, F., Hay, E. (2002) Regulation of human cranial osteoblast phenotype by FGF-2, FGFR-2
and BMP-2 signaling. Histol. Histopathol.17(3):877-85.
Instruction for culturing cells
 人股骨成骨细胞Caution: Cryopreserved cells are very delicate. Thaw the vial in a 37o
and return them to culture as quickly as possible with minimal handling!
C waterbath
Set up culture after receiving the order:
1. Prepare a poly-L-lysine coated flask (2 μg/cm2
, T-75 flask is recommended). Add 10 ml
of sterile water to a T-75 flask and then add 15 μl of poly-L-lysine stock solution (10
mg/ml, ScienCell cat. no. 0413). Leave flask in incubator overnight (minimum one hour
at 37o
2. Prepare complete medium: decontaminate the external surfaces of medium and medium
supplements with 70% ethanol and transfer them to sterile field. Aseptically open each
supplement tube and add them to the basal medium with a pipette. Rinse each tube with
medium to recover the entire volume.
C incubator).
3. Rinse the poly-L-lysine coated flask with sterile water twice and add 20 ml of complete
medium to the flask. Leave the flask in the hood and go to thaw the cells.
4. Place the vial in a 37o
5. Dispense the contents of the vial into the equilibrated, poly-L-lysine coated culture
vessels. A seeding density of 5,000 cells/cm
C waterbath, hold and rotate the vial gently until the contents are
completely thawed. Remove the vial from the waterbath immediately, wipe it dry, rinse
the vial with 70% ethanol and transfer it to a sterile field. Remove the cap, being careful
not to touch the interior threads with fingers. Using a 1 ml eppendorf pipette gently
resuspend the contents of the vial.
2
Note: Dilution and centrifugation of cells after thawing are not recommended since these
actions are more harmful to the cells than the effect of DMSO residue in the culture. It is
also important that cells are plated in poly lysine coated culture vessels that promote
cell attachment and growth
is recommended.
6. Replace the cap or cover of flask, and gently rock the vessel to distribute the cells evenly.
Loosen cap if necessary to permit gas exchange.
7. Return the culture vessels to the incubator.
8. For best result, do not disturb the culture for at least 16 hours after the culture has been
initiated. Change the growth medium the next day to remove the residual DMSO and
unattached cells, then every other day thereafter.
Maintenance of Culture:
1. Change the medium to fresh supplemented medium the next morning after establishing a
culture from cryopreserved cells.
2. Change the medium every three days thereafter, until the culture is approximately 70%
confluent.
3. Once the culture reaches 70% confluence, change medium every other day until the
culture is approximately 90% confluent.
Subculture:
1. Subculture the cells when they are over 90% confluent.
2. Prepare poly-L-lysine coated flasks (2 μg/cm2
3. Warm medium, trypsin/EDTA solution (T/E, cat. no. 0103), trypsin neutralization
solution (TNS, cat. no. 0113), and DPBS to room temperature. We do not recommend
warming the reagents and medium at 37
) one day before subculture.
o
4. Rinse the cells with DPBS.
C waterbath prior to use.
5. Add 8 ml of DPBS first and then 2 ml of trypsin/EDTA solution into flask (in the case of
T-75 flask); gently rock the flask to make sure cells are covered by trypsin/EDTA
solution; incubate the flask at 37o
C incubator for 1 to 2 minutes or until cells are
completely rounded up (monitored with inverted microscope). During incubation, prepare
a 50 ml conical centrifuge tube with 5 ml of fetal bovine serum (FBS, cat. no. 0500);
transfer trypsin/EDTA solution from the flask to the 50 ml centrifuge tube (a few percent
of cells may detached); continue incubate the flask at 37o
Note: Use ScienCell Research Laboratories’ trypsin/EDTA solution that is optimized to
minimize the killing of the cells by over trypsinization.
C for 1 minutes (no solution in
the flask at this moment); at the end of trypsinization, one hand hold one side of flask and
the other hand gently tap the other side of the flask to detach cells from attachment; check
the flask under inverted microscope to make sure all cells are detached, add 5 ml of
trypsin neutralization solution to the flask and transfer detached cells to the 50 ml
 人股骨成骨细胞centrifuge tube; add another 5 ml of TNS to harvest the residue cells and transfer it to the
50 ml centrifuge tube. Examine the flask under inverted microscope to make sure the cell
harvesting is successful by looking at the number of cells left behind. There should be
less than 5%.
6. Centrifuge the 50 ml centrifuge tube (harvested cell suspension) at 1000 rpm (Beckman
Coulter Allegra 6R centrifuge or similar) for 5 min; re-suspend cells in growth medium.
7. Count cells and plate cells in a new, poly-L-lysine coated flask with cell density as
recommended.
Caution: Handling human derived products is potentially biohaza dous. Although each cell strain tests negative for
HIV, HBV and HCV DNA, diagnostic tests are not necessarily 100% accurate, therefore, proper precautions must
be taken to avoid inadvertent exposure. Always wear gloves and safety glasses when working these materials. Never
mouth pipette. We recommend following the universal procedures for handling products of human origin as the
minimum precaution against contamination [1].
[1]. Grizzle, W. E., and Polt, S. S. (1988) Guidelines to avoid personal contamination by infective agents in research
laboratories that use human tissues. J Tissue Culture Methods. 11(4).