Compositions and methods for inducing osteogenesis
a technology applied in the field of compositions and methods for inducing osteogenesis, can solve the problems of bone loss, bone-related diseases, and difficulty in obtaining osteoblasts in sufficient numbers to enable effective therapy, and achieve the effect of inducing osteogenesis
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example 1
Synthesis and Characterization of Compound A
[0161]The phosphine ligand for the Pd-catalyzed coupling was purchased from Strem Chemicals. All the other chemicals were purchased from Aldrich.
[0162]Solid Phase Synthesis
[0163]The C6 position of 2,6-dichloro-9-substituted-purine was substituted by suspending (4-formyl-3,5-dimethoxyphenoxy)methyl polystyrene resin (PAL-resin) in dimethylformamide (DMF). A suitably substituted aniline, acetic acid and sodium triacetoxyborohydride were then added to the solution. The mixture was shaken gently at room temperature for 12 hours. The resulting aniline bound resin was then washed with DMF, methanol and dichloromethane. The aniline bound resin was then reacted with 2,6-dichloro-9-substituted-purine and diisopropylethylamine in 1-butanol at 80° C. for 12 hours. The resulting resin was then washed as described above to afford the 2-chloro-6-resin bound aniline-9-substituted purine.
[0164]The C2 position of the purine ring was subsequently substitute...
example 2
Cell Culture and Osteogenesis Detection Assays
[0169]Cell Culture: Mouse embryonic mesoderm fibroblasts C3H10T1 / 2 cells were obtained at the 10th passage from ATCC. Cells between the 12th and 15th passages were used in these experiments. Cells beyond 15th passage were discarded. Mouse embryonic mesoderm fibroblasts C3H10T1 / 2 cells and mouse pre-osteoblasts MC3T3-E1 cells (from German collection of microorganisms and cell cultures) were cultured at 37° C. in 5% CO2 in MEM-α media (Gibco) supplemented with 10% heat inactivated FBS (Gibco), 50 U / mL penicillin and 50 μg / mL of streptomycin (Gibco). When cells were 80% confluent, they were split a 1:5. Mouse pre-adipocytes 3T3-L1 cells (from ATCC) and mouse myoblasts C2C12 cells (from ATCC) were cultured at 37° C. in 5% CO2 in DMEM (Gibco) supplemented with 10% heat inactivated FBS (Gibco), 50 U / mL penicillin and 50 μg / mL of streptomycin (Gibco).
[0170]Alkaline Phosphatase Assay: C3H10T1 / 2 cells were expanded in T175 flasks; cells at the 13...
example 3
Identification of Compound A as a Compound with Osteogenesis Inducing Activity
[0174]A heterocycle combinatorial library of approximately 50,000 compounds with purine, pyrimidine, quinazoline, pyrazine, phthalazine, pyrazine and quinoxaline-based scaffolds was screened to identify small molecules with osteogenesis inducing activity (see, e.g., Ding et al., J. Am. Chem. Soc. 124:1594 (2002); Gray et al., Science 281:533 (1998); Rosania et al. Nat. Biotechnol. 18:304 (2000); and Rosania et al., Proc. Natl. Acad. Sci. USA. 96:4797 (1999). One 2,6,9-trisubstituted purine was found to have significant activity in the ALP enzymatic assay. This compound, which has morpholinoaniline substitution at the C6 position of purine nucleus, was named Compound A. Further studies indicated that the EC50 for Compound A is 1 μM in C3H10T1 / 2 cells; moreover, this compound can lead to greater than a 50 fold increase in ALP after treatment for 4 days as compared with 1% DMSO treatment, and is more effectiv...
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