Compositions and Methods for Modulating Osteoblast Cell Differentiation and Bone Generation Through HIF-1a
First Claim
1. A method of identifying a compound that improves bone mass or volume, wherein the method comprises the steps of:
- a. providing an osteoblast or bone precursor cell;
b. contacting the cell with a test compound; and
c. determining whether an increase in dimerization, nuclear translocation, and/or transcriptional activity of a HIF-1α
/HIF-1β
complex occurs in the cell contacted with the compound, said increase being an indication that the compound improves bone mass or volume.
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Abstract
The present invention provides a novel screening tool for the determination of compounds capable of promoting bone healing, promoting osteoblast cellular differentiation, improving bone mass or volume, and/or promoting osteogenesis that could be used in the treatment of various bone-loss or bone density decreasing disorders. The present invention also provides a screening tool for the determination of compounds capable of inhibiting osteoblast cellular differentiation, decreasing bone mass or volume, and/or inhibiting osteogenesis. Also provided are compositions and methods for the treatment of various bone-loss or bone density decreasing disorders.
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Citations
35 Claims
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1. A method of identifying a compound that improves bone mass or volume, wherein the method comprises the steps of:
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a. providing an osteoblast or bone precursor cell; b. contacting the cell with a test compound; and c. determining whether an increase in dimerization, nuclear translocation, and/or transcriptional activity of a HIF-1α
/HIF-1β
complex occurs in the cell contacted with the compound, said increase being an indication that the compound improves bone mass or volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for making a compound that increases osteoblast cell differentiation, improves bone mass or volume, and/or promotes osteogenesis, comprising the steps of:
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a. providing an osteoblast or bone precursor cell; b. contacting the cell with a test compound; c. determining whether an increase in dimerization, nuclear translocation, and/or transcriptional activity of a HIF-1α
/HIF-1β
complex occurs in the cell contacted with the compound, said increase being an indication that the compound increases osteoblasts cell differentiation, improves bone mass or volume, and/or promotes osteogenesis; andd. manufacturing the compound.
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11. A method of identifying a compound that promotes osteogenesis, wherein the method comprises the comprises the steps of:
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a. providing an osteoblast or bone precursor cell; b. contacting the cell with a test compound; and c. determining whether an increase in dimerization, nuclear translocation, and/or transcriptional activity of a HIF-1α
/HIF-1β
complex occurs in the cell contacted with the compound, said increase being an indication that the compound promotes osteogenesis. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of identifying a compound that increases osteoblast cell differentiation, wherein the method comprises the steps of:
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a. providing an osteoblast or bone precursor cell; b. contacting the cell with a test compound; and c. determining whether an increase in dimerization, nuclear translocation, and/or transcriptional activity of an HIF-1α
/HIF-1β
complex occurs in the cell contacted with the compound, said increase being an indication that the compound increases osteoblast cell differentiation. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. The present invention also provides for methods of identifying a compound capable of decreasing osteoblast cell differentiation, decreasing bone mass or volume, and/or increasing osteoclast cell differentiation, wherein the methods
a. providing an osteoblast or bone precursor cell; -
b. contacting the cell with a test compound; and c. determining whether a decrease in dimerization, nuclear translocation, and/or transcriptional activity of a HIF-1α
/HIF-1β
complex occurs in the cell contacted with the compound, said decrease being an indication that the compound decreases osteoblast cell differentiation, decreases bone mass or volume, and/or increases osteoclast cell differentiation.
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31. A process for making a compound that decreases osteoblast cell differentiation, decreases bone mass or volume, and/or increases osteoclast cell differentiation, comprising the steps of:
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a. providing an osteoblast or bone precursor cell; b. contacting the cell with a test compound; and c. determining whether a decrease in dimerization, nuclear translocation, and/or transcriptional activity of a HIF-1α
/HIF-1β
complex occurs in the cell contacted with the compound, said decrease being an indication that the compound decreases osteoblast cell differentiation, decreases bone mass or volume, and/or increases osteoclast cell differentiation; andd. manufacturing the compound.
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32. A compound for use in promoting the activity of HIF-1α
- for the treatment of a disease state, such as, but not limited to osteoporosis, osteopenia, or a bone-related disorder selected from the group consisting of osteoporosis, bone fractures, hypercalcemia of malignancy, osteopenia or osteolytic lesions due to bone metastases, periprosthetic osteolysis, familial expansile osteolysis, periodontal disease, tooth loss, rheumatoid arthritis, osteoarthritis, hyperparathyroidism, Paget'"'"'s disease, osteodystrophy, myositis ossificans, Bechterew'"'"'s disease, malignant hypercalcernia, bone loss, bone abnormalities due to steroid hormone treatment, bone abnormalities caused by cancer therapeutics, abnormally increased bone turnover, osteomalacia, Bechet'"'"'s disease, hyperostosis, osteopetrosis, osteogenesis imperfecta, rachitis, immobilization-induced osteopenia, expansile skeletal hyperphosphatasia, and glucocorticoid-induced osteoporosis.
- View Dependent Claims (33, 34, 35)
Specification