Proteomic methods for the identification of differentiated adipose cells and adipose derived adult stem cells

Abstract
The present invention includes method for identifying, differentiating and distinguishing undifferentiated adipose-derived adult stem cells and differentiated adipose-derived adult stem cells using the proteomic profile of an adipose cell.
Description

BRIEF DESCRIPTION OF THE DRAWINGS

For the purpose of illustrating the invention, there are depicted in the drawings certain embodiments of the invention. However, the invention is not limited to the precise arrangements and instrumentalities of the embodiments depicted in the drawings.



FIG. 1, comprising FIGS. 1A through 1C, is a series of images depicting adipogenesis in human adipose-derived adult stem cells. FIG. 1A depicts Passage 1 human adipose-derived adult stem cells under control (undifferentiated) or differentiated conditions after staining with Oil Red O at 10× magnification. FIG. 1B depicts the same cells with no magnification. FIG. 1C is a graph illustrating the percentage of Oil Red O surface area staining for an entire plate.



FIG. 2, comprising FIGS. 2A through 2C, is a series of images depicting two-dimensional polyacrylamide gel electrophoresis of protein lysates prepared from human adipose-derived adult stem cells in the undifferentiated (FIG. 2B) and differentiated (FIG. 2C) condition following induction. FIG. 2A is an image of a composite gel prepared based on features conserved on replicate gels prepared from protein extracts obtained from individual donors.



FIG. 3, comprising FIGS. 3A and 3B, is a series of graphs depicting the functionality and subcellular localization of identified proteins in undifferentiated human adipose-derived adult stem cells. The subcellular localization (FIG. 3A) and functionality (FIG. 3B) of the protein categories detailed graphically as percentages are based on n=175 individual proteins identified in the undifferentiated adipocyte cells. Abbreviations: C, Cytoplasm; CaBP, Calcium Binding Protein; Chap, Chaperone; Cytoskel, Cytoskeleton; ECM, Extracellular matrix; ER, Endoplasmic Reticulum; GBP, Guanine nucleoside Binding Protein; M, Mitochondria; Metab, Metabolism; N, Nucleus; NR, Not Reported; ProtDeg, Protein Degradation; ProtProc, Protein Processing; RNABP, RNA Binding Protein. The “Other” Location category includes the Golgi, Lysosome, Plasma Membrane, Ribosome, and Secreted while the “Other” Function category includes Amyloid Binding Protein, Cytokine, Ion Channel, Iron Binding Protein, Signal Transduction, and Transcription.



FIG. 4, comprising FIGS. 4A through 4H, is a series of images depicting protein features from 2-D gels prepared with protein lysates from undifferentiated and differentiated human adipose-derived adult stem cells. FIGS. 4A through 4D represent undifferentiated adipose-derived adult stem cells, FIGS. 4E through 4H represent differentiated adipose-derived adult stem cells. The SSP numbers identify the following protein(s): 3101, Fatty acid binding protein-adipocyte; 7204, Heat shock protein 20-like protein; 3107, Stathmin; 6521, Elfin/PDZ and LIM Domain Protein 1 and LIM and SH3 Domain Protein 1. The arrows indicate the location of the protein features.



FIG. 5, comprising FIGS. 5A and 5B, is a series of images depicting immunoblot analysis of heat shock proteins and chaperones. Protein lysates from the undifferentiated (U) and differentiated (D) adipose-derived adult stem cells obtained from two individual donors were detected using antibodies than bind heat shock proteins and chaperones. The average signal intensity ratio (D/U) of the differentiated to undifferentiated cell lysates is indicated.



FIG. 6 is an image depicting the immunoblot detection of Heat Shock Protein 27 phosphoserine 82. Protein lysates from the undifferentiated (U) and differentiated (D) adipose-derived adult stem cells from four individual donors were detected using antibodies to heat shock protein 27 phosphoserine 82 and all isoforms of heat shock protein 27. The average signal intensity ratio (D/U) of the differentiated to undifferentiated cell lysates is indicated.



FIG. 7 is an image depicting the immunoblot detection of Crystallin alpha phosphoproteins. Protein lysates from the undifferentiated (U) and differentiated (D) adipose-derived adult stem cells from four individual donors were detected using antibodies to crystalline alpha β (heat shock protein beta) phosphoserines 19, 45, and 59. The average signal intensity ratio (D/U) of the differentiated to undifferentiated cell lysates is indicated.



FIG. 8, comprising FIGS. 8A through 8J, is a table depicting the protein features of undifferentiated human adipose-derived adult stem cells.



FIG. 9, comprising FIGS. 9A through 9C, is a table depicting proteins that are upregulated ≧2-fold with adipogenesis in human adipose-derived adult stem cells.



FIG. 10 is a table depicting proteins that are downregulated ≧3-fold with adipogenesis in human adipose-derived adult stem cells.



FIG. 11, comprising FIGS. 11A through 11C, is a table depicting proteins identified in undifferentiated and differentiated human adipose-derived adult stem cells.



FIG. 12, comprising FIGS. 12A through 12D, is a table depicting secreted proteins identified in undifferentiated and differentiated human adipose-derived adult stem cells.



FIG. 13, comprising FIGS. 13A through 13X, is a series of images depicting protein features from two-dimensional gels prepared with protein lysates from undifferentiated and differentiated human adipose-derived adult stem cells. FIGS. 13A through 13H depict undifferentiated, and FIGS. 121 through 13P depict differentiated adipose-derived adult stem cells. The SSP numbers identify the following proteins: 3705, pregnancy zone protein precursor; 3208, adiponectin precursor; 1301, calumenin precursor; 4202, heat shock protein 27 (beta 1); 5301, pigment epithelial derived factor precursor (serpin); 5302, pigment epithelial derived factor; 3203, placental thrombin inhibitor (serpin 6); and 7302, plasminogen activator inhibitor I PAI-1. The arrows indicate the location of the protein features. FIGS. 13P through 13X are a series of bar graphs indicating the relative abundance of the spot on the gels from undifferentiated cells (first four bars) versus differentiated (last four bars) adipose-derived adult stem cells.



FIG. 14, comprising FIGS. 14A through 14C, is a series of images depicting two-dimensional polyacrylamide gel electrophoresis of adipose-derived adult stem cells. FIG. 14B depicts gel electrophoresis results from undifferentiated adipose-derived adult stem cells, FIG. 14C depicts gel electrophoresis results from differentiated adipose-derived adult stem cells, and FIG. 14A depicts a master composite of the gels from the two conditions, prepared based on features conserved on replicate gels prepared from protein extracts obtained from the donors.



FIG. 15, comprising FIGS. 15A through 15E, is a series of graphs depicting quantitative real time PCR results for various secreted proteins from undifferentiated and differentiated adipose-derived adult stem cells. FIG. 15A is a graph depicting quantitative real time PCR results from protease C1 inhibitor normalized to cyclophilin B for undifferentiated and differentiated human adipose-derived adult stem cells from individual donors. Values are the mean±S.D. for triplicate determinations for each donor sample. FIG. 15B is a graph depicting quantitative real time PCR results from plasminogen activator inhibitor-1 (PAI-1) normalized to cyclophilin B for undifferentiated and differentiated human adipose-derived adult stem cells from individual donors. Values are the mean±S.D. for triplicate determinations for each donor sample. FIG. 15C is a graph depicting quantitative real time PCR results from pigmented epithelial derived factor (PEDF) normalized to cyclophilin B for undifferentiated and differentiated human adipose-derived adult stem cells from individual donors. Values are the mean±S.D. for triplicate determinations for each donor sample. FIG. 15D is a graph depicting quantitative real time PCR results from crystallin αB normalized to cyclophilin B for undifferentiated and differentiated human adipose-derived adult stem cells from individual donors. Values are the mean±S.D. for triplicate determinations for each donor sample. FIG. 15E is a graph depicting quantitative real time PCR results from heat shock protein 27 normalized to cyclophilin B for undifferentiated and differentiated human adipose-derived adult stem cells from individual donors. Values are the mean±S.D. for triplicate determinations for each donor sample.


Claims
  • 1. A method of identifying a differentiated adipose-derived adult stem cell, said method comprising comparing a proteomic profile of a first adipose-derived adult stem cell to a proteomic profile of a second adipose-derived adult stem cell, wherein said proteomic profile of said first adipose-derived adult stem cell comprises a protein that is specific for said first adipose-derived adult stem cell and is not upregulated in the proteomic profile of said second adipose-derived adult stem cell, thereby identifying a differentiated adipose-derived adult stem cell.
  • 2. The method of claim 1, wherein said adipose-derived adult stem cell is a human adipose-derived adult stem cell.
  • 3. The method of claim 1, wherein said protein is selected from the group consisting of a metabolism-related protein, a heat shock protein, a redox protein, a cytoskeletal protein, a serine protease inhibitor protein, and a protein degradation-related protein.
  • 4. The method of claim 1 wherein said proteomic profile comprises at least two proteins specific for said differentiated adipose-derived adult stem cell.
  • 5. The method of claim 1, wherein said protein specific for said differentiated adipose-derived adult stem cell is upregulated about 2-fold compared to said second adipose-derived adult stem cell.
  • 6. The method of claim 5, wherein said protein is selected from the group consisting of fatty acid binding protein-adipocyte, heat shock protein 20-like protein, heat shock protein β, heat shock protein 20, heat shock protein 27, heat shock protein 60, plasminogen activator inhibitor-1, pigmented epidermal derived factor, placental thrombin inhibitor, pregnancy zone protein, and protease C1 inhibitor.
  • 7. A method of identifying a differentiated adipose-derived adult stem cell, said method comprising comparing a proteomic profile of a first adipose-derived adult stem cell to a proteomic profile of a second adipose-derived adult stem cell, wherein said proteomic profile of said first adipose-derived adult stem cell comprises a protein that is specific for said first adipose-derived adult stem cell and is not downregulated in the proteomic profile of said second adipose-derived adult stem cell, thereby identifying a differentiated adipose-derived adult stem cell.
  • 8. The method of claim 7, wherein said adipose-derived adult stem cell is a human adipose-derived adult stem cell.
  • 9. The method of claim 7, wherein said protein is selected from the group consisting of a metabolism-related protein, a heat shock protein, a redox protein, a cytoskeletal protein, a serine protease inhibitor protein, and a protein degradation-related protein.
  • 10. The method of claim 7 wherein said proteomic profile comprises at least two proteins specific for said differentiated adipose-derived adult stem cell.
  • 11. The method of claim 7, wherein said protein is selected from the group consisting of stathmin, elfin, LIM, and SH3 domain protein 1.
  • 12. A method of distinguishing an undifferentiated adipose-derived adult stem cell from an differentiated adipose-derived adult stem cell, said method comprising comparing a proteomic profile of said undifferentiated adipose-derived adult stem cell to a proteomic profile of a differentiated adipose-derived adult stem cell, wherein said proteomic profile of said differentiated adipose-derived adult stem cell comprises a protein that is specific for said differentiated adipose-derived adult stem cell, further wherein said undifferentiated adipose-derived adult stem cell does not detectably express said protein that is specific for said differentiated adipose-derived adult stem, thereby distinguishing an undifferentiated adipose-derived adult stem cell from a differentiated adipose-derived adult stem cell.
  • 13. The method of claim 12, wherein said adipose-derived adult stem cell is a human adipose-derived adult stem cell.
  • 14. The method of claim 12, wherein said protein is selected from the group consisting of a metabolism-related protein, a heat shock protein, a redox protein, a cytoskeletal protein, a serine protease inhibitor protein, and a protein degradation-related protein.
  • 15. The method of claim 12, wherein said proteomic profile comprises at least two proteins specific for said differentiated adipose-derived adult stem cell.
  • 16. The method of claim 12, wherein said protein specific for said differentiated adipose-derived adult stem cell is upregulated about 2-fold compared to said undifferentiated adipose-derived adult stem cell.
  • 17. The method of claim 12, wherein said protein is selected from the group consisting of fatty acid binding protein-adipocyte, heat shock protein 20-like protein, heat shock protein β, heat shock protein 20, heat shock protein 27, heat shock protein 60, plasminogen activator inhibitor-1, pigmented epidermal derived factor, placental thrombin inhibitor, pregnancy zone protein, and protease C1 inhibitor.
  • 18. A method of selecting an adipose-derived adult stem cell from a population of adipose-derived adult stem cells, said method comprising comparing a proteomic profile of said adipose-derived adult stem cell to a proteomic profile of said population of adipose-derived adult stem cells, wherein said proteomic profile of said adipose-derived adult stem cell comprises a protein that is specific for said adipose-derived adult stem cell and is not upregulated in said proteomic profile of said population of adipose-derived adult stem cells, thereby selecting an adipose-derived adult stem cell from a population of adipose-derived adult stem cells.
  • 19. The method of claim 18, wherein said adipose-derived adult stem cell is a human adipose-derived adult stem cell.
  • 20. The method of claim 18, wherein said protein is selected from the group consisting of a metabolism-related protein, a heat shock protein, a redox protein, a cytoskeletal protein, a serine protease inhibitor protein, and a protein degradation-related protein.
  • 21. The method of claim 18, wherein said proteomic profile comprises at least two proteins specific for said adipose-derived adult stem cell.
  • 22. The method of claim 18, wherein said protein specific for said adipose-derived adult stem cell is upregulated about 2-fold compared to said population of adipose-derived adult stem cells.
  • 23. The method of claim 22, wherein said protein is selected from the group consisting of fatty acid binding protein-adipocyte, heat shock protein 20-like protein, heat shock protein β, heat shock protein 20, heat shock protein 27, heat shock protein 60, plasminogen activator inhibitor-1, pigmented epidermal derived factor, placental thrombin inhibitor, pregnancy zone protein, and protease C1 inhibitor.
  • 24. A method of identifying a compound that differentiates an adipose-derived adult stem cell, said method comprising contacting said adipose-derived adult stem cell with said compound, comparing a proteomic profile of said adipose-derived adult stem cell so contacted to a proteomic profile of an adipose-derived adult stem cell not contacted with said compound, wherein said proteomic profile of said adipose-derived adult stem cell so contacted comprises a protein that is specific for a differentiated adipose-derived adult stem cell and is not upregulated in said adipose-derived adult stem cell not contacted with said compound, thereby identifying a compound that differentiates an adipose-derived adult stem cell.
  • 25. The method of claim 24, wherein said adipose-derived adult stem cell is a human adipose-derived adult stem cell.
  • 26. The method of claim 24, wherein said protein is selected from the group consisting of a metabolism-related protein, a heat shock protein, a redox protein, a cytoskeletal protein, a serine protease inhibitor protein, and a protein degradation-related protein.
  • 27. The method of claim 24, wherein said proteomic profile comprises at least two proteins specific for said differentiated adipose-derived adult stem cell.
  • 28. The method of claim 24, wherein said protein specific for said differentiated adipose-derived adult stem cell is upregulated.
  • 29. The method of claim 28, wherein said protein is selected from the group consisting of fatty acid binding protein-adipocyte, heat shock protein 20-like protein, heat shock protein β, heat shock protein 20, heat shock protein 27, heat shock protein 60, plasminogen activator inhibitor-1, pigmented epidermal derived factor, placental thrombin inhibitor, pregnancy zone protein, and protease C1 inhibitor.
  • 30. A compound identified by the method of claim 24.