Human Thrombopoietin/Tpo Antibody

(2 citations)   
  • Species Reactivity
    Human
  • Specificity
    Detects human Tpo in direct ELISAs and Western blots. In direct ELISAs, less than 10% cross-reactivity with recombinant mouse Tpo and recombinant rat Tpo is observed.
  • Source
    Polyclonal Goat IgG
  • Purification
    Antigen Affinity-purified
  • Immunogen
    S. frugiperda insect ovarian cell line Sf 21-derived recombinant human Tpo
    Ser22-Gly353
    Accession # P40225
  • Formulation
    Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
  • Endotoxin Level
    <0.10 EU per 1 μg of the antibody by the LAL method.
  • Label
    Unconjugated
Applications
  •  
    Recommended
    Concentration
    Sample
  • Western Blot
    0.1 µg/mL
    Recombinant Human Thrombopoietin/Tpo (Catalog # 288-TP)
  • Neutralization
    Measured by its ability to neutralize Thrombopoietin/Tpo-induced proliferation in the MO7e human megakaryocytic leukemic cell line. Avanzi, G. et al. (1988) Br. J. Haematol. 69:359. The Neutralization Dose (ND50) is typically 0.05-0.3 µg/mL in the presence of 3 ng/mL Recombinant Human Thrombopoietin/Tpo.
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Data Examples
Cell Proliferation Induced by Thrombopoietin and Neutralization by Human Thrombopoietin Antibody. Recombinant Human Thrombopoietin/Tpo (Catalog # 288-TP) stimulates proliferation in the MO7e human mega­karyocytic leukemic cell line in a dose-dependent manner (orange line). Proliferation elicited by Recombinant Human Thrombopoietin/Tpo (3 ng/mL) is neutralized (green line) by increasing concentrations of Human Thrombopoietin/Tpo Antigen Affinity-purified Polyclonal Antibody (Catalog # AF-288-NA). The ND50 is typically 0.05-0.3 µg/mL.
Preparation and Storage
  • Reconstitution
    Reconstitute at 0.2 mg/mL in sterile PBS.
  • Shipping
    The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
  • Stability & Storage
    Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
    • 12 months from date of receipt, -20 to -70 °C as supplied.
    • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
    • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Background: Thrombopoietin/Tpo

Thrombopoietin (Tpo), is a key regulator of megakaryocytopoiesis and thrombopoiesis. It is principally produced in the liver and is bound and internalized by the receptor Tpo R/c-mpl. Defects in the Tpo-Tpo R signaling pathway are associated with a variety of platelet disorders (1 - 3). The 353 amino acid (aa) human Tpo precursor is cleaved to yield the 332 aa mature protein. Mature human Tpo shares approximately 70% aa sequence homology with mouse and rat Tpo. It is an 80 - 85 kDa protein that consists of an N-terminal domain with homology to Erythropoietin (Epo) and a C-terminal domain that contains multiple N-linked and O-linked glycosylation sites (4, 5). Tissue specific alternate splicing of human Tpo generates multiple isoforms with internal deletions, insertions, and/or C-terminal substitutions (6). Tpo promotes the differentiation, proliferation, and maturation of MK and their progenitors (4, 5, 7). Several other cytokines can promote these functions as well but only in cooperation with Tpo (8, 9). Notably, IL-3 independently induces MK development, although its effects are restricted to early in the MK lineage (8, 9). Tpo additionally promotes platelet production, aggregation, ECM adhesion, and activation (10, 13). It is cleaved by platelet-derived thrombin following Arg191 within the C-terminal domain and subsequently at other sites upon extended digestion (14). Full length Tpo and shorter forms circulate in the plasma (4, 5). TheC-terminal domain is not required for binding to Tpo R or inducing MK growth and differentiation (5). Aside from its hematopoietic effects, Tpo is expressed in the brain where it promotes the apoptosis of hypoxia-sensitized neurons and inhibits neuronal differentiation by blocking NGF induced signaling (15, 16).

  • References:
    1. Deutsch, V.R. and A. Tomer (2006) Br. J. Haematol. 134:453.
    2. Kaushansky, K. (2005) J. Clin. Invest. 115:3339.
    3. Li, J. et al. (1999) Br. J. Haematol. 106:345.
    4. Bartley, T.D. et al. (1994) Cell 77:1117.
    5. de Sauvage, F.J. et al. (1994) Nature 369:533.
    6. Marcucci, R. and M. Romano (2008) Biochim. Biophys. Acta 1782:427.
    7. Kaushansky, K. et al. (1994) Nature 369:568.
    8. Kaushansky, K. et al. (1995) Proc. Natl. Acad. Sci. 92:3234.
    9. Broudy, V.C. et al. (1995), Blood 85:1719.
    10. Lok, S.I. et al. (1994) Nature 369:565.
    11. Chen, J. et al. (1995) Blood 86:4054.
    12. Oda, A. et al. (1996) Blood 87:4664.
    13. Van Os, E. et al. (2003) Br. J. Haematol. 121:482.
    14. Kato, T. et al. (1997) Proc. Natl. Acad. Sci. 94:4669.
    15. Ehrenreich, H. et al. (2005) Proc. Natl. Acad. Sci. 102:862.
    16. Samoylenko, A. et al. (2008) Cell. Signal. 20:154.
  • Entrez Gene IDs:
    7066 (Human); 21832 (Mouse); 81811 (Rat)
  • Alternate Names:
    Megakaryocyte colony-stimulating factor; Megakaryocyte growth and development factor; megakaryocyte stimulating factor; MGDF; MGDFC-mpl ligand; MK-CSF; ML; MPL ligand; MPLLGMGC163194; Myeloproliferative leukemia virus oncogene ligand; THPO; thrombopoietin nirs variant 1; Thrombopoietin; Tpo; TPOMKCSF
Related Research Areas
Citations:

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

2 Citations: Showing 1 - 2
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Species
Applications
Sample Type
  1. Oncostatin M stimulates proliferation, induces collagen production and inhibits apoptosis of human lung fibroblasts.
    Authors: Scaffidi AK, Mutsaers SE, Moodley YP, McAnulty RJ, Laurent GJ, Thompson PJ, Knight DA
    Br. J. Pharmacol., 2002;136(5):793-801.
    Species: Human
    Sample Type: Whole Cells
    Application: Neut
  2. CD40-ligand stimulates myelopoiesis by regulating flt3-ligand and thrombopoietin production in bone marrow stromal cells.
    Authors: Solanilla A, Dechanet J, El Andaloussi A, Dupouy M, Godard F, Chabrol J, Charbord P, Reiffers J, Nurden AT, Weksler B, Moreau JF, Ripoche J
    Blood, 2000;95(12):3758-64.
    Species: Human
    Sample Type: Cell Lysates
    Application: WB
Isotype Controls
Description Application Cat# Citations Images  

Normal Goat IgG Control

Ctrl AB-108-C 191  
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Secondary Antibodies
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Goat IgG HRP-conjugated Antibody

WB, Simple Western HAF109 19  
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Goat IgG HRP-conjugated Antibody

WB HAF017 15  
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Goat IgG (H+L) PE-conjugated Antibody

Flow F0107 4  
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Donkey Anti-Goat IgG NorthernLights™ NL557-conjugated Antibody

Flow, IHC, ICC NL001 9
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Donkey Anti-Goat IgG NorthernLights™ NL493-conjugated Antibody

Flow, IHC, ICC NL003 5
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Goat IgG (H+L) APC-conjugated Antibody

Flow F0108 6  
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Goat IgG Horseradish Peroxidase-conjugated Antibody

WB HAF019 6  
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Donkey Anti-Goat IgG Antibody

WB AF109 6
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Donkey Anti-Goat IgG Biotinylated Antibody

WB BAF109 3
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Goat IgG VisUCyte HRP Polymer

IHC VC004  
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Goat IgG (H+L) Fluorescein-conjugated Antibody

Flow F0109 2  
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Donkey Anti-Goat IgG NorthernLights™ NL637-conjugated Antibody

Flow, IHC, ICC NL002
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Rabbit Anti-Goat IgG (H+L) Affinity Purified PAb, X Absorbed

WB, ELISA R-401-C-ABS
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Chicken Anti-Goat IgG Biotinylated Antibody

WB BAF019
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Rabbit Anti-Goat IgG Biotinylated Antibody

WB BAF017
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Donkey Anti-Goat IgG (H+L) PerCP-conjugated Antibody

Flow F0124
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