Human IBSP/Sialoprotein II Antibody

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Product Details
Citations (3)
Supplemental Products

Human IBSP/Sialoprotein II Antibody Summary

Species Reactivity
Detects human IBSP/Sialoprotein II in direct ELISAs and Western blots.
Polyclonal Goat IgG
Antigen Affinity-purified
Chinese hamster ovary cell line CHO-derived recombinant human IBSP/Sialoprotein II
Accession # AAC95490
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.


Recommended Concentration
Western Blot
0.1 µg/mL
Recombinant Human IBSP/Sialoprotein II (Catalog # 4014-SP)

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.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Preparation and Storage

Reconstitute at 0.2 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Size / Price
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: IBSP/Sialoprotein II

IBSP (integrin-binding sialoprotein; also BSP or bone sialoprotein (II)) is a 55‑75 kDa, secreted, variably glycosylated, monomeric noncollagenous member of the SIBLING family of extracellular matrix (ECM) proteins (1‑3). It is principally associated with the early stages of bone mineralization. BSP is synthesized as a 317 amino acid (aa) precursor that contains a 16 aa signal sequence and a 301 aa mature region (4‑6). The mature segment is divided into a basic N-terminus (aa 17‑62), a central region (aa 63‑233), and an acidic C‑terminus (aa 234‑317) (7).

Functional segments associated with the mature molecule include a type I collagen binding domain (aa 19‑46), two non‑RGD cell binding sites (aa 30‑57 and 261‑281), an RGD alpha v beta 3 integrin‑binding site (aa 286‑288) and two potential hydroxyapatite (HAp) nucleation domains (aa 76‑83 and 151‑158) (3, 4, 8‑11). HAp formation requires a BSP nucleation site composed of at least eight consecutive glutamic acid residues and, likely, a contribution from a BSP‑associated co‑nucleator (10, 12). BSP is highly glycosylated, sulfated, and phosphorylated. Phosphorylation may impact HAp growth, while carbohydrate may regulate cell adhesion (1, 3, 13). Mature human BSP is 70%, 72%, 78%, and 72% aa identical to porcine, rat, canine, and mouse BSP, respectively. BSP is synthesized by megakaryocytes/platelets, osteoblasts, osteocytes, odontoblasts, osteoclasts, and bone marrow stromal cells (14‑17).

  1. Qin, C. et al. (2004) Crit. Rev. Oral Biol. Med. 15:126.
  2. Alford, A.I. and K.D. Hankenson (2006) Bone 38:749.
  3. Ganss, B. et al. (1999) Crit. Rev. Oral Biol. Med. 10:79.
  4. Fisher, L.W. et al. (1990) J. Biol. Chem. 265:2347.
  5. Kerr, J.M. et al. (1993) Genomics 17:408.
  6. Kim, R.H. et al. (1994) Matrix Biol. 14:31.
  7. Zaia, J. et al. (2001) Biochemistry 40:12983.
  8. Tye, C.E. et al. (2005) J. Biol. Chem. 280:13487.
  9. Stubbs, J.T. et al. (1997) J. Bone Miner. Res. 12:1210.
  10. Tye, C.E. et al. (2003) J. Biol. Chem. 278:7949.
  11. Miyauchi, A. et al. (1991) J. Biol. Chem. 266:20369.
  12. Hakki, S.S. et al. (2006) J. Periodontol. 77:167.
  13. Wazen, R.M. et al. (2007) J. Histochem. Cytochem. 55:35.
  14. Kacena, M.A. et al. (2006) Bone 39:978.
  15. Bianco, P. et al. (1991) Calcif. Tissue Int. 49:421.
  16. Chen, J. et al. (1992) J. Bone Miner. Res. 7:987.
  17. Kreke, M.R. et al. (2005) Bone 36:1047.
Long Name
Integrin-binding Sialoprotein
Entrez Gene IDs
3381 (Human); 15891 (Mouse); 24477 (Rat)
Alternate Names
BNSP; Bone sialoprotein 2; Bone sialoprotein; BSP 2; BSP II; BSP; BSP2; BSPII; BSP-II; Cell binding sialoprotein; IBSP; Integrin binding sialoprotein; SP II; SPII; SP-II

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Citations for Human IBSP/Sialoprotein II Antibody

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.

3 Citations: Showing 1 - 3
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  1. VCAM-1 Targeted Lipopolyplexes as Vehicles for Efficient Delivery of shRNA-Runx2 to Osteoblast-Differentiated Valvular Interstitial Cells; Implications in Calcific Valve Disease Treatment
    Authors: G Voicu, D Rebleanu, CA Mocanu, G Tanko, I Droc, CM Uritu, M Pinteala, I Manduteanu, M Simionescu, M Calin
    International Journal of Molecular Sciences, 2022-03-30;23(7):.
    Species: Human
    Sample Types: Cell Lysates
    Applications: Western Blot
  2. Exosomal miR-19a and IBSP cooperate to induce osteolytic bone metastasis of estrogen receptor-positive breast cancer
    Authors: K Wu, J Feng, F Lyu, F Xing, S Sharma, Y Liu, SY Wu, D Zhao, A Tyagi, RP Deshpande, X Pei, MG Ruiz, H Takahashi, S Tsuzuki, T Kimura, YY Mo, Y Shiozawa, R Singh, K Watabe
    Nature Communications, 2021-08-31;12(1):5196.
    Species: Human
    Sample Types:
    Applications: Binding Assay
  3. Nano-Polyplexes Mediated Transfection of Runx2-shRNA Mitigates the Osteodifferentiation of Human Valvular Interstitial Cells
    Authors: G Voicu, D Rebleanu, CA Constantin, EV Fuior, L Ciortan, I Droc, CM Uritu, M Pinteala, I Manduteanu, M Simionescu, M Calin
    Pharmaceutics, 2020-06-02;12(6):.
    Species: Human
    Sample Types: Cell Lysates
    Applications: Western Blot


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Isotype Controls

Reconstitution Buffers

Secondary Antibodies

Goat IgG (H+L) Antibody


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