Osteonectin / SPARC Protein (His Tag)

• Description:

  Secreted protein acidic and rich in cysteine (SPARC), also known as Osteonectin (ON), is a member of the SPARC family. SPARC consists of three domains: an EF-hand domain, a follistatin-like domain and a Kazal-like domain, and each of which has independent activity and unique properties. The activity of SPARC is context- and cell-type-dependent, which is highlighted by the fact that SPARC has shown seemingly contradictory effects on tumor progression in both clinical correlative studies and in animal models. The location of SPARC in the nuclear matrix of certain proliferating cells, but only in the cytosol of postmitotic neurons, indicates potential functions of SPARC as a nuclear protein, which might be involved in the regulation of cell cycle progression and mitosis. It functions not only to modulate cell-cell and cell-matrix interactions, but its de-adhesive and growth inhibitory properties in non-transformed cells have led to studies to assess its role in cancer. Its divergent actions reflect the complexity of this protein, because in certain types of cancers, such as melanomas and gliomas, SPARC is associated with a highly aggressive tumor phenotype, while in others, mainly ovarian, neuroblastomas and colorectal cancers, SPARC may function as a tumor suppressor. Recent studies have also demonstrated a role for SPARC in sensitizing therapy-resistant cancers. Notably, SPARC is linked to human obesity.

• Synonyms:

  BM-40 Protein; OI17 Protein; ON Protein; ONT Protein

• Accession Number:

  NP_003109.1

• Reactivity:

  Human

• Cross Reactivity:

  Human

• Label:

  His-Tag

• Assay Protocol:

  See Datasheet send with the product

• Endotoxin:

  < 1.0 EU per μg of the protein as determined by the LAL method

• Purity:

  ≥ 95 % as determined by SDS-PAGE. ≥ 95 % as determined by SEC-HPLC.

• Bioactivity:

  Measured by its ability to inhibit the cell growth of Mv-1-Lu mink lung epithelial cells. The ED50 for this effect is typically 1.5-7.5 μg/mL.

• Length:

  297

• Form:

  Lyophilized or frozen liquid

• Buffer:

  PBS, pH 7.4

• Reconstitution:

  See Datasheet

• Molecular Weight:

  45 kDa (glycosylated)

• Storage Conditions:

  Samples are stable for up to twelve months from date of receipt at -20°C to -80°C. Store it under sterile conditions at -20°C to -80°C. It is recommended that the protein be aliquoted for optimal storage. Avoid repeated freeze-thaw cycles.

• Host or Source:

  HEK 293 cells