Human Osteopontin HEK293 Overexpression Lysate: Product Information
This Human Osteopontin overexpression lysate was created in HEK293 Cells and intented for use as a Western blot (WB) positive control. Purification of Osteopontin protein (Cat: 10352-H08H) from the overexpression lysate was verified.
A DNA sequence encoding the pro form of human SPP1 (NP_001035147.1) (Met 1-Asn 314) was fused with a polyhistidine tag at the C-terminus.
The recombinant human SPP1 consists of 309 amino acids after removal of the signal peptide and has a calculated molecular mass of 35 kDa. The apparent molecular mass of rh SPP1 is approximately 60-65 kDa in SDS-PAGE under reducing conditions due to glycosylation.
Human Osteopontin HEK293 Overexpression Lysate: Usage Guide
Cell lysate was prepared by homogenization of the over-expressed cells in ice-cold modified RIPA Lysis Buffer with cocktail of protease inhibitors (Sigma). Cell debris was removed by centrifugation. Protein concentration was determined by Bradford assay (Bio-Rad protein assay, Microplate Standard assay). The cell lysate was boiled for 5 min in 1 x SDS loading buffer (50 mM Tris-HCl pH 6.8, 12.5% glycerol, 1% sodium dodecylsulfate, 0.01% bromophenol blue) containing 5% b-mercaptoethanol, and lyophilized.
1. Centrifuge the tube for a few seconds and ensure the pellet at the bottom of the tube.
2. Re-dissolve the pellet using 200μL pure water and boil for 2-5 min.
1 X Sample Buffer (1 X modified RIPA buffer+1 X SDS loading buffer).
Stability & Storage
Store at 4℃ for up to twelve months from date of receipt. After re-dissolution, aliquot and store at -80℃ for up to twelve months. Avoid repeated freeze-thaw cycles.
Western Blot (WB) Optimal dilutions/concentrations should be determined by the end user.
Human Osteopontin HEK293 Overexpression Lysate: Synonyms
Human BNSP Overexpression Lysate; Human BSPI Overexpression Lysate; Human ETA-1 Overexpression Lysate; Human OPN Overexpression Lysate
Osteopontin Background Information
Osteopontin, also known as Secreted phosphoprotein 1, Bone sialoprotein 1, BSP-1, OPN, and SPP1, is a member of the osteopontin family and a SIBLING glycoprotein. Osteopontin has been classified as T-helper 1 cytokine and thus believed to exacerbate inflammation in several chronic inflammatory diseases, including atherosclerosis. Besides proinflammatory functions, physiologically Osteopontin is a potent inhibitor of mineralization, it prevents ectopic calcium deposits and is a potent inducible inhibitor of vascular calcification. Osteopontin is expressed and secreted by various cells, and has a role in cell adhesion, chemotaxis, prevention of apoptosis, invasion, migration and anchorage-independent growth of tumor cells. Osteopontin recruitment functions of inflammatory cells are thought to be mediated through its adhesive domains, especially the arginine-glycine-aspartate (RGD) sequence that interacts with several integrin heterodimers. Osteopontin has emerged as a potential biomarker and mediator in cardiovascular disease. In the context of atherosclerosis, OPN is generally regarded as a proinflammatory and proatherogenic molecule. However, the role of OPN in vascular calcification (VC), which is closely related to chronic and active inflammation, is that of a negative regulator because it is an inhibitor of calcification and an active inducer of decalcification. Extensive research has demonstrated the pivotal participation of Osteopontin in the regulation of cell signaling which controls neoplastic and malignant transformation. The elevated expression of Osteopontin has been observed in a variety of cancers. It has been linked with tumor metastasis and signifies a poor prognosis for the patient.
secreted phosphoprotein 1
Scatena M, et al. (2007) Osteopontin: a multifunctional molecule regulating chronic inflammation and vascular disease. Arterioscler Thromb Vasc Biol. 27(11): 2302-9.
Johnston NI, et al. (2008) Osteopontin as a target for cancer therapy. Front Biosci. 13: 4361-72.
Cho HJ, et al. (2009) Osteopontin: a multifunctional protein at the crossroads of inflammation, atherosclerosis, and vascular calcification. Curr Atheroscler Rep. 11(3): 206-13.
Waller AH, et al. (2010) Osteopontin in cardiovascular disease: a potential therapeutic target. Cardiol Rev. 18(3): 125-31.
Shevde LA, et al. (2010) Osteopontin: an effector and an effect of tumor metastasis. Curr Mol Med. 10(1): 71-81.
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