Osteonectin (ON) also known as secreted protein acidic and rich in cysteine (SPARC) or basement-membrane protein 40 (BM-40) is a protein that in humans is encoded by the SPARC gene. Osteonectin is a glycoprotein in the bone that binds calcium. It is secreted by osteoblasts during bone formation, initiating mineralization and promoting mineral crystal formation. Osteonectin also shows affinity for collagen in addition to bone mineral calcium. A correlation between osteonectin over-expression and ampullary cancers and chronic pancreatitis has been found.
Background References
1. Ryu S et al. The matricellular protein SPARC induces inflammatory interferon-response in macrophages during aging. Immunity. 2022 Sep
2. Veith C et al. SPARC, a Novel Regulator of Vascular Cell Function in Pulmonary Hypertension. Circulation. 2022 Mar
Western blot analysis of SPARC on different lysates with Rabbit anti-SPARC antibody (HA722655) at 1/1,000 dilution.
Lane 1: A375 cell lysate Lane 2: SH-SY5Y cell lysate Lane 3: MG-63 cell lysate Lane 4: RWPE-1 cell lysate Lane 5: MCF7 cell lysate (negative)
Lysates/proteins at 20 µg/Lane.
Predicted band size: 35 kDa Observed band size: 35 kDa
Exposure time: 3 minutes; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA722655) at 1/1,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
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