Osteoprotegerin (OPG), also known as osteoclastogenesis inhibitory factor (OCIF) or tumour necrosis factor receptor superfamily member 11B (TNFRSF11B), is a cytokine receptor of the tumour necrosis factor (TNF) receptor superfamily encoded by the TNFRSF11B gene. OPG was first discovered as a novel secreted TNFR related protein that played a role in the regulation of bone density and later for its role as a decoy receptor for receptor activator of nuclear factor kappa-B ligand (RANKL). OPG also binds to TNF-related apoptosis-inducing ligand (TRAIL) and inhibits TRAIL induced apoptosis of specific cells, including tumour cells. Other OPG ligands include syndecan-1, glycosaminoglycans, von Willebrand factor, and factor VIII-von Willebrand factor complex. OPG has been identified as having a role in tumour growth and metastasis, heart disease, immune system development and signalling, mental health, diabetes, and the prevention of pre-eclampsia and osteoporosis during pregnancy.
Background References
1. Dutka M et al. Osteoprotegerin and RANKL-RANK-OPG-TRAIL signalling axis in heart failure and other cardiovascular diseases. Heart Fail Rev. 2022 Jul
2. Xu M et al. Association between Osteoprotegerin rs2073618 polymorphism and peri-implantitis susceptibility: a meta-analysis. BMC Oral Health. 2022 Dec
Western blot analysis of Osteoprotegerin on different lysates with Rabbit anti-Osteoprotegerin antibody (HA724629) at 1/5,000 dilution.
Lane 1: K-562 (Human chronic myelogenous leukemia cell) cell lysate
Lane 2: Mouse liver tissue lysate
Lane 3: Mouse kidney tissue lysate
Lane 4: Mouse skeletal muscle tissue lysate
Lane 5: Rat liver tissue lysate
Lane 6: Rat kidney tissue lysate
Lane 7: Rat skeletal muscle tissue lysate
Lysates/proteins at 20 µg/Lane.
Exposure time: 3 minutes; ECL: K1801
Negative expression of Osteoprotegerin/TNFRSF11B protein in skeletal muscle is consistent with the predicted expression pattern.
Blocking: 5% NFDM/TBST, 1 hour at room temperature
Primary antibody: HA724629, 1/5,000 in primary antibody dilution buffer (K1803), overnight at 4 °C
Secondary antibody: Goat anti-Rabbit IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 46 kDa
Observed band size: 56 kDa
Application: Immunohistochemistry (IHC-P)
Species: Rat
Tissue: Kidney
Sample: Paraffin-embedded section