Métabolisme osseux

Osteoprotegerin

Serum, plasma

Centrifuge freshly collected blood as soon as possible
Samples can be stored for a maximum of 24 hours at 4 °C before centrifugation.
Store centrifuged samples at -20 °C for longer storage.
OPG is stable up to 4 freeze and thaw cycles.
Hemolyzed or lipemic samples may cause erroneous results.

Median = 2.7 pmol/l (n = 60)

Human

Osteoprotegerin (OPG) is a secretory glycoprotein belonging to the TNF receptor super family 11b.
It has inhibition effects on osteoclast and is therefore essential for bone formation.
OPG inhibits the binding of RANK to RANKL and thus inhibits the recruitment, proliferation and activation of osteoclasts. OPG is synthesized as a monomer of 380 amino acids and is assembled as a homodimer within the cell, and then secreted mainly as a disulfide-linked homodimer into the extracellular compartment. OPG is produced by many different tissues and cell types including osteoblasts. OPG is a negative regulator of bone resorption by acting as decoy receptor for RANKL, thus neutralizing its function in osteoclastogenesis.
This glycoprotein is also involved in the regulation of vascular calcification.
Changes in the homeostasis of the RANKL/RANK/OPG systems causes disturbances in bone remodeling shown by bone damages in patients with postmenopausal osteoporosis, Paget’s disease, bone loss due to cancer metastases and rheumatoid arthritis.

Intended applications:

Osteoporosis
Diseases with locally increased resorption activity
Therapy monitoring
Arthritis
Cardiovascular Disease