Related Experiment Videos

[Osteoclastogenesis Inhibitory Factor (OCIF) /Osteoprotegerin (OPG) as a new therapeutic agent for osteoporosis]

Shin-ichi Mochizuki1, Akiko Kiyokawa, Yuki Nagayama

  • 1Biological Research Laboratories, Sankyo Co., Ltd., Japan.

Clinical Calcium
|January 6, 2005
PubMed

Insights

Osteoclastogenesis inhibitory factor (OCIF), also known as Osteoprotegerin (OPG), acts as a decoy receptor to inhibit osteoclast differentiation. This discovery offers potential therapeutic strategies for metabolic bone diseases.

Area of Science:

  • Molecular Biology
  • Immunology
  • Endocrinology

Context:

  • Osteoclastogenesis inhibitory factor (OCIF) is identified as Osteoprotegerin (OPG).
  • OPG functions as a soluble decoy receptor within the Tumor Necrosis Factor Receptor superfamily.
  • It plays a critical role in regulating bone metabolism.

Purpose:

  • To elucidate the mechanism of OCIF/OPG in osteoclastogenesis.
  • To explore the role of the OCIF/OPG-RANKL system in metabolic bone diseases.

Summary:

  • OCIF/OPG binds to Receptor Activator of NF-kappa B Ligand (RANKL), a key molecule in osteoblast-osteoclast signaling.
  • This interaction suppresses the differentiation of osteoclastic progenitor cells into mature osteoclasts.
  • Cytokines and hormones modulate the balance between OCIF/OPG and RANKL.

Impact:

  • Understanding the OCIF/OPG-RANKL system provides insights into the pathogenesis of human metabolic bone diseases.
  • OCIF/OPG emerges as a promising therapeutic candidate for treating metabolic bone disorders.

Related Concept Videos

Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Bone Remodeling01:40

Bone Remodeling

Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
Role of Vitamins in Maintaining Bone Health01:25

Role of Vitamins in Maintaining Bone Health

The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...