Related Experiment Video

Updated: Jun 8, 2026

Effect of Anti-c-fms Antibody on Osteoclast Formation and Proliferation of Osteoclast Precursor In Vitro
07:51

Effect of Anti-c-fms Antibody on Osteoclast Formation and Proliferation of Osteoclast Precursor In Vitro

Published on: March 18, 2019

Gymnasterkoreayne F inhibits osteoclast formation by suppressing NFATc1 and DC-STAMP expression

Hyun-Ju Kim1, JungMin Hong, Ji-Won Jung

  • 1Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Jung-gu, Daegu, Republic of Korea. biohjk@knu.ac.kr

International Immunopharmacology
|September 14, 2010
PubMed

Insights

Gymnasterkoreayne F (GK-F), a natural compound, effectively inhibits osteoclast differentiation and bone resorption. This compound suppresses key factors like NFATc1, crucial for treating bone-destructive diseases.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Osteoclasts are critical for bone remodeling, but their overactivity drives diseases like osteoporosis and rheumatoid arthritis.
  • Targeting osteoclast formation and function is a key therapeutic strategy for bone resorption disorders.

Purpose of the Study:

  • To investigate the effects of Gymnasterkoreayne F (GK-F), a natural compound from Gymnaster koraiensis, on osteoclast differentiation and function.
  • To elucidate the molecular mechanisms underlying GK-F's action on osteoclasts.

Main Methods:

  • Osteoclast differentiation was induced from bone marrow-derived macrophages (BMMs) in vitro.
  • Quantitative analysis of osteoclast markers (NFATc1, Cathepsin K, TRAP, DC-STAMP, β3 integrin) was performed.
  • Inhibition of pre-osteoclast fusion and bone resorptive activity was assessed.
  • RANKL, LPS, and TNF-α were used as inducers for osteoclastogenesis and fusion.

Main Results:

  • GK-F dose-dependently inhibited osteoclast differentiation from BMMs.
  • GK-F suppressed the expression of NFATc1, Cathepsin K, and TRAP, key regulators of osteoclastogenesis.
  • GK-F abolished osteoclast fusion induced by RANKL, LPS, and TNF-α by downregulating DC-STAMP.
  • GK-F inhibited bone resorption activity by blocking RANKL-induced actin ring formation and decreasing β3 integrin expression.

Conclusions:

  • GK-F demonstrates potent inhibitory effects on osteoclast differentiation, fusion, and bone resorption.
  • The mechanism involves the suppression of NFATc1 and its downstream targets, as well as interference with osteoclast fusion and cytoskeletal organization.
  • GK-F shows potential as a therapeutic agent for managing bone resorption-related diseases.

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...
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
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...
NF-kB-dependent Signaling Pathway02:26

NF-kB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...