Related Experiment Video

Updated: Nov 17, 2025

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro
07:03

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro

Published on: June 16, 2022

6.8K

2-NPPA Mitigates Osteoclastogenesis via Reducing TRAF6-Mediated c-fos Expression

Zhihao Chen1, Mina Ding1, Eunjin Cho2

  • 1Department of Molecular Medicine, Chonnam National University Graduate School, Gwangju, South Korea.

Frontiers in Pharmacology
|February 12, 2021
PubMed

Insights

A novel compound, 2-(2-chlorophenoxy)-N-[2-(4-propionyl-1piperazinyl) phenyl] acetamide (2-NPPA), effectively inhibits osteoclast formation and activity. This discovery offers a promising therapeutic strategy for preventing bone loss in diseases like osteoporosis.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Bone Biology

Background:

  • Pathological bone diseases are characterized by excessive bone resorption, leading to bone destruction.
  • Osteoporosis, a global health challenge, results from an imbalance between bone resorption and synthesis.
  • Targeting osteoclast activity is crucial for preventing bone loss-related disorders.

Purpose of the Study:

  • To screen for novel compounds that regulate osteoclast activity.
  • To investigate the potential of 2-(2-chlorophenoxy)-N-[2-(4-propionyl-1piperazinyl) phenyl] acetamide (2-NPPA) in preventing bone loss.

Main Methods:

  • Compound screening for anti-osteoclastogenesis activity.
  • Analysis of osteoclast-specific marker gene and protein expression.
  • Assessment of mature osteoclast formation, F-actin ring, and bone resorption.
  • Evaluation of signaling pathways, including NF-κB phosphorylation and c-fos expression.
  • In vivo study using an ovariectomy-induced bone loss model.

Main Results:

  • 2-NPPA significantly inhibited osteoclastogenesis, suppressing osteoclast-specific markers.
  • The compound blocked mature osteoclast formation, F-actin ring development, and bone resorption activity.
  • 2-NPPA demonstrated inhibitory effects on NF-κB phosphorylation and c-fos expression in vitro.
  • In vivo, 2-NPPA effectively prevented ovariectomy-induced bone loss.

Conclusions:

  • 2-NPPA exhibits potent anti-osteoclastogenic and bone-protective effects.
  • The compound acts by inhibiting key signaling pathways involved in osteoclast differentiation and activity.
  • 2-NPPA shows significant potential as a therapeutic agent for treating bone loss disorders.
Keywords:
TRAF6acetamidebone lossc-fososteoclastogenesis

More Related Videos

Stimulation of Notch Signaling in Mouse Osteoclast Precursors08:01

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Published on: February 28, 2017

8.1K
Effect of Anti-c-fms Antibody on Osteoclast Formation and Proliferation of Osteoclast Precursor In Vitro07:51

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

Published on: March 18, 2019

6.2K

Related Concept Videos

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...
8.6K
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...
3.5K
Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.9K
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...
8.3K
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...
3.3K