Related Experiment Video

Updated: Sep 11, 2025

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
08:42

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Published on: July 3, 2020

4.6K

Tgif1-deficiency impairs osteoclast differentiation through PP2A-mediated ERK1/2 dephosphorylation and attenuates

Miki Maeda1, Hiroaki Saito1,2,3, Amy B P Ribet2,3

  • 1Molecular Skeletal Biology Laboratory, Department of Orthopedics and Trauma Surgery, University Medical Center Hamburg-Eppendorf, D-20251 Hamburg, Germany.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|August 14, 2025
PubMed

Insights

TG-interacting factor 1 (Tgif1) is crucial for osteoclast function. Deleting Tgif1 impairs bone resorption and reduces bone loss, revealing its role in maintaining bone mass.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Bone Biology

Background:

  • Bone remodeling relies on osteoclasts and osteoblasts; imbalances cause osteoporosis.
  • TG-interacting factor 1 (Tgif1) is known to regulate osteoblast function.

Purpose of the Study:

  • To investigate the cell-autonomous role of Tgif1 in osteoclasts.
  • To understand Tgif1's impact on osteoclast differentiation and function.

Main Methods:

  • Examined Tgif1 expression during osteoclast differentiation.
  • Utilized genetic deletion of Tgif1 in osteoclast lineage in mice.
  • Investigated the molecular mechanism involving ERK1/2 and protein phosphatase 2A (PP2A).

Main Results:

  • Tgif1 expression increases during osteoclast differentiation.
  • Osteoclast-specific Tgif1 deletion impairs differentiation and bone resorption.
  • Tgif1 deficiency reduces aging-related bone loss in mice.
  • Tgif1 suppresses PP2A, a key ERK1/2 phosphatase.
  • PP2A inhibition rescues Tgif1-deficient osteoclast differentiation.

Conclusions:

  • Tgif1 is a critical regulator of osteoclast differentiation and function.
  • Tgif1 plays a cell-autonomous role in controlling bone resorption.
  • Tgif1's mechanism involves regulating PP2A activity.
  • Tgif1 represents a potential therapeutic target for bone loss disorders.
Keywords:
ERK1/2PP2ATgif1bone resorptionosteoclast

More Related Videos

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro07:03

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

Published on: June 16, 2022

6.5K
A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders11:47

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

Published on: June 8, 2014

11.8K

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...
3.2K
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...
7.6K
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.
38.5K
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...
2.9K
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
4.0K