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Related Experiment Video

Updated: Jun 12, 2026

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Published on: February 28, 2017

GPCR kinase 2 interacting protein 1 (GIT1) regulates osteoclast function and bone mass.

Prashanthi Menon¹, Guoyong Yin, Elaine M Smolock

¹Department of Medicine and Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, USA.

Journal of Cellular Physiology

|June 23, 2010

Summary

G-protein-coupled receptor kinase 2 interacting protein-1 (GIT1) deficiency increases bone mass by impairing osteoclast function. This study highlights GIT1

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Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Published on: July 3, 2020

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Last Updated: Jun 12, 2026

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Published on: February 28, 2017

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Published on: July 3, 2020

Area of Science:

Molecular and Cellular Biology
Bone Biology and Disease
Signal Transduction

Background:

G-protein-coupled receptor kinase 2 interacting protein-1 (GIT1) is a scaffold protein found in various cell types.
GIT1 knockout (KO) mice exhibit pulmonary and endothelial dysfunction.
GIT1 is tyrosine phosphorylated by Src kinase, suggesting potential roles in bone metabolism.

Purpose of the Study:

To investigate the role of GIT1 in bone mass regulation.
To determine if GIT1 deficiency impacts osteoblast and osteoclast function.
To elucidate the mechanism by which GIT1 influences bone remodeling.

Main Methods:

Microcomputed tomography (micro-CT) for bone mass analysis in GIT1 KO mice.
Histomorphometry to assess bone structure and remodeling.
Osteoblast and osteoclast differentiation and function assays (alkaline phosphatase, mineral nodule formation, dentin slice resorption, calcein labeling).
Immunoblotting and immunofluorescence for protein expression and localization.

Main Results:

GIT1 KO mice displayed a 2.3-fold increase in bone mass with altered trabecular structure.
Osteoblast activity was normal in GIT1 KO mice.
Osteoclast differentiation occurred, but resorbing function was defective due to impaired podosome belt formation.
GIT1 regulates RANK signaling and phospholipase C-γ2 phosphorylation.

Conclusions:

GIT1 is a critical regulator of bone mass in vivo.
The increased bone mass in GIT1 KO mice is primarily due to impaired osteoclast function.
GIT1's role in osteoclast podosome formation and RANK signaling suggests it as a potential therapeutic target for osteoporosis.