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Related Experiment Video

Updated: Jun 1, 2026

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

USP24-dependent STAT2 stabilization mediates physiologic and pathologic bone formation.

Jung-Min Kim¹, Yeon-Suk Yang^2,3, Jun Xie^2,4,5

¹Department of Biology, College of Sciences, Kyung Hee University, Seoul, South Korea. jungminkim@khu.ac.kr.

Cell Death & Disease

|May 30, 2026

Summary

This summary is machine-generated.

The deubiquitinating enzyme USP24 regulates osteoblast development and heterotopic ossification (HO) by stabilizing STAT2. USP24-STAT2 signaling is crucial for bone formation and may be a therapeutic target for pathological bone conditions.

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Area of Science:

Biochemistry
Cell Biology
Skeletal Biology

Background:

Precise regulation of osteoblast development is critical for skeletal health, preventing conditions like low bone mass and heterotopic ossification (HO).
The deubiquitinating enzyme USP24's role in bone formation and pathological ossification is not well understood.

Purpose of the Study:

To investigate the role of USP24 in regulating osteoblast differentiation and ossification.
To explore the potential of USP24-STAT2 signaling as a therapeutic target for HO.

Main Methods:

Investigated USP24 expression in skeletal tissues and HO lesions.
Utilized USP24 deficiency models and recombinant adeno-associated virus (rAAV)-mediated gene silencing in a fibrodysplasia ossificans progressiva (FOP) mouse model.
Assessed osteoblast differentiation, STAT2 stabilization, and bone morphogenetic protein (BMP) signaling pathways.

Main Results:

USP24 is highly expressed in skeletal tissues and promotes osteoblast development by stabilizing STAT2 via deubiquitination.
Loss of USP24 or STAT2 impairs osteoblast differentiation and bone formation.
USP24 and STAT2 are upregulated in HO lesions, and USP24 inhibition reduces HO pathogenesis in an FOP mouse model.
USP24 deficiency attenuates activin A-induced BMP signaling and osteogenesis.

Conclusions:

USP24 is a key regulator of both physiological osteoblast differentiation and pathological heterotopic ossification.
The USP24-STAT2 signaling axis plays a critical role in controlling bone formation.
Targeting USP24-STAT2 signaling presents a potential therapeutic strategy for treating pathological bone formation, including HO.