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Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
Published on: July 3, 2020
TIEG-null mice display an osteopenic gender-specific phenotype
J R Hawse1, U T Iwaniec, S F Bensamoun
1Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, 200 First Street SW, Rochester, MN 55905, USA.
Bone
|April 9, 2008
Summary
TGFbeta inducible early gene-1 (TIEG) deficiency causes osteopenia in female mice by reducing bone formation. TIEG(-/-) female mice exhibit decreased bone mineral density and strength, impacting osteoblast function.
Area of Science:
- Skeletal Biology
- Molecular Endocrinology
- Bone Physiology
Background:
- TGFbeta inducible early gene-1 (TIEG) is crucial for osteoblast (OB) function and skeletal development.
- Understanding TIEG's role is vital for skeletal health research.
Purpose of the Study:
- To investigate the skeletal role of TIEG by generating and analyzing TIEG-null (TIEG(-/-)) mice.
- To characterize the bone phenotype of TIEG(-/-) mice in a pure C57BL/6 background.
Main Methods:
- Generation of congenic TIEG(-/-) mice.
- Dual-energy X-ray absorptiometry (DXA) and peripheral quantitative computed tomography (pQCT) analysis.
- Mechanical 3-point bending tests, micro-CT, and histomorphometric analyses.
Main Results:
- Female TIEG(-/-) mice showed decreased bone mineral content, density, and area in femurs and tibias compared to wild-type (WT) littermates.
- Reduced femur strength and increased flexibility were observed in female TIEG(-/-) mice.
- Histomorphometry revealed decreased cancellous bone area, reduced trabecular number, and a 42% decrease in bone formation rate in female TIEG(-/-) mice.
Conclusions:
- TIEG deficiency leads to osteopenia in female mice, primarily due to reduced bone formation.
- The findings highlight TIEG's critical role in maintaining bone mass and strength in females.
- Reduced functional/mature osteoblast numbers contribute to the observed osteopenic phenotype.
