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Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

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Published on: July 3, 2020

Genetic hypercalciuric stone-forming rats have a primary decrease in BMD and strength.

Marc Grynpas¹, Stephen Waldman, Douglas Holmyard

¹Laboratory Medicine and Pathobiology Department, University of Toronto, Ontario, Canada.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research

|March 5, 2009

Summary

This summary is machine-generated.

Genetic hypercalciuric stone-forming rats fed a high calcium diet exhibit reduced bone mineral density (BMD) and impaired bone quality, suggesting an intrinsic bone disorder in kidney stone patients.

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Area of Science:

Nephrology
Orthopedics
Metabolic Bone Disease

Background:

Reduced bone mineral density (BMD) is common in kidney stone patients.
The cause of decreased BMD, whether primary bone disorder or dietary factors, remains unclear.

Purpose of the Study:

To investigate the independent effects of hypercalciuria on bone metabolism and quality.
To differentiate between dietary influences and intrinsic bone defects in genetic hypercalciuric stone-forming (GHS) rats.

Main Methods:

GHS rats and control (Ctl) rats were fed either a low calcium diet (LCD) or a high calcium diet (HCD) for 6 weeks.
Urine calcium levels, BMD, bone structure, and mechanical properties of cortical and trabecular bone were analyzed.

Main Results:

GHS rats consistently showed higher urine calcium excretion.
GHS rats on HCD had reduced cortical and vertebral BMD, decreased trabecular volume/thickness, and altered mechanical properties (more brittle).
GHS rats on LCD showed increased osteoid surface/volume, indicating impaired bone mineralization.

Conclusions:

GHS rats on an ample calcium diet demonstrate reduced BMD and compromised bone quality, indicative of an intrinsic bone disorder.
Dietary calcium levels modulate bone changes but do not cause the primary defect observed in GHS rats.
Findings suggest that hypercalciuria contributes to bone fragility independent of dietary calcium intake.