Related Experiment Videos
Sequential histomorphometric changes in cancellous bone from ovariohysterectomized dogs.
R W Boyce1, A F Franks, M L Jankowsky
1Norwich Eaton Pharmaceuticals, Inc., A Procter and Gamble Company, NY.
Summary
The ovariohysterectomized dog model shows rapid, transient bone remodeling changes after ovarian function loss, but no significant bone volume reduction. This suggests a temporary skeletal response, not chronic bone loss.
Area of Science:
- Veterinary Medicine
- Bone Biology
- Endocrinology
Background:
- Ovarian insufficiency leads to bone loss, necessitating reliable animal models for research.
- The ovariohysterectomized (OVH) dog is a potential model for studying bone loss due to ovarian insufficiency.
Purpose of the Study:
- To characterize sequential histomorphometric changes in canine cancellous bone following ovariohysterectomy.
- To assess the utility of the OVH dog as an animal model for ovarian insufficiency-related bone loss.
Main Methods:
- 25 adult beagle dogs underwent ovariohysterectomy.
- Iliac bone biopsies were collected at surgery and at 1, 3, 6, and 10 months post-surgery.
- Static and dynamic histomorphometry was performed on undecalcified bone sections.
Main Results:
- Bone remodeling activated by 3 months post-OVH, with increased mineralizing surface and bone formation rate.
- This remodeling increase was transient; by 6 months, bone formation decreased below baseline.
- Reduced osteoblast function and increased eroded surface were observed by 6 months, with no significant bone volume loss detected throughout the study.
Conclusions:
- The OVH dog exhibits transient changes in cancellous bone remodeling after ovarian function loss.
- These findings support the OVH dog's utility as a model for transient skeletal responses to ovarian insufficiency.
- The model may be useful for evaluating short-term interventions, but does not replicate chronic bone loss conditions.