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Increased intracortical bone remodeling during lactation in beagle dogs
E G Vajda1, M Kneissel, B Muggenburg
1Radiobiology Division, School of Medicine, University of Utah, Salt Lake City, Department of Veterans Affairs Medical Center, Salt Lake City, Utah 84108, USA.
Biology of Reproduction
|November 26, 1999
Summary
Lactation significantly increases intracortical bone remodeling and turnover in dogs, particularly in rib and femur cortical bone. This bone adaptation may support maternal calcium needs during nursing.
Area of Science:
- Bone Biology
- Skeletal Metabolism
- Reproductive Physiology
Background:
- Pregnancy and lactation induce significant skeletal and mineral metabolism changes.
- Understanding bone's response to lactation is crucial for maternal health.
Purpose of the Study:
- To investigate alterations in intracortical bone remodeling and turnover during lactation in beagle dogs.
- To compare bone remodeling in lactating versus non-lactating control dogs.
Main Methods:
- Femur and rib samples were collected from beagle dogs at the end of lactation or post-weaning.
- Samples were compared to those from non-lactating control dogs.
- Intracortical bone remodeling and turnover markers were analyzed.
Main Results:
- Rib cortical bone exhibited higher turnover rates than femoral cortical bone.
- Lactation increased single-labeled osteons and resorption spaces in both femur and rib.
- Femoral cortical bone showed increased mineral apposition rate, activation frequency, and turnover in lactating dogs.
Conclusions:
- Lactation stimulates intracortical bone remodeling, potentially aiding maternal calcium demands.
- Increased bone turnover during lactation may explain transient decreases in bone mineral density observed in humans.