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THE EFFECTS OF PARATHORMONE AND AMMONIUM CHLORIDE ON THE BONES OF RABBITS
H L Jaffe1, A Bodansky, J E Blair
1Laboratory Division of the Hospital for Joint Diseases, New York.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Young rabbits showed rapid bone decalcification from a large parathormone dose. However, rabbits are resistant to chronic hyperparathyroidism effects, making them unsuitable for studying these bone changes.
Area of Science:
- Endocrinology
- Bone Biology
- Comparative Physiology
Background:
- Parathormone (PTH) plays a crucial role in calcium and phosphate homeostasis.
- Understanding PTH's effects on bone is vital for metabolic bone disease research.
- Previous studies indicated PTH's osteolytic potential in various species.
Purpose of the Study:
- To investigate the effects of parathormone on rabbit bone.
- To assess the rabbit's suitability as a model for studying chronic hyperparathyroidism.
- To evaluate the impact of ammonium chloride and calcium lactate on parathormone-induced bone changes.
Main Methods:
- Administration of a single large dose of parathormone to young rabbits.
- Administration of gradually increasing doses of parathormone to young and adult rabbits.
- Concurrent administration of ammonium chloride or calcium lactate with parathormone.
- Histological examination of bone tissue.
Main Results:
- A single large parathormone dose caused rapid, extensive bone decalcification in young rabbits.
- Gradually increased parathormone doses did not induce significant bone changes in young or adult rabbits.
- Ammonium chloride and calcium lactate treatments did not alter parathormone's effects or cause adverse effects like metastatic calcification.
Conclusions:
- Rabbits exhibit significant resistance to the chronic decalcifying effects of parathormone.
- The rabbit is not an ideal model for studying chronic hyperparathyroidism bone disease.
- Observed bone changes in young rabbits differ from severe fibrous processes seen in other species.
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