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Normophosphatemic phosphate depletion in growing rat
The American Journal of Physiology
|March 1, 1979
Summary
Phosphate depletion (PD) can occur even with normal phosphorus intake during accelerated growth. Bone minerals are mobilized to maintain soft tissue phosphorus levels, indicating adaptive mechanisms to high metabolic demand.
Area of Science:
- Nutritional biochemistry
- Mineral metabolism
- Physiology
Background:
- Phosphate depletion (PD) affects serum, urinary, bone, and soft tissue phosphorus levels.
- Understanding phosphorus homeostasis is crucial for metabolic health.
Purpose of the Study:
- To investigate the effects of varying phosphorus intake on growing rats.
- To determine the influence of phosphate depletion on mineral distribution.
Main Methods:
- Growing rats were fed high-phosphorus (HP), normal-phosphorus (NP), or low-phosphorus (LP) diets.
- Serum, urinary, bone, and soft tissue phosphorus and calcium levels were analyzed.
Main Results:
- LP diet led to growth arrest and biochemical signs of PD.
- NP rats exhibited accelerated growth and PD biochemical changes despite normophosphatemia.
- Bone phosphorus and calcium were reduced in LP and NP groups, indicating mineral mobilization.
- Soft tissue phosphorus remained constant across all groups, even during PD.
Conclusions:
- Physiologic adaptation to PD can occur in growing rats with high metabolic demand, even on a normal phosphorus diet.
- Normophosphatemia with evolving PD biochemical parameters suggests a sensitive dietary phosphorus sensing mechanism.