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Hypophosphatemia in infant and adult spontaneously hypertensive rats
Insights
Spontaneously hypertensive rats show lower serum inorganic phosphate levels compared to normotensive controls. This early hypophosphatemia may be linked to parathyroid hormone and explain how calcium affects hypertension.
Area of Science:
- Physiology
- Endocrinology
- Cardiovascular Research
Background:
- Spontaneously hypertensive rats (SHR) are a common model for studying hypertension.
- Serum inorganic phosphate levels and their relationship with blood pressure regulation are not fully understood.
- Parathyroid hormone (PTH) plays a role in phosphate homeostasis.
Purpose of the Study:
- To investigate serum inorganic phosphate concentrations in Spontaneously hypertensive rats (SHR) compared to normotensive controls.
- To explore the developmental changes in serum phosphate during early postnatal life in relation to blood pressure.
- To examine the potential role of hypophosphatemia and parathyroid hormone in hypertension.
Main Methods:
- Measurement of serum inorganic phosphate concentrations in SHR, Sprague Dawley (CD), and Wistar Kyoto (WKY) rats from newborn to three months of age.
- Monitoring of blood pressure development in all rat strains.
- Analysis of potential correlations between serum phosphate, parathyroid hormone levels, and blood pressure.
Main Results:
- SHR exhibited significantly lower serum inorganic phosphate concentrations compared to control strains (CD and WKY) across the study period.
- Serum inorganic phosphate increased and plateaued from 8-12 weeks in all strains, coinciding with rising blood pressure.
- Prehypertensive SHR showed hypophosphatemia, potentially linked to elevated parathyroid hormone levels.
Conclusions:
- Early-onset hypophosphatemia is a characteristic of Spontaneously hypertensive rats.
- Elevated parathyroid hormone levels in SHR may contribute to hypophosphatemia.
- The observed hypophosphatemia might explain the beneficial effects of high calcium diets in this hypertensive model.
Abstract:
Spontaneously hypertensive rats (SHR) newborn to three months of age exhibit significantly lower serum inorganic phosphate concentrations than do controls from two normotensive strains, Sprague Dawley (CD) and Wistar Kyoto (WKY). During early postnatal development serum inorganic phosphate increases in all strains and plateaus from eight to twelve weeks. This rise in serum phosphate occurs during a period when blood pressure is increasing in normotensive strains as well as in SHR. Hypophosphatemia even in prehypertensive SHR may relate to elevated parathyroid hormone levels in SHR and may explain the salutary effects of high calcium diets in this hypertensive model.