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Distinctive features of dietary phosphate supply
Anna Landsman1, David Lichtstein, Asher Ilani
1Dept. of Physiology, The Hebrew Univ., Hadassah Medical School, P.O.B. 12272, Jerusalem, Israel, 91120.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|May 28, 2005
Summary
Dietary phosphate influences appetite, specific organ growth (liver, fat), and kidney function. Intestinal factors responding to phosphate load may regulate these processes.
Area of Science:
- Physiology
- Nutrition Science
- Renal Physiology
Background:
- Dietary phosphate significantly impacts animal growth and kidney function.
- Previous research suggested intestinal signals mediate phosphate's effects on growth and food intake.
Purpose of the Study:
- To investigate dietary phosphate's role in regulating food intake, appetite, and organ-specific growth.
- To identify potential serum factors influencing renal phosphate handling in rats.
Main Methods:
- Rats were fed identical low-phosphate diets, with water supplemented by either phosphate or chloride.
- Evaluated changes in food intake, digestive system distention, organ growth (liver, epididymal fat), and serum effects on renal cells.
Main Results:
- Phosphate intake correlated with digestive system distention, indicating a direct effect on appetite.
- Dietary phosphate specifically promoted growth in the liver and epididymal fat.
- Serum from phosphate-supplemented rats inhibited sodium-dependent phosphate transport in kidney proximal tubule cells.
Conclusions:
- Dietary phosphate directly influences appetite and specific organ growth.
- A serum factor present in phosphate-fed rats can inhibit renal phosphate reabsorption.
- Findings support the hypothesis that digestive system factors mediate phosphate's effects on growth, appetite, and renal handling.