Abstract
Phosphate is predominantely reabsorbed in the proximal tubule (1, 2) and this reabsorption is inhibited by parathyroid hormone (PTH) (3, 4). However, in both normal and TPTX animals, phosphate delivery beyond the point of micropuncture in the late proximal tubule exceeds that excreted in the urine (3–11). Furthermore, most investigators report an increase in delivery of phosphate from the proximal tubule but only a moderate phosphaturia after saline expansion in TPTX animals (3, 4, 6, 11). This blunting of the saline induced phosphaturia in TPTX animals has been interpreted as evidence for distal phosphate reabsorption. Similarly, the phosphaturia induced by acetazolamide is also blunted in TPTX animals. From these studies it was concluded that PTH, although it has effects similar to acetazolamide on the proximal tubule, also has a more distal site of action (10, 12). Since these latter conclusions were derived from micropuncture studies where only proximal tubules were punctured, the site of altered phosphate reabsorption could be in any segment beyond the point of micropuncture.
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References
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Knox, F.G., Greger, R.F., Lang, F.C., Marchand, G.R. (1977). Renal Handling of Phosphate: Update. In: Massry, S.G., Ritz, E. (eds) Phosphate Metabolism. Advances in Experimental Medicine and Biology, vol 81. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-4217-5_1
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DOI: https://doi.org/10.1007/978-1-4613-4217-5_1
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