RENAL TUBULAR LOCALIZATION OF PARATHYROID HORMONE INDUCED URINARY CYCLIC ADENOSINE 3′,5′-MONOPHOSPHATE

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Abstract
Stop-flow studies were done in three dogs before and after a parathyroid hormone (PTH) infusion. The urine cyclic adenosine 3′,5′-monophosphate (cyclic AMP) to inulin U/P ratios did not change during the control stop-flow but with PTH rose sharply and significantly in the proximal tubular samples. The rise in cyclic AMP to inulin U/P ratios was correlated with the fall in phosphorus concentration in the same samples. The PTH induced urinary cyclic AMP enters the tubular fluid in the same proximal area of the tubule in which PTH is known to affect phosphate reabsorption.

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