In VitroEffects of Parathyroid Hormone on Kidney Cortical Slices: cAMP Responses and Concomitant Inhibition of the Na⁺Gradient-Dependent Uptake of Phosphate by Brush Border Membrane Vesicles Isolated from the Renal Slices

Mouse renal cortical slices were incubated with parathyroid hormone (30 U/ml) for 2 min. Brush border membrane vesicles isolated from the treated slices had a decreased Na+ gradient-dependent uptake of phosphate. Concomitantly, the hormone elicited the activation of adenylate cyclase, the increase in tissue level of cAMP, and the enhancement of cAMP-dependent protein kinase.