Defective parathyroid hormone regulation of NHE3 activity and phosphate adaptation in cultured NHERF-1-/- renal proximal tubule cells

The Journal of Biological Chemistry
Rochelle CunninghamE J Weinman

Abstract

The present experiments using primary cultures of renal proximal tubule cells derived from wild-type and NHERF-1 knockout animals examines the regulation of NHE3 by phenylthiohydantoin (PTH) and the regulation of phosphate transport in response to alterations in the media content of phosphate. Forskolin (34.8 +/- 6.2%) and PTH (29.7 +/- 1.8%) inhibited NHE3 activity in wild-type proximal tubule cells but neither forskolin (-3.2 +/- 3.3%) nor PTH (-16.6 +/- 8.1%) inhibited NHE3 activity in NHERF-1(-/-) cells. Using adenovirus-mediated gene transfer, expression of NHERF-1 in NHERF-1(-/-) proximal tubule cells restored the inhibitory response to forskolin (28.2 +/- 3.0%) and PTH (33.2 +/- 3.9%). Compared with high phosphate media, incubation of wild-type cells in low phosphate media resulted in a 36.0 +/- 6.3% higher rate of sodium-dependent phosphate transport and a significant increase in the abundance of Npt2a and PDZK1. NHERF-1(-/-) cells, on the other hand, had lower rates of sodium-dependent phosphate uptake and low phosphate media did not stimulate phosphate transport. Npt2a expression was not affected by the phosphate content of the media in NHERF-1 null cells although low phosphate media up-regulated PDZK1 abundance. Prim...Continue Reading

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