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Adaptation of opossum kidney cells to luminal phosphate: effects of phosphonoformic acid and kinase inhibitors


Thomas, Linto; Wagner, Carsten A; Biber, Jürg; Hernando, Nati (2016). Adaptation of opossum kidney cells to luminal phosphate: effects of phosphonoformic acid and kinase inhibitors. Kidney & Blood Pressure Research, 41(3):298-310.

Abstract

BACKGROUND/AIMS: Renal reabsorption of inorganic phosphate (Pi) is mediated by SLC34 and SLC20 Na+/Pi-cotransporters the abundance of which is under hormonal control. Extracellular Pi itself also regulates the expression of cotransporters and the concentration of Pi-regulating hormones, though the signaling pathways are largely unknown. Here, we explored the mechanisms that allow renal proximal cells to adapt to changes in the concentration of Pi.
METHODS: opossum kidney (OK) cells, a model of proximal epithelia, were incubated with different concentrations of Pi in the absence/presence of phosphonoformic acid (PFA), a Pi-analogue and SLC34-inhibitor, and of inhibitors of kinases involved in hormonal control of Pi-homeostasis; cells cultured in normal media were treated with uncouplers of oxidative phosphorylation. Then, the intracellular concentration of ATP and/or the Pi-transport capacity of the cultures were analyzed.
RESULTS: luminal Pi regulates the Pi-transport and the intracellular ATP levels. Changes in ATP seem secondary to alterations in Pi-transport, rather than ATP acting as a signal. Adaptation of Pi-transport to high Pi was not mimicked by PFA. Transport adaptation was blocked by PFA but not by kinase inhibitors.
CONCLUSIONS: in OK cells, adaptation of Pi-transport to luminal Pi does not depend on the same signaling pathways involved in hormonal regulation.

Abstract

BACKGROUND/AIMS: Renal reabsorption of inorganic phosphate (Pi) is mediated by SLC34 and SLC20 Na+/Pi-cotransporters the abundance of which is under hormonal control. Extracellular Pi itself also regulates the expression of cotransporters and the concentration of Pi-regulating hormones, though the signaling pathways are largely unknown. Here, we explored the mechanisms that allow renal proximal cells to adapt to changes in the concentration of Pi.
METHODS: opossum kidney (OK) cells, a model of proximal epithelia, were incubated with different concentrations of Pi in the absence/presence of phosphonoformic acid (PFA), a Pi-analogue and SLC34-inhibitor, and of inhibitors of kinases involved in hormonal control of Pi-homeostasis; cells cultured in normal media were treated with uncouplers of oxidative phosphorylation. Then, the intracellular concentration of ATP and/or the Pi-transport capacity of the cultures were analyzed.
RESULTS: luminal Pi regulates the Pi-transport and the intracellular ATP levels. Changes in ATP seem secondary to alterations in Pi-transport, rather than ATP acting as a signal. Adaptation of Pi-transport to high Pi was not mimicked by PFA. Transport adaptation was blocked by PFA but not by kinase inhibitors.
CONCLUSIONS: in OK cells, adaptation of Pi-transport to luminal Pi does not depend on the same signaling pathways involved in hormonal regulation.

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Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Physiology
07 Faculty of Science > Institute of Physiology
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2016
Deposited On:27 Jul 2016 08:44
Last Modified:21 Nov 2017 18:33
Publisher:Karger
ISSN:1420-4096
Additional Information:The final, published version of this article is available at http://www.karger.com/?doi=10.1159/000443432
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1159/000443432
PubMed ID:27165344

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