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Intracellular alkalinization by phosphate uptake via type III sodium–phosphate cotransporter participates in high phosphate-induced mitochondrial oxidative stress and defective insulin secretion

Tuyet Nguyen, Xianglan Quan, Shanhua Xu, Ranjan Das, Seung-Kuy Cha, In Deok Kong, Minho Shong, Claes B Wollheim, Kyu-Sang Park

Abstract

ABSTRACT: Elevated plasma levels of inorganic phosphate (Pi) are harmful, causing, among other complications, vascular calcificationanddefective insulin secretion.Theunderlying molecularmechanismsof thesecomplications remain poorly understood.Wedemonstrated the role ofPi transport across theplasmalemmaonPi toxicity in INS-1Erat clonalb cells and rat pancreatic islet cells.Type III sodium–phosphate cotransporters (NaPi) are the predominant Pi transporters expressed in insulin-secreting cells. Transcript and protein levels of PiT-1 and -2, isotypes of type III NaPi, were upregulated by high Pi incubation. In patch-clamp experiments, extracellular Pi elicited a Na+-dependent, inwardly rectifying current, which was markedly reduced under acidic extracellular conditions. Cellular uptake of Pi elicited cytosolic alkalinization; intriguingly, this pH change facilitated Pi transport into the mitochondrial matrix. Increased mitochondrial Pi uptake accelerated superoxide generation, mitochondrial permeability transition, and endoplasmic reticulum stress-mediated translational attenuation, leading to reduced insulin content and impaired glucosestimulated insulin secretion. Silencing of PiT-1/-2 prevented Pi-induced superoxide generation andmPT, and restored insulin secretion. We propose that Pi transport across the plasma membrane and consequent cytosolic alkalinization could be a therapeutic target for protection from Pi toxicity in insulin-secreting cells, as well as in other cell types.—Nguyen, T. T., Quan, X., Xu, S.,Das, R., Cha, S.-K., Kong, I. D., Shong, M., Wollheim, C. B., Park,K.-S. Intracellular alkalinization by phosphate uptake via type III sodium–phosphate cotransporter participates in high phosphateinduced mitochondrial oxidative stress and defective insulin secretion. FASEB J. 30, 000–000 (2016). www.fasebj.org

 

KEY WORDS: inorganic phosphate • pancreatic b cells • mitochondrial permeability transition • endoplasmic reticulum stress • superoxide

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