Novel Phosphate-activated Macrophages Prevent Ectopic Calcification by Increasing Extracellular ATP and Pyrophosphate

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2017 Apr 1

PMID 28362852

Citations 19

Authors

Ricardo Villa-Bellosta

Magda R Hamczyk

Vicente Andres

Affiliations

Soon will be listed here.

Abstract

Purpose: Phosphorus is an essential nutrient involved in many pathobiological processes. Less than 1% of phosphorus is found in extracellular fluids as inorganic phosphate ion (Pi) in solution. High serum Pi level promotes ectopic calcification in many tissues, including blood vessels. Here, we studied the effect of elevated Pi concentration on macrophage polarization and calcification. Macrophages, present in virtually all tissues, play key roles in health and disease and display remarkable plasticity, being able to change their physiology in response to environmental cues.

Methods And Results: High-throughput transcriptomic analysis and functional studies demonstrated that Pi induces unpolarized macrophages to adopt a phenotype closely resembling that of alternatively-activated M2 macrophages, as revealed by arginine hydrolysis and energetic and antioxidant profiles. Pi-induced macrophages showed an anti-calcifying action mediated by increased availability of extracellular ATP and pyrophosphate.

Conclusion: We conclude that the ability of Pi-activated macrophages to prevent calcium-phosphate deposition is a compensatory mechanism protecting tissues from hyperphosphatemia-induced pathologic calcification.

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