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Related Experiment Video

Updated: May 19, 2026

Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
08:46

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Published on: September 1, 2015

High phosphate directly affects endothelial function by downregulating annexin II.

Giovana Seno Di Marco1, Maximilian König, Christian Stock

  • 1Department of Internal Medicine D, University of Münster, Münster, Germany.

Kidney International
|August 24, 2012
PubMed
Summary
This summary is machine-generated.

High phosphate levels impair endothelial function and blood vessel formation, increasing cardiovascular risk. This study links phosphate to adverse cardiovascular outcomes by affecting endothelial cells and annexin II.

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Area of Science:

  • Cardiovascular Biology
  • Endothelial Cell Biology
  • Renal Disease Pathophysiology

Background:

  • Hyperphosphatemia is a known risk factor for cardiovascular events in patients with and without renal disease.
  • The precise mechanisms by which high phosphate contributes to cardiovascular pathophysiology remain incompletely understood.
  • Endothelial dysfunction is a critical component in the development of cardiovascular disease.

Purpose of the Study:

  • To investigate the role of high phosphate in endothelial dysfunction and its impact on microvascular function and angiogenesis.
  • To explore the relationship between phosphate levels, annexin II expression, and endothelial cell behavior.
  • To determine if high phosphate directly affects endothelial cell structure and function, contributing to cardiovascular events.

Main Methods:

  • Analysis of protein expression (annexin II) in human coronary artery endothelial cells and EAhy926 cells exposed to high phosphate media or patient sera.
  • In vitro endothelial cell-based assays (angiogenesis, migration, capillary tube formation, survival) and in vivo chicken chorioallantoic membrane assay.
  • Assessment of endothelial cell stiffness in vitro and in vivo (rats) using high phosphate exposure.
  • Experimental blockade of membrane-bound extracellular annexin II using a specific antibody.

Main Results:

  • High phosphate exposure led to downregulation of annexin II and increased shedding of annexin II-positive microparticles in endothelial cells.
  • A negative correlation was observed between serum phosphate levels and annexin II expression.
  • In vitro and in vivo assays demonstrated impaired angiogenesis, altered vessel wall morphology, reduced endothelial cell migration, decreased capillary tube formation, and compromised endothelial survival under hyperphosphatemic conditions.
  • High phosphate exposure increased endothelial cell stiffness both in vitro and in rats.
  • Antibody-mediated blockade of annexin II mimicked the detrimental effects of high phosphate on endothelial cells.

Conclusions:

  • Phosphate directly interferes with endothelial function, impairing microvascular integrity and angiogenesis.
  • Downregulation and altered shedding of annexin II are key mechanisms by which high phosphate affects endothelial cells.
  • High phosphate-induced endothelial cell stiffening contributes to adverse cardiovascular outcomes.
  • These findings establish a direct link between phosphate levels and endothelial dysfunction, relevant to both healthy individuals and patients with renal disease, highlighting phosphate as a critical factor in cardiovascular event pathophysiology.