Phosphate and Endothelial Function: How Sensing of Elevated Inorganic Phosphate Concentration Generates Signals in...

Area of Science:

• Cellular Biology
• Physiology
• Biochemistry

Background:

• Inorganic phosphate (Pi) is vital for cellular functions like energy homeostasis and metabolism.
• Excessive extracellular Pi can cause adverse cellular effects, particularly in endothelial cells.
• Elevated Pi is linked to cardiovascular issues, even at the upper end of normal plasma concentrations.

Purpose of the Study:

• To review the functional effects of elevated extracellular Pi on mammalian cells and tissues.
• To examine the cardiovascular impacts of increased Pi, focusing on endothelial dysfunction.
• To describe Pi transport, sensing mechanisms, and functional consequences in mammalian cells.

Main Methods:

• In vitro and in vivo studies on mammalian cells and tissues.
• Review of existing literature on inorganic phosphate effects.
• Analysis of cardiovascular sites of action and endothelial dysfunction.

Main Results:

• Elevated extracellular Pi affects cellular processes and causes adverse effects, especially in endothelial cells.
• Cardiovascular effects are observed in vivo, even within the upper normal range of plasma Pi.
• Soluble Pi plays a role in endothelial dysfunction.

Conclusions:

• Pi concentration is tightly regulated by transporter proteins.
• Mammalian cells possess mechanisms to sense Pi changes and trigger functional responses.
• Understanding Pi's role is crucial for cellular and cardiovascular health.