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P2Y2 receptor desensitization on single endothelial cells.

Priscila Sanabria¹, Elizabeth Ross, Edgardo Ramirez

¹Department of Physiology, Universidad Central del Caribe, Bayamon, Puerto Rico.

Endothelium : Journal of Endothelial Cell Research

|June 24, 2008

Summary

P2Y(2) receptor desensitization varies between microvascular and large vessel endothelial cells. This suggests different mechanisms controlling extracellular nucleotide signaling in various blood vessel types.

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Area of Science:

Cell biology
Physiology
Pharmacology

Background:

Receptor desensitization is a key regulatory process affecting cellular responses.
The P2Y(2) receptor, activated by extracellular nucleotides, is found in vascular endothelium.
Endothelial cells encounter extracellular nucleotides from damaged cells and platelets.

Purpose of the Study:

To compare P2Y(2) receptor desensitization in microvascular (bovine retinal) and large vessel (human umbilical vein) endothelial cells.
To investigate differences in the kinetics and concentration dependence of P2Y(2) receptor desensitization.

Main Methods:

Utilized fura-2 microfluorometry to monitor intracellular calcium changes in single endothelial cells.
Stimulated cells with uridine triphosphate (UTP) to induce P2Y(2) receptor activation and desensitization.

Main Results:

Both bovine retinal and human umbilical vein endothelial cells showed P2Y(2) receptor desensitization upon UTP stimulation.
Significant differences were observed in the rate, agonist concentration dependence, and maximal desensitization percentage between the two cell types.
Microvascular and large vessel endothelial cells exhibit distinct P2Y(2) receptor desensitization profiles.

Conclusions:

P2Y(2) receptor desensitization mechanisms differ between microvascular and large vessel endothelial cells.
This heterogeneity suggests variations in extracellular nucleotide signaling based on vascular bed origin.
Findings imply differential regulation of endothelial cell function by nucleotides in different vascular environments.