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Acta Physiologica Congress

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Acta Physiologica 2011; Volume 201, Supplement 682
The 90th Annual Meeting of The German Physiological Society
3/26/2011-3/29/2011
Regensburg, Germany


G-PROTEIN COUPLED RECEPTORS SERVE AS MECHANOSENSORY ELEMENTS TO DETERMINE ARTERIAL MYOGENIC TONE
Abstract number: P074

*Schneider1 H., Blodow1 S., Wizemann1 R., Storch1 U., Gudermann1 T., Mederos y Schnitzler1 M.

Arterial myogenic tone and subsequent constriction of blood vessels develop as an intrinsic reaction of resistance arteries to elevated intraluminal blood pressure. The molecular identity of the mechanosensory elements is still elusive. Recent studies at the cellular level suggest a sensory function for a subgroup of G-protein coupled receptors (GPCRs) coupling to Gq/11-proteins. By determining RNA-levels of individual GPCRs in functional pairs of large and small vessels, we could identify an array of Gq/11-coupled receptors such as angiotensin II AT1B, vasopressin V1A and endothelin ETA receptors significantly enriched in resistance vessels. Furthermore, we show that pharmacological blockade of those receptors by different antagonists and inverse agonists attenuated myogenic tone as measured in isolated murine mesenteric arteries ex vivo. These findings suggest that GPCRs play an important role for wall strain homeostasis by sensing mechanical stress.

To cite this abstract, please use the following information:
Acta Physiologica 2011; Volume 201, Supplement 682 :P074

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