Endothelin-1 contributes to normocapnic hyperoxic pial artery vasoconstriction |
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Authors: | William M Armstead |
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Institution: | Departments of Anesthesia and Pharmacology, University of Pennsylvania and The Children's Hospital of Philadelphia, 34th and Civic Center Blvd., Philadelphia, PA 19104, USA. |
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Abstract: | The present study was designed to determine if hyperoxia elicits pial artery vasoconstriction and to characterize the contribution of endothelin-1 (ET-1) to that vascular response in newborn pigs equipped with a closed cranial window. Hyperoxic conditions were established by ventilating the piglets with 100% O(2) during normocapnia and concomitantly topically applying artificial CSF that had been bubbled with 100% O(2). Hyperoxia elevated CSF ET-1 from 23+/-1 to 45+/-4 pg/ml. Hyperoxia also elicited pial artery vasoconstriction that was attenuated by BQ123 (10(-6) M), an ET-1 antagonist (-15+/-1 vs. -5+/-1%). These data indicate that ET-1 contributes to hyperoxic pial artery vasoconstriction. |
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Keywords: | Newborn Cerebral circulation Hyperoxia Endothelin |
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