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J Appl Physiol 85: 301-309, 1998;
8750-7587/98 $5.00
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Vol. 85, Issue 1, 301-309, July 1998

Neuropeptide Y and Y1-receptor agonists increase blood flow through arteriovenous anastomoses in rat tail

Martha E. Heath

Thermal Stress/Adaptation, Naval Medical Research Institute, Bethesda, Maryland 20889-5607

The purpose of this study was to characterize neuropeptide Y (NPY)-induced vasodilation in the rat tail. Sterile surgical technique was used (with pentobarbital sodium anesthesia) to equip rats with a jugular catheter and a blind-ended thermocouple reentrant tube next to the carotid artery. Tail skin and core temperature were measured with thermocouples during experiments. Tail skin blood flow was monitored with a laser Doppler flowmeter, and tail total blood flow and volume were measured with plethysmography. After baseline data were collected, saline, NPY (16, 32, 64, and 128 µg/kg), [Leu31 Pro34]NPY (63.25 µg/kg), or NPY[13-36] (44.7 µg/kg) was administered intravenously. Tail total blood flow, volume, and tail skin temperature increased, whereas tail skin blood flow and core temperature decreased in response to both NPY- and the Y1-receptor agonist [Leu31 Pro34]NPY but not in response to saline or NPY[13-36]. Studies conducted with the use of color microspheres demonstrated that arteriovenous anastomoses are involved in this NPY-induced vasodilation.

neurotransmitter; vascular control; microspheres; thermal stress; laser Doppler flowmetry; venous occlusion plethysmography


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