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P2y1 and hyperglycemia

Serap Gur, Philip J Kadowitz, Asim B Abdel-Mageed, Muammer Kendirci, Suresh C Sikka, Geoffrey Burnstock, Wayne J G Hellstrom
PURPOSE: We determined the role of purine and pyrimidine nucleotides in erectile function in diabetic rats. MATERIALS AND METHODS: A total of 60 adult male rats were divided into 2 groups, including 30 controls and 30 treated with streptozotocin (60 mg/kg) for 8 weeks to induce hyperglycemia. Changes in intracavernous pressure after intracrural injections of adenosine 5'triphosphate and adenosine 5'triphosphate analogues in control and diabetic rats, and the relaxant response to electrical field stimulation of precontracted corpus cavernosum smooth muscle in organ baths were investigated...
May 2009: Journal of Urology
Cleide Gonçalves da Silva, Robert Jarzyna, Anke Specht, Elzbieta Kaczmarek
AMP-activated protein kinase (AMPK) plays a key role in the regulation of energy homeostasis and is activated in response to cellular stress, including hypoxia/ischemia and hyperglycemia. The stress events are accompanied by rapid release of extracellular nucleotides from damaged tissues or activated endothelial cells (EC) and platelets. We demonstrate that extracellular nucleotides (ATP, ADP, and UTP, but not UDP) and adenosine independently induce phosphorylation and activation of AMPK in human umbilical vein EC (HUVEC) by the mechanism that is not linked to changes in AMP:ATP ratio...
March 17, 2006: Circulation Research
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