Abstract
We examined the effect of ATP on hypoxia-induced injury in freshly isolated rat renal proximal tubules and compared it with the effects of stable ATP analogues and ATP degradation products. Extracellular ATP significantly reduced hypoxia-induced structural cell damage (lactate dehydrogenase release). P(2)-receptor agonistic ATP analogues, including 2'-methylthio-ATP (2-Me-S-ATP), were also protective. In contrast, the P(1)-agonistic degradation products AMP and adenosine were not protective. Hypoxia-induced functional cell damage (loss of cellular potassium) was not changed by ATP or 2-Me-S-ATP. We therefore conclude that the protective property of ATP is not based on an effect of the degradation products or on a direct effect on cellular energy metabolism. The data indicate that the protective effect of ATP is mediated by P(2) receptors.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adenosine / pharmacology
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Adenosine Diphosphate / analogs & derivatives*
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Adenosine Diphosphate / pharmacology
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Adenosine Monophosphate / pharmacology
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Adenosine Triphosphate / analogs & derivatives*
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Adenosine Triphosphate / metabolism
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Adenosine Triphosphate / pharmacology*
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Animals
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Energy Metabolism / drug effects
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Hemolysis
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Hypotonic Solutions
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Hypoxia / metabolism*
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Kidney Tubules, Proximal / drug effects*
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Kidney Tubules, Proximal / metabolism*
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Kinetics
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L-Lactate Dehydrogenase / metabolism
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Male
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Potassium / metabolism
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Quinazolines / pharmacology
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Rats
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Rats, Sprague-Dawley
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Receptors, Purinergic P2 / physiology*
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Thionucleotides / pharmacology
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Triazoles / pharmacology
Substances
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Hypotonic Solutions
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Quinazolines
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Receptors, Purinergic P2
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Thionucleotides
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Triazoles
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adenosine 5'-O-(2-thiodiphosphate)
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adenosine 5'-O-(3-thiotriphosphate)
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Adenosine Monophosphate
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Adenosine Diphosphate
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Adenosine Triphosphate
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L-Lactate Dehydrogenase
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Adenosine
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Potassium
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2-methylthio-ATP
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9-chloro-2-(2-furyl)-(1,2,4)triazolo(1,5-c)quinazolin-5-imine